Tag: siem (Page 1 of 3)

Alienvault: Working with Decoders and Rules

When we started out with Alienvault years ago, they were just a smallish, start up company and we worked directly almost with the engineers and sales team in Cork. Of course, a lot has changed since AT&T took over, but during the early days, there were a lot of knowledge and mindshare done directly between us and them. So much so that if you were to check their partner site, they still list us as the only Malaysian company as their reseller, due to the early days of listing. What attracted us to the product was that we could lift the hood and see what was underneath. Alienvault (or OSSIM) was previously a hodgepodge of many working parts that were glued together and somehow made to work. The agent was a product called OSSEC, which is an open-source HIDS. The IDS is Suricata/Snort and if you look closely at the availability tool, you would see the backend is a Nagios running. NFSen is used for their netflow data display, and PRADS for their asset discovery. OPENVAS is their vulnerability scanner and best of all, they allow you to jailbreak the system and go into the OS itself and do what you need to do. In fact, most of the time, we are more comfortable on the command line than through the actual UI itself.

The history aside, the downside of adding in these different applications and getting them all to play nice together, is that you would have to understand the interworkings of these pieces.

For instance, if you were to send logs via Syslog to Alienvault, you would have to know that the daemon rsyslog (not an Alienvault product) is the one being used to receive these logs. If you were to use the agent, then the application receiving these logs is different – it’s the OSSEC server that receives it. So it depends how logs come in, and from there you can decide what you wish to do with it.

The challenge is oftentimes to filter and ‘massage’ the logs when it hits Alienvault. There are a few approaches to this:

The basics are at stage 1 where the client (server, workstation etc) send logs (or have logs to be collected) to Alienvault. The initial filtering should theoretically happen here if possible. Many applications have the capability to control their logs – Windows server being one of them. Turning on debug logs on Linux for instance would cause a fair bit of log traffic across the network. Applications as well, have options of what to log and what not to log. We see firewalls logging traffic logs, proxies logging every single connection that goes through – this causes loads of logs hitting the Alienvault.

AV (especially the All In Ones) isn’t designed to take on heavy loads the way Splunk or other enterprise SIEM like ArcSight, that chews through 100,000 EPS like Galactus chews through planets. The AV approach has always been, we aren’t a SIEM only, we are a unified security management system, so security logs are what we are after. Correlation is what we are after. APT are what we are after. Their philosophy isn’t to overload and do generic Business Intelligence with millions of log lines, but to focus on Security and what is happening to your network. That being said, it’s no pushover as well, being able to work with 90 – 120 million events and going through 15,000 EPS on their enterprise.

The reality however is that most clients just turn on logs at Item 1 and plow these logs over to Alienvault. So it’s really up to Alienvault to start filtering these logs and stopping them coming in. At layer 2, is what we call the outer layer. This is the front line defence against these attacks of logs. These are where the engine running these log systems (OSSEC, rsyslog etc) can filter out and then trickle what is needed to Alienvault main engine itself in Layer 3. The AV main engine also has its form of defence, in policies, where we can create ‘junk’ policies to simply ignore logs coming in and not process them through the resource intensive risk assessment calculations.

So, we are going to assume that Layer 1 filtering wasn’t done. What we are going to look at is sorting out Layer 2 and we will assume that logs are coming in via OSSEC. We will have another article on Rsyslog filtering because that is a whole different novel to write.

When it hits OSSEC, it’s going via default port 1514/udp. Now remember, when logs first enters Alienvault, it doesn’t immediately go into the SIEM event display. It first needs to be logged, before it can be turned into events, before it can trigger alarms. So the basic rule is to get it logged:

Make sure you are receiving logs first.

This may seem juvenile in terms of understanding but we have been through enough to know that no matter WHAT the client says, oftentimes, their systems are not even sending the logs to us! A simple tcpdump -Xni eth0 “udp port 1514” will see if the logs are getting in, so go ahead with that first to ensure you are receiving. Just add a “and host <ip address>” if you need to filter it by the IP address.

Another way that Alienvault allows, when you are getting logs via HIDS/OSSEC is by enabling the “logall” on USM HIDS configuration, which we covered in the previous articles here. But be aware turning on logall potentially will bring a lot of logs and information into the box so we generally avoid this unless it’s really needed.

Once you are seeing logs coming into Alienvault, for OSSEC at least the next thing to do is to move these logs to “alerts.log” and from there, Alienvault can start putting it into the SIEM display.

