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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: 2026-07-19T23:00:00Z · Confidence: medium

Hunt Hypothesis

This hunt hypothesizes that adversaries are deploying C#-based red or black team tools within the environment, identifiable by unique TypeLibGUID artifacts often used to evade standard signature-based detection. Proactively hunting for these GUIDs in Azure Sentinel is critical because it allows the SOC team to distinguish between legitimate internal tooling and potential adversary infrastructure before malicious activity escalates.

YARA Rule

rule HKTL_NET_GUID_Evasor {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/cyberark/Evasor"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "1c8849ef-ad09-4727-bf81-1f777bd1aef8" 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 1 string patterns in its detection logic.

References

False Positive Guidance

Here are 4 specific false positive scenarios for the Detects C# Red/Black-Team Tools via TypelibGUID rule, including suggested filters and exclusions:

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