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Validating YARA Rules in Apex One Endpoint Sensor

    • Updated:
    • 21 Oct 2021
    • Product/Version:
    • Apex One - Endpoint Sensor
    • Platform:
Summary

Users sometimes may encounter YARA rule syntax error issues when using Live Investigation in Apex One Endpoint Sensor, but it might be not easy to find the pain point.

This article is about how to validate the YARA rule by yourself to know where the YARA rule syntax issue is.

Details
Public

To validate the YARA rule, do the following:

  1. Prepare a Redhat/CentOS endpoint and install the required library.

    yum install epel-release
    yum install python
    yum install python-yara
    
  2. Create a simple python script to verify the YARA rules file. Here, we used sample_yara.yar as the sample target.

    import yara
    rules=yara.compile(filepath='/tmp/sample_yara.yar')
    
  3. Launch the python script to validate the rule.

    python yara_validate.py
    

Any errors encountered will be displayed on the console and indicate the line number and error encountered. Users can fix the issue on their own.

 
If there is no output, it means that no errors were encountered.
 
Traceback (most recent call last):
File "yara_validate.py", line 3, in <module>
rules=yara.compile(filepath='/tmp/sample_yara.yar')
yara.SyntaxError: /tmp/sample_yara.yar(3): syntax error, unexpected _IDENTIFIER_, expecting _CONDITION_
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Rating:
Category:
Configure; Troubleshoot
Solution Id:
000289493
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