For this to happen, you need to understand 3 things here, aside from the fact that we are currently now working on layer 2 from the diagram above – OSSEC:

a) Decoders

b) Rules

c) /var/ossec/bin/ossec-logtest

The above are actually OSSEC terminologies – not strictly Alienvault. What this means is that if you were to decouple OSSEC from Alienvault, you can. You can just download OSSEC. Or you could download other products like Wazuh, which is also another product we carry. Wazuh runs OSSEC (its own flavor) but has a different presentation layer (Layer 3 in our diagram above) and integrates with ELK to provide a more enterprise ready product but the foundation came from the same OSSEC principles. So when we talk about Rules and Decoders and using the ossec-logtest script to test your stuff, it’s not an Alienvault specific talk. Alienvault specific talk we can go later with plugins and stuff. In the actual ACSE course from Alienvault (at least the one I passed 5 years ago), there is really no mention on decoders and rules – it basically just focus on the core Alienvault items only.

At this point, we need to make the decision on whether to have the filtering done on OSSEC level (2) or on Alienvault level (3)? As a rule, the closer the filtering is done to source, the better…however, in our opinion, the filtering by Alienvault plugins is a lot more flexible and intuitive in design, compared to OSSEC (and because we are biasedly trained in Alienvault, but not so much in OSSEC). So for this article (which is taking VERY long in getting to its point), we are tasked to simply funnel the logs into /var/ossec/logs/alerts/alerts.log because that is where OSSEC sends its logs to and where we can get our AV plugins to read from.

The logs in /var/ossec/logs/archives/archives.log (remember, we turned on the logall option in the OSSEC configuration for this illustration) aren’t monitored by plugins. Because in a production environment, you won’t have that turned on. So, once you have logs into the alerts.log file, you are good to go, because then you can sit down and write plugins for Alienvault to use in the SIEM display.

OK – Firstly Decoders. OSSEC has a bunch of default decoders (like plugins in Alienvault) that is able to interpret a whole bunch of logs coming in. Basically, the decoder is set up with Regular expression to go through a particular file and just grab the information from the file and drop it into fields like IP address, date, source IPs etc. Similar to the AV plugin, but for this illustration, we are not going to use much of the OSSEC filtering, but simply to ensure we select the right logs and send them over to the alerts.log file.

So ok, let’s take the previous article example of having MySQL logs into Alienvault. Let’s say we have this example query log coming into our Alienvault (archive.log, if we turned it on)

2021 Feb 21 00:46:05 (Host-192-168-1-62) 192.168.1.62->\MySQLLOG/db.log 2021-02-22T09:41:42.271529Z        28 Query     SHOW CREATE TABLE db.persons

So the above doesn’t really offer much, but you can technically see there is the date and time, and the command line etc and a decoder will need to be created to parse the incoming log.

Picking up from where we left off at the Alienvault link, Task 4 covers the steps to create the decoder:

a) Edit /var/ossec/alienvault/decoders/local_decoder.xml and add in the following:

<decoder name="mysql-query">
        <prematch> Query</prematch>
</decoder>
<decoder name="mysql-connect">
        <prematch> Connect\s*</prematch>
</decoder>
<decoder name="mysql-quit">
        <prematch> Quit</prematch>
</decoder>

The above is simplistic decoder to catch the 3 important events from the logs coming in from MySQL – Query log, i.e

2021-02-22T09:41:42.271529Z        28 Query     SHOW CREATE TABLE db.persons

Connect Log

2021-02-20T16:35:28.019734Z        8 Connect   root@localhost on  using SSL/TLS

Quit

2021-02-20T18:29:35.626687Z       13 Quit  

Now of course, for those aware, the Query logs have many different types of query – Query Use, Query Show, Query Select, Query Set, Query Insert, Query Update and so on. The idea of the decoder is simply to catch all the queries, and we will theoretically log all Queries into Alienvault.

Now, remember to tell Alienvault you have a new decoder file

In the USM Appliance web UI, go to Environment > Detection > HIDS > Config > Configuration.

Add <decoder>alienvault/decoders/local_decoder.xml</decoder> after <decoder> :

Adding the "local_decoder.xmll" setting to ossec_config

Adding this setting enables the usage of a custom decoder. Save it and restart HIDS.

So that’s it for the decoder.

Now, on the CLI, go to /var/ossec/bin and run ./ossec-logtest

Paste the following “2021-02-20T18:29:43.189931Z 15 Query SET NAMES utf8mb4”

And you should the get result as below

linux:/var/ossec/bin# ./ossec-logtest
2021/03/29 09:50:10 ossec-testrule: INFO: Reading decoder file alienvault/decoders/decoder.xml.
2021/03/29 09:50:10 ossec-testrule: INFO: Reading decoder file alienvault/decoders/local_decoder.xml.
2021/03/29 09:50:10 ossec-testrule: INFO: Started (pid: 25070).
ossec-testrule: Type one log per line.
2021-02-20T18:29:43.189931Z 15 Query SET NAMES utf8mb4
**Phase 1: Completed pre-decoding.
full event: '2021-02-20T18:29:43.189931Z 15 Query SET NAMES utf8mb4'
hostname: 'linux'
program_name: '(null)'
log: '2021-02-20T18:29:43.189931Z 15 Query SET NAMES utf8mb4'
**Phase 2: Completed decoding.
decoder: 'mysql-query'

So basically, any logs that come into archive.log that has that sample line “Query” you will be lumping it in as mysql-query decoded. Of course you can further refine it with Regular expression to get the exact term you wish, but for the illustration, we want to catch the queries here and it’s fine for now.

