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Detects c# red/black-team tools via typelibguid

yara LOW Yara-Rules
communitynet_guid
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: 2026-07-21T11:00:01Z · Confidence: medium

Hunt Hypothesis

This hunt targets adversaries deploying C# red and black team tools that leverage typelibguid to evade antivirus detection within the NET_GUID malware family. Proactively hunting for this behavior in Azure Sentinel is critical because these legitimate-looking artifacts are frequently repurposed by threat actors to establish persistence while remaining invisible to standard signature-based defenses.

YARA Rule

rule HKTL_NET_GUID_AV_Evasion_Tool {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/1y0n/AV_Evasion_Tool"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "1937ee16-57d7-4a5f-88f4-024244f19dc6" ascii nocase wide
        $typelibguid1 = "7898617d-08d2-4297-adfe-5edd5c1b828b" ascii nocase wide
    condition:
        (uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550) and any of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 2 string patterns in its detection logic.

References

False Positive Guidance

Here are 5 specific false positive scenarios for the Detects c# red/black-team tools via typelibguid rule, tailored for an enterprise environment:

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