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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: 2026-07-20T11:00:00Z · Confidence: medium

Hunt Hypothesis

This hunt targets adversaries leveraging C#-based red and black team tools that expose unique TypeLibGUID artifacts to evade standard signature-based detection. Proactively hunting for these GUIDs in Azure Sentinel is essential because they often indicate early-stage reconnaissance or post-exploitation tool deployment that may otherwise remain invisible until a broader incident occurs.

YARA Rule

rule HKTL_NET_GUID_Stealth_Kid_RAT {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/ctsecurity/Stealth-Kid-RAT"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "bf43cd33-c259-4711-8a0e-1a5c6c13811d" ascii nocase wide
        $typelibguid1 = "e5b9df9b-a9e4-4754-8731-efc4e2667d88" 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 4 specific false positive scenarios for the rule “Detects c# red/blue-team tools via typelibguid” in an enterprise environment, including suggested filters and exclusions:

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