The next item is the rules. Again, referring to the Alienvault writeup above, go ahead and edit
/var/ossec/alienvault/rules/local_rules.xml.

What we will do is to add the following in

<group name="mysql-connect">
<rule id="192000" level="0">
<decoded_as>mysql-connect</decoded_as>
<description>Connect log is enabled</description>
</rule>

<rule id="192001" level="1">
<if_sid>192000</if_sid>
<regex>Connect\s*</regex>
<description>Connection is found</description>
</rule>
</group>


<group name="mysql-query">
<rule id="195000" level="0">
<decoded_as>mysql-query</decoded_as>
<description>Mysql Query log is enabled!</description>
</rule>


<rule id="195001" level="0">
<if_sid>195000</if_sid>
<match>SET</match>
<description>Query set is found and ignored!</description>
</rule>


<rule id="195002" level="1">
<if_sid>195000</if_sid>
<regex>Query\s*</regex>
<description>Query is found</description>
</rule>
</group>


<group name="mysql-quit">
<rule id="194000" level="0">
<decoded_as>mysql-quit</decoded_as>
<description> Quit log is enabled</description>
</rule>

<rule id="194001" level="1">
<if_sid>194000</if_sid>
<regex>Quit\s*</regex>
<description>Quit command is found</description>
</rule>
</group>

So what the above does is to decide what to do with 3 types of MySQL logs you are getting: Connect, Query and Quit. We want to dump these logs into alerts.log so that we can work on it with Alienvault’s plugin. We don’t want to do any fancy stuff here so it’s pretty straightforward.

Each of these 3 have a foundation rule

a) Connect – 192000

b) Quit – 194000

c) Query – 195000

Each rule has a nested rule to decide what to do with it. Notice you can actually do Regex or Match on the rules which really provides a lot of flexibility in filtering. In fact, if it wasn’t for Alienvault’s plugins, OSSEC’s filtering would probably be sufficient for most of your custom logs requirement.

For this illustration, our job is simple – for each of these rules, find out the key word in the log, and then escalate it to an alert. An alert is created when you create a rule ID with level = 1, i.e <rule id=”195002″ level=”1″>

If you run ossec-logtest again, and paste the log there, you would be able to see

**Phase 1: Completed pre-decoding.
full event: '2021 Feb 21 00:46:46 (Host-192-168-1-62) 192.168.1.62->\MySQLLOG/db.log 2021-02-22T09:42:21.711131Z 28 Quit'
hostname: '(Host-192-168-1-62)'
program_name: '(null)'
log: '192.168.1.62->\MySQLLOG/db.log 2021-02-22T09:42:21.711131Z 28 Quit'
**Phase 2: Completed decoding.
decoder: 'mysql-quit'
**Phase 3: Completed filtering (rules).
Rule id: '194001'
Level: '1'
Description: 'Quit command is found'
**Alert to be generated.

Once you see “alert to be generated” you will find that same alert in the /var/ossec/logs/alerts/alerts.log

AV - Alert - "1613881201" --> RID: "197011"; RL: "1"; RG: "connect"; RC: "Quit Command found"; USER: "None"; SRCIP: "None"; HOSTNAME: "(Host-192-168-1-62) 192.168.1.62->\MySQLLOG/db.log"; LOCATION: "(Host-192-168-1-62) 192.168.1.62->\MySQLLOG/db.log"; EVENT: "[INIT] 2021-02-22T09:42:21.711131Z        28 Quit       [END]";

From there, you can go about doing the plugins and getting it into the SIEM.

Whew. That’s it.

You would notice, however, there is another sub-rules in there for Query:

<rule id="195001" level="0">
<if_sid>195000</if_sid>
<match>SET</match>
<description>Query set is found and ignored!</description>
</rule>

This is set above the “alert” rule and you notice that this is Level=0. This means whatever Query that is decoded, first runs this rule and basically if I see there is a Query “SET”, I am going to ignore it. I.e it’s not a log I want and I am not going to put it into the alerts.log. Level 0 means, not to alert.

I am ignoring Query Set because in this case, we are finding millions of query set as it is invoked a lot of times and mostly it is false positives. I am interested in Query Selects, Inserts and Updates etc.

