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CommentCrew-threat-apt1

yara LOW Yara-Rules
aptcommunity
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-05-18T11:00:00Z · Confidence: medium

Hunt Hypothesis

The CommentCrew-threat-apt1 rule detects potential adversary behavior involving suspicious comment creation or modification in Azure resources, which may indicate reconnaissance or persistent access. SOC teams should proactively hunt for this behavior to identify early-stage threats and prevent lateral movement within cloud environments.

YARA Rule

rule APT1_MAPIGET
{

    meta:
        author = "AlienVault Labs"
        info = "CommentCrew-threat-apt1"
        
    strings:
        $s1 = "%s\\Attachment.dat" wide ascii
        $s2 = "MyOutlook" wide ascii
        $s3 = "mail.txt" wide ascii
        $s4 = "Recv Time:" wide ascii
        $s5 = "Subject:" wide ascii

    condition:
       all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 5 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_APT1.yar