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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

CommentCrew-threat-apt1 detects potential adversary behavior involving suspicious comment-based scripts or obfuscated PowerShell commands commonly used by threat actors to execute malicious payloads. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage attacks that may evade traditional detection mechanisms.

YARA Rule

rule DownloaderPossibleCCrew
{

    meta:
        author = "AlienVault Labs"
        info = "CommentCrew-threat-apt1"
        
    strings:
        $a = "%s?%.6u" wide ascii
        $b = "szFileUrl=%s" wide ascii
        $c = "status=%u" wide ascii
        $d = "down file success" wide ascii
        $e = "Mozilla/4.0 (compatible; MSIE 6.0; Win32)" 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