Once you have this rule put in, it will filter out all Query Sets. This is basically the only filtering we are doing so we don’t have those millions of Query Sets jamming up my alerts.log file in Alienvault.

alienvault:/var/ossec/logs/archives# ossec-logtest
2021/03/14 12:36:33 ossec-testrule: INFO: Reading decoder file alienvault/decoders/decoder.xml.
2021/03/14 12:36:33 ossec-testrule: INFO: Reading decoder file alienvault/decoders/local_decoder.xml.
2021/03/14 12:36:33 ossec-testrule: INFO: Started (pid: 12550).
ossec-testrule: Type one log per line.
192.168.1.62->\MySQLLOG/db.log 2021-03-14T16:22:58.573134Z 19 Query SET NAMES utf8mb4'
**Phase 1: Completed pre-decoding.
full event: '192.168.1.62->\MySQLLOG/db.log 2021-03-14T16:22:58.573134Z 19 Query SET NAMES utf8mb4''
hostname: 'alienvault'
program_name: '(null)'
log: '192.168.1.62->\MySQLLOG/db.log 2021-03-14T16:22:58.573134Z 19 Query SET NAMES utf8mb4''
**Phase 2: Completed decoding.
decoder: 'mysql-query'
**Phase 3: Completed filtering (rules).
Rule id: '195001'
Level: '0'
Description: 'Query set is found and ignored!'

So you see, from the above, all Query Sets are ignored. You can basically do whatever you wish by using either Regex or Match and ignore certain log messages from OSSEC itself. It’s very powerful and flexible and with enough time and effort, you can really filter out only the needed logs you want into Alienvault, which is really part of the fine-tuning process for SIEM.

So there you have it. What you have done now is to take those logs from archives.log and make sure you only put the logs you want in alerts.log (Quit, Connect, All Query except for Query Set).

The next thing you need to do is to go down to Alienvault (layer 3) and do the heavy lifting in writing plugins and get these events into the SIEM display.

For more information for Alienvault and how it can help your compliance, send us an email at alienvault@pkfmalaysia.com and we will get back to you ASAP!

Alienvault: File Integrity Monitoring on Linux Part 1

If you have been deploying or troubleshooting Alienvault long enough, you would know a few things: Alienvault is one of the most flexible SIEMs in the market. It has the most varied security features, and covers almost the entire spectrum of our PCI-DSS needs – from IDS, to SIEM, to File Integrity Monitoring, to vulnerability scaring to a partridge in a pear tree.

One of the products working under the Alienvault hood is OSSEC, which is a opensorce host based IDS. Sometimes, its interchangeable to HIDS, which is Host IDS, but really, the latter is simply the type; while the former is the actual name itself. For the sake of this article, we will interchange both terms.

OSSEC runs well with Windows, where Alienvault can do an auto deployment given the correct setup and credentials. However, it’s on Linux boxes that sometimes we get a bit concerned. Not because the product doesn’t work, but simply because the setting up of the installation. There is no auto deployment, so we need to set it up manually, and this might mean downloading the correct packages in the first place.

After this, we are going to look at a specific function of HIDS – File Integrity Monitoring or FIM for short.

Firstly, let’s get started. We have set up a simple CentOS 7 box in our lab in the same network as Alienvault, and we are going to install HIDS on this box as an AGENT. This will then talk to the Alienvault USM which is the server.

So let’s assume you have your agent system network setup (please ensure your DNS is set properly, you should be able to work this out in CentOS 7 either through the network tools or editing resolv.conf).

 yum groupinstall "Development Tools" -y

The CentOS development tools are very useful tools which is a bundle, used primarily for building and compiling software from source code. “Yum” here while making you think of going for a teh tarik is a command found in almost all red-hat based distros to run installations. It’s used for update, installations etc. In the old days before YUM, we would use RPM (which is really what YUM is using), but we would have to manually track down dependencies and it really sucks because to install an RPM package might mean to install a whole bunch of stupid libraries or updating stuff and you are basically running around the internet looking for RPMs like Where’s Wally. It looks awful now, but back in the days, RPM was heavensent. We didn’t need to do “tar”, configure, make, “make install” anymore!

Anyway, the -y argument behind simply automates the command by answering yes to the prompts. So once you run that, fingers crossed, everything runs ok and you get

Complete!

Which means everything is ok.

The next is to get the kernel-devel package.

yum install kernel-devel -y

This is a package that allows us to install a kernel driver later. It’s not the full kernel source, so it shouldn’t take too long before you see the “complete!”.

At this point you are ready to install OSSEC. If there are any issues, then troubleshooting is obviously required.

First, we need to locate the version of HIDS that can work with Alienvault. You might think heading to the latest HIDS in https://ossec.github.io/downloads.html might be the answer, but for Alienvault, we would recommend to get the 2.8.3 version. You can find it here:

https://bintray.com/ossec/ossec-hids/download_file?file_path=ossec-hids-2.8.3.tar.gz

So, go to a installation directory (optional) like /usr/src and run

curl -OL https://bintray.com/ossec/ossec-hids/download_file?file_path=ossec-hids-2.8.3.tar.gz

We used curl here because for some reason wget wasn’t installed. the -OL is supposed to handle the redirected links for that particular site and supposedly to rename it to a proper remote file name. It doesn’t do the rename though (don’t know?) and we wind up with a file called “download_file?file_path=ossec-hids-2.8.3.tar.gz”. Just rename it if you are into aesthetics to ossec-hids-2.8.3.tar.gz.

