Yara Rules error

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Yara Rules error

L2 Linker

Hi,

 

Trying to use yarascan automation from yara pack on marketplace, always receiving "HasMatch: false"

 

Here it goes the printscreen with the command and the contextdata showing the entryid

 

FabioFerreira_0-1679411632399.png

 

The content has that rule

 

FabioFerreira_1-1679411743582.png

 

Could you help?

 

Regards,

Fábio

 

 

1 accepted solution

Accepted Solutions

L3 Networker

I think the issue here is the arguments. 

 

The yaraRule parameter is supposed to be a raw YARA rule, and the entryIDs parameter is a list of files to evaluate with the yara rule. (ie, the files which may or may not match a rule) In normal usage I wouldn't expect any of the entryIDs to be a .yar file, and the rule name on it's own will not compile as a valid yara rule.

 

If you need to use arbitrary rules inside yar files you'll need to read the data from the yar file first, then pass it to YaraScan eg with a wrapper script.

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4 REPLIES 4

L2 Linker

In the context I see the yara file, What you are trying to accomplish is scan a file with a YARA rule to figure out if it matches right?

 

Try with the below YARA rule. This will come true for any file. 

 

rule match_any_file { condition: true }

 

Let me know if it works, we'll try to troubleshoot further

L2 Linker

Hi,

 

I changed the yara file and added the following

 

FabioFerreira_1-1679482569709.png

 

 

And tried again with the same issue

 

FabioFerreira_2-1679482960134.png

 

 

Regards,

Fábio Ferreira

 

 

L3 Networker

I think the issue here is the arguments. 

 

The yaraRule parameter is supposed to be a raw YARA rule, and the entryIDs parameter is a list of files to evaluate with the yara rule. (ie, the files which may or may not match a rule) In normal usage I wouldn't expect any of the entryIDs to be a .yar file, and the rule name on it's own will not compile as a valid yara rule.

 

If you need to use arbitrary rules inside yar files you'll need to read the data from the yar file first, then pass it to YaraScan eg with a wrapper script.

L2 Linker

Hi @chrking ,

 

Got it.

Thank you for your help.

 

Regards,

Fábio Ferreira

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