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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 establish persistence or conduct reconnaissance within Azure environments. Proactively hunting for these specific identifiers allows the SOC team to distinguish legitimate security operations from malicious tooling, ensuring early detection of potential lateral movement or command-and-control activities before they escalate in severity.

YARA Rule

rule HKTL_NET_GUID_DesktopGrabber {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/NYAN-x-CAT/DesktopGrabber"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "e6aa0cd5-9537-47a0-8c85-1fbe284a4380" 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, tailored for an enterprise environment:

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