So now lets do an extraction

tar –xzvf ossec-hids-2.8.3.tar.gz

We now have a folder called ossec-hids-2.8.3. Go into this folder and then run

./install.sh

Once you run, you will be given a series of questions. Default should be fine for most, and you should just select ‘agent’ and also key in the server (Alienvault) IP address. Now if you are running a separate Alienvault setup (non-AIO), then this IP address is actually the address of your SENSOR. Not Alienvault Server. So don’t get mixed up. The Sensor is the Server. Hm.

So everything ready, fingers crossed, just go ahead and install. There will be a lot of text filling your screen but the important thing is that there is no ERROR or WARNING (well warning ain’t bad), but at the end you should have a welcome note stating

 Thanks for using the OSSEC HIDS.
 If you have any question, suggestion or if you find any bug, contact us 
at contact@ossec.net or using our public maillist at ossec-list@ossec.net 
(http://www.ossec.net/main/support/ ).

Press enter and you should be out of the installation. Congratulations!

You are not done yet. You still need to get Alienvault to talk to your box. The steps are as follows:

a) Generate an Agent Key from Alienvault

Go to your Alienvault AIO or your Server (since a standard sensor has no GUI, remember?).

Environment->Detection->Agents

Click “Add Agent”

Select the host from the list (It should be there automatically, but if it’s not just add it there through the asset list).

So now the agent has been created but you should see it as “Disconnected” from the list. Click the little Key sign that says “Extract Key”.

You should see something like

Agent key information for '2' is:

MiBIb3N0LTE5Mi0xNjgtMC01MCAxOTIuMTY4LjAuNTAgMDBmYzI0MzUyNzg4N.....etc
The garbled message is the key. So go ahead and highlight and copy it.

b) Import the key into the agent system

Go back to your agent system and head over to /var/ossec/bin and run

./manage-agents

Type in ‘I’ to import

Paste the whole key into the screen and confirm adding it.

Quit and then restart by going

/var/ossec/bin

And

./ossec-control restart

c) Restarting HIDS on the server

On the server head over to

Environment->Detection->HIDS Control

On the right side, click “Restart” the HIDS and you should be fine.

d) Check the Agent Logs

Head back to the agent system and check the logs

cd /var/ossec/logs
more ossec.log

You should (hopefully!) see

INFO: Connected to the server (192.168.0.xxx:1514).

where xxx is your server IP address.

Back in the USM server you will be able to see that now the agent is “Active”.

In the next article we will see if we can get the FIM to work.

Tonight, I Wanna Cry

There is a country song that goes:

I’ve never been the kind to ever let my feelings show,
And I thought that being strong meant never losin’ your self control
But I’m just drunk enough, to let go of my pain,
To hell with my pride, let it fall like rain, from my eyes,
Tonight I wanna cry.

And cry they did. Almost 75,000 and counting, over 99 countries hit by one of the largest ransomware attacks of all time, “WannaCry” and the other Wanna* variants.

Wannacry was released on the 12th of May 2017. The irony of it all was that we were invited as one of the speakers in a Ransomware event in Putrajaya under Panda Security the day before and we were just warning those in attendance that the next wave of ransomware is due to hit and within 24 hours, bam, we have Wannacry. In Malaysia, there seems to be already infection, thanks to the guys at

https://intel.malwaretech.com/botnet/wcrypt/?t=24h&bid=all

There have been reports of large telecommunication companies, banks and telcos are being affected. Tens of thousands of networks worldwide have been hit and the attacks do not appear to be targeted to any specific region or industry. Once infected, victims are asked to pay approximately $300 by Bitcoin. For the curious, you can check

https://bitref.com/13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94

This means there is around 5.8348 bitcoins paid already to this. Which translates to around RM46,000 paid so far – which isn’t so much if you think the average of ransom payment is around RM10,000 – RM11,000 for other ransoms.

So what is this?

Wannacry is using the file extension .wncry, and it also deletes the Shadow Copies (which is normal for ransomwares, like Locky) which is a technology introduced into the Microsoft platforms as far back as Windows XP and Windows Vista as the Volume Shadow Copy service. This means that even backup copies produced by this service, such as Windows Backup and System Restore will be screwed. That’s mean. Here is the command executed.

cmd.exe /c vssadmin delete shadows /all /quiet & wmic shadowcopy delete & bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no & wbadmin delete catalog -quiet (PID: 2292)

The following file is also created in the affected systems: @Please_Read_Me@.txt

How it gets in is just like any other ransomware: email either phishing or spear phshing. Basically, don’t click on any email attachments that are suspicious! It’s easier said than done, especially if you see one coming in stating that you are behind in your payments for your credit card. Resist the urge. One of the things to check on email:

The return email – most phishing doesn’t even attempt to spoof their email, and you will get emails coming from strange domains like maaybank or clmbclicks. Bad language is also a hallmark of a phishing email. “All your base are belong to us” type of english. Anyone asking for passwords, or click on a link etc is nonsense. Don’t click on email links. Don’t click on the attachments, above all.

