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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: 2026-07-19T11:00:00Z · Confidence: medium

Hunt Hypothesis

This hunt hypothesis posits that adversaries are deploying C#-based red and black team tools within the environment to establish persistence or conduct reconnaissance, identifiable by unique TypeLibGUID artifacts in process execution logs. Proactively hunting for these specific GUIDs in Azure Sentinel is critical because they often indicate legitimate security tooling masquerading as malicious activity or reveal unauthorized tool usage that could be leveraged for lateral movement before a full-scale incident occurs.

YARA Rule

rule HKTL_NET_GUID_NoAmci {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/med0x2e/NoAmci"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "352e80ec-72a5-4aa6-aabe-4f9a20393e8e" 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 rule “Detects C# Red/Black-Team Tools via TypelibGUID”, including suggested filters and exclusions:

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