Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: Internet Storm Center Diary 2021-08-16 InfoSec Handlers Diary Blog


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Extra Tip For Triage Of MALWARE Bazaar's Daily Malware Batches

Published: 2021-08-16
Last Updated: 2021-08-16 10:28:26 UTC
by Didier Stevens (Version: 1)
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Here's an extra tip to my diary entry "Simple Tips For Triage Of MALWARE Bazaar's Daily Malware Batches".

You can also use YARA rules together with my zipdump tool:

I'm using 2 simples rules to detect Office documents with VBA macros:

rule olevba {
    strings:
        $attribut_e = {00 41 74 74 72 69 62 75 74 00 65}
    condition:
        uint32be(0) == 0xD0CF11E0 and $attribut_e
}

rule pkvba {
    strings:
        $vbaprojectbin = "vbaProject.bin"
    condition:
        uint32be(0) == 0x504B0304 and $vbaprojectbin
}

Rule olevba is for binary (ole) office documents, and rule pkvba is for OOXML documents.

Remark: these rules are designed for triage: they might generate false positives or negatives.

Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com

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ISC Stormcast For Monday, August 16th, 2021 https://isc.sans.edu/podcastdetail.html?id=7630
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