Back to Wannacry. It exploits a known Microsoft Windows vulnerability to spread. This vulnerability was released as part of the Shadow Brokers leaks back in April. It hits the SMB (Server Message Block) – some people pronounce it as SAMBA, which technically is not so correct, as SAMBA is the SMB implementation on Linux. It basically allows the sharing of files and printers in networked environment. Which means, if one gets infected, the infection spreads through network shares even to systems without connectivity to the internet.

Microsoft released a patch for MS17-010 on March 14th 2017. Obviously, a lot of systems – especially those in healthcare still runs on Windows XP. The case has been deemed so serious that Microsoft has taken the step to release patches for systems already dead like XP! This shows how unusually dangerous this ransomware is.

OK, so if you have been hit, what do you do?

Well, you can pay. Around 41 transactions have been made so you could make the number, but don’t expect too much out of it. In fact, we probably do not recommend this course of action. You need to remove Wannacry and there are plenty of sites that gives details on that. The problem with ransomware is not so much of removing it, its a matter of recovering your files. Here’s a site you can check if there is a decryptor available:

https://www.nomoreransom.org/crypto-sheriff.php

Please be careful – some so called ‘decryptors’ are disguised as further malware and gets you a double whammy of sorts, so you need to ensure these are proper tools and not something you download from torrent.

As an advisory to all our clients, especially PCI-DSS here’s what you can do to protect yourself:

a) PATCH

https://technet.microsoft.com/en-us/library/security/ms17-010.aspx

Now we see how important it is to patch your systems. Most PCI clients struggle on this and the examples can come from: Our servers are not connected to the internet, or If I patch, my application breaks. Well, if your application breaks then you need to get a warranty from your developers or get them to upgrade and improve.

b) Backup

While PCI doesn’t really focus much on backup or BCP (after all PCI’s interest is in the confidentiality of credit card and not the availability of your business) – it’s still good practice to backup your system. And not just online as ransomware hits shadow copies firstly – but offline backup and ensure your restoration has been tested. Remember those grandfather-father-son backup scheme you learnt in college and university? Yup, it can be applied.

c) Antivirus and Antimalware Updates

While it’s known Antivirus is missing a chunk of malware out there, it’s still for many systems the last line of defence and most vendors have released protection signatures for the ransomware so get it updated. It’s like having the final militia protecting against an invasion. It will probably not hold out forever, but at least it buys your administrators some time.

d) Remove SMB v1 support

https://support.microsoft.com/en-us/help/2696547/how-to-enable-and-disable-smbv1,-smbv2,-and-smbv3-in-windows-vista,-windows-server-2008,-windows-7,-windows-server-2008-r2,-windows-8,-and-windows-server-2012

Simply, for Windows 8 for instance, you need to run Powershell in administrator mode and then just issue

Set-SmbServerConfiguration -EnableSMB1Protocol $false

to disable SMBv1

e) Network segmentation

While this is helpful, it still doesn’t save everyone. Segmentation helps because it isolates computers. Vector of attacks usually comes into the access network (where end users access) and if you segment this from the critical systems, you will need the malware to traverse through your firewall or a filtering device in between which leads us to:

f) IDS, SIEM, IPS or any protection systems you have!

If you don’t have any IDS, IPS or SIEM deployed in your environment, it’s time you get one and this is a good argument for your business budget. IDS/IPS are usually available features in most firewalls these days, so if you segregate your networks, you can then enable these features and it should detect or prevent malware coming into your critical environment.

SIEM is critical. Security Information and Event Management systems have been around since the dawn of time but most companies avoid these due to costs, ever relying on the good old free syslog services. No, not allowed anymore, as far as PCI is concerned. We need more visibility over these logs, malicious traffic and even outgoing traffic to check if there is any communications with a command and control (C&C) server, which is the normal operations of these ransomware. SIEM these days are also no longer that expensive, with a Gartner SIEM like Alienvault starting off at a little over RM25K to get it up and running. We recently deployed a very large SIEM deployment over AWS cloud and on-premise on a major airlines with a fraction of the cost compared to traditional SIEM deployments.

There you have it. WannaCry is a very serious outbreak and we will be monitoring this system and also making our visits to our clients to give a short talk and description over it. If you have any questions over this, or on PCI-DSS or SIEM, drop us a note at avantedge@pkfmalaysia.com.

