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TA_Loki

This app is NOT supported by Splunk. Please read about what that means for you here.
Overview
Details
Loki scanner is one of the famous yara rule scanner which have multiple usage in Incident Response and searching the environment for any indication of compromise.
we decided to get benefit of Splunk capability and automate the scan activity from Splunk by creating addon to install it on agents and Application to help threat hunter and the analyst to review the result of scan more effectively

For full document, check this link: https://blue-v3n0m.blogspot.com/2022/05/automate-loki-using-splunk.html

Prerequisites:

1) install the add-on and unarchive it to add the below dependencies before deploying it

2) install Loki scanner from github, we prefer to use version 0.33 (most stable) "https://github.com/Neo23x0/Loki/releases/tag/0.33.0"
2.1) copy {config, docs,plugins, tools, license, loki.exe} to the addon TA_loki/bin

3) install Loki master scanner from the github "https://github.com/Neo23x0/Loki"
3.1) copy {loki-upgrader.py} to TA_loki/bin
3.2) copy files inside {lib} to TA_loki/bin/lib

4) Comment out some libraries that are not used and they have dependencies:
4.1) TA_loki\bin\lib\helpers.py -- comment out import psutil & import netaddr
4.2) TA_loki\bin\lib\helpers.py -- comment out import rfc5424logging

5) Splunk Agent on windows need to be running with admin privilage as loki scanners require that.

How to use:

1) After doing the above prerequisites archive the TA_Loki add-on and push it to the Splunk Deployment Server --> $SPLUNK_HOME/etc/deployment-apps

2) copy 2 lib from TA_loki/bin/lib to $SPLUNK_HOME/lib/python3.7/site-packages/
2.1) cp -R TA_loki/bin/lib/colorama $SPLUNK_HOME/lib/python3.7/site-packages/
2.2) cp -R TA_loki/bin/lib/colorama-0.4.4.dist-info/ $SPLUNK_HOME/lib/python3.7/site-packages/

3) Run signature upgrade for loki, use same user running Splunk service (in my case Splunk user). the signature updater better to run before scanning devices interval
***if using $SPLUNK_HOME different than /opt/splunk change it in TA_loki/bin/update-signature.sh
3.1) run:
$SPLUNK_HOME/bin/splunk cmd $SPLUNK_HOME/etc/deployment-apps/TA_loki/bin/update-signature.sh
or you can schedule it using crontab feature in Linux

4) set the interval of running inside inputs.conf
mkdir TA_loki/local
[script://$SPLUNK_HOME\etc\apps\TA_Loki\bin\loki.bat]
disabled = false
index = <Index>
sourcetype = loki_exec
interval = 0 23 25-31 * <set your preference for scanning schedule>

Customization

1) logs are written by default in %SPLUNKPATH%\var\log\TA_Loki, you can change it from TA_Loki/bin/loki.bat

2) scan runs on C: driver only, you can change it from TA_Loki/bin/loki.bat

Release Notes

Version 1.0.0
April 13, 2022

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