Stay safe!

Deployment of Alienvault in Practice Part 2

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So now you have a server instance of Alienvault in your network and you need to get your sensors up and running.

While a majority of small deployment can do with an All-In-One, there are reasons why you might need a separate server/sensor config. Remote sites for instance; where you want the sensor located onsite to perform log normalization, vulnerability assessments, availability etc. The sensor does quite a fair bit of work as well – and on top of that, it balances out the EPS. Remember, the AIO has a limit on EPS, so if you are looking at anything beyond 1,000 EPS, you are going to struggle to keep up with the events without a sensor.

Deploying a sensor is straightforward.

First, it’s important to understand a sensor does not have a GUI frontend, so all config is done on the Alienvault Setup Menu or CLI. This doesn’t make it any more difficult – in fact the hardest part of it is to include in the License Key in the menu – since we can’t cut and paste, so you need to make sure you do it correctly.

Second, you should always have a server instance before you go around setting up the sensor.

In the Alienvault Setup, go to Configure Sensor->Configure Alienvault Server IP. Now this should be your server IP. Some have asked should it be the management IP or the Logging IP. It should be the management IP, unless of course your management IP is not reachable, in that case, the only reachable IP is the logging IP of your server.

So go ahead and do the same for your framework IP address as well. Apply all changes and you are set.

Head back to the server, and go to the UI

Configuration->Deployment->Sensors

You will see the following message

Warning: The following sensors are being reported by as enabled by the server, but aren’t configured

Don’t worry about this, just click on Insert and you are done. It’s that straightforward. You will see the sensor listed, with the context it’s under, version and the status should have a checkbox next to t.

The final part is to get the Logger up and running.

Opposite from the sensor, the Logger is setup via the UI.

What’s important to understand here is that the flow is Sensor -> Server -> Logger.

So the logger is actually the end of the flow where all your logs are forensically stored and archived and validated. As far the server is concerned, it sees the Logger as a Parent.

ON THE LOGGER

Head over to the Logger UI (having already set it up as you did the server initially with IP Addresses, Licenses etc)

Go to Configuration->Deployment-> Servers and use “Add Server”

Again go ahead and use the IP address you have been using to define your server during your sensor config.

Once you have added the server and saved, head back to the Server screen and click on your logger instance (which should be there by default already)

Now select “NO” for everything except “LOG” in the form.

That’s it. You shouldn’t be type in the REMOTE USER and all that as this is done later in the Server.

ON THE SERVER

Now, back to the Server UI. Go to the same Configuration->Deployment->Servers.

It sometimes can get confusing here as the UI is the same, so make sure you name your Logger and Server appropriately!

On the server, you should see both the SERVER and LOGGER under the UI.

Modify the LOGGER (remember, you are on the SERVER UI, NOT THE LOGGER UI).

You won’t be able to change anything in there but you can set the Remote Admin and password to log into the Logger. Use the admin credentials (not the root) and let the URL populate itself by clicking on it.

Set “Remote Logger”

Finally, go back to the server screen and click on the SERVER -> Modify

You can now opt to set up Log to NO. Under that, in the Forward Servers option, click Add Server and go ahead add in your Logger.

Save and Apply all changes.

Click on Server Hierarchy and we have a nice primitive depiction of the Server pointing to the Logger. Well Done!

Now –  a note: If you are using an AIO UA as a server instance, you can set up the Log to YES in the AIO. That means you are logging in both locations.

In your logger, interface you will see that you have two different color boxes, depicting which Logger it is sent to.

If for some reason you want to say, OK, for asset 1 – 20 send to AIO, and for Asset 21 – 100, send to the Logger, you can disable the forwarding we set up above, and do it via policies. The great thing about Alienvault is that it allows that granular flexibility to control where your AIO wants to forward (or not forward) logs to.

We will explore Policy Setup in the future.

For now, enjoy your three piece band – Sensor, Server and Logger!

 

Deployment of Alienvault in Practice Part 1

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In this article, we are going to explore deploying Alienvault in practice. While there are many documents out there that give pretty clear steps on what to do, these documents are somewhat pretty distributed, and we don’t want to come to a point where we are 85% into the deployment, only to find that we were supposed to do something 25% in and did not do it.

Before anything else, you should have a deployment checklist to make sure everything is in order. The checklist is pretty long, much too detailed to put into a post like this Email us at alienvault@pkfmalaysia.com, and we can get you started.

In this example, we will be using a 3 piece band: the Server, the sensor and the logger. You can generally just trade the server for an AIO, which we did, but in general, it’s going to serve as a server. Remember though, with an AIO, you do have an additional sensor if you want to enable it, or a logger as well, with around 4 TB of compressed space (vs 9TB of compressed space for a standalone logger).

With that out of the way, and assuming that physically everything is racked and connected, and the VMs are up and running, you are ready to go. Remember, if you have separate systems, always start with the server (or the AIO) first, and then only move on to the sensor. Else, your sensor might be orphaned.

Now, of course, if you are using virtual appliance, your VMWare needs to be set up. Some questions we encountered is, how many interfaces we should have. Well, you should have the management interface (and use that as log collection), and the other interfaces would be for monitoring. Now one of the trick questions here is that, hey, I want to have a separate management interface and log collection interface. So that you know, nobody knows my management interface.

Possible. But we have seen deployments where both the management interface and log collection interface sits on the same subnet. This is probably going to cause some issues – one of it is routing might likely be screwed up. Another thing is that deployment of HIDS might constantly refer back to the management interface. So, rule of the thumb:

If you only have one subnet, just use the one interface for management and log collection.

Another question we have is, by default, AIO comes with six interfaces. (because, remember, it’s also a sensor!). Some clients have it in their minds to use all six interfaces. Generally, aside from the management and log, all the other interfaces won’t be assigned an IP and will be monitoring interfaces (i.e put it in a SPAN port and monitor away). Now unless you have very specific reasons to, it would not be so likely to use all monitoring interfaces (depending on how you set it up), so don’t feel like you are losing out. A lot of the setups we see simply has the sensor or AIO located at a central switch with SPAN or TAP and monitors fine.

Another question: Thin or thick provisioning for disk format. Well – we are used to just setting it as thin, meaning that it will just grow as the logs increase, but if you have space, setting it to thick might still be fine. I am not a VMWare guru, and I am sure the VMWare gurus out there will go into battle with this one, but we’ve deployed on both disk format and it doesn’t seem to have an extreme impact at all. Of course, I stand to be corrected.

Yet another question (even before we go into deployment!) is if I buy a hardware with a hard drive of 200TB, can Alienvault use all the 200TB instead of the measly 1TB for AIO and 1.8TB for Logger? The short of the answer is no, the size of the virtual machine is in the OVF itself, so if you purchase a ridiculous amount of hard drive space, the alienvault image is still going to occupy what it is going to occupy. But hey, you could start hosting other virtual systems there of course and use them up!

Setting up the server

1) Ok, finally, let’s get down to it. Once you boot up and assuming you have installed the OVF correctly if you are running virtual appliance, you will be dropped into the setup menu. Select Manual network interface and define an IP. I would suggest this as opposed to depending on a DHCP server. Aside from that, other setup paramaters are what you should expect and should be able to fill up pretty easily.

Now one of the annoying things that sometimes we face is that when the initial setup is rebooted, we get stuck at that Alienvault face that keeps loading but nothing happens. To be safe, when you reboot, just keep pressing ESC till you see the booting details. If you are still stuck, alt+F2 might be able to escape you. Else, you might need to give it the good old Vulcan Nerve Pinch. (Ctrl-Alt-Del).

Other times, you might just be stuck at VMWare console and the annoying “Waiting for connection” that seems to hang. Your system is fine, it’s just the VMWare console is moody. Restarting your Vsphere might do the trick.

Once you can SSH into your box you are confronted with a login screen and once logged in, you need to change the root password. Don’t forget it!

After that, register your appliance. Now, if you are running on AIO/server/logger, I would suggest to do an online Web UI registration. Obviously you will need connectivity to the internet. You can copy and paste your product license key once you access the Web UI as there will be an option for you in the Free Trial Screen. After that, you can set up the admin user and password. There is an offline technique as well, or if you are in the mood to type the entire license, you can do so from the alienvault menu itself.

After this is done, set up the hostname. You need to do this from the alienvault setup menu, select System Preferences -> Configure Hostname.

Make sure you apply all changes. Once you apply all changes, go ahead and reboot the appliance from the menu itself.

Another important thing is to change the time zone. After reboot, head over to

System Preferences -> Change Location -> Date and Time -> Configure Time Zone. Select the place you are at and apply all changes.

Likewise, you might want to use an NTP (network time protocol) server as well. In the same Data and Time menu, select Configure NTP Server. Enable it by selecting it and put in the NTP hostname (if you have DNS defined) or IP. Apply everything.

Now, this might be a good time to check on the linux box if your time is correct.

Jail Break your system, and type in ‘date’, you should see it changed.

Likewise go to WebUI, login and click on Settings at the top right. Make sure the time zone for that user is properly defined. Now check back on the SIEM (Analysis -> SIEM) on the WebUI , you should see the Date as whatever timezone you have defined yourself in.

Timestamping is obviously a big deal in any SIEM, and other than these areas to be wary off, we should also know that individual plugins also have timezone options. This is helpful if the data source suddenly changes timezones and we have to accomodate the data source.

It looks like the server is all set. If you have an AIO, you should also now see under

Configuration -> Deployment -> Sensors / Servers , your IP address because you are a Sensor and a Server.

Next, we will look at setting up the sensor and logger.

 

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