← Back to SOC feed Coverage →

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# Red/Black team tools that generate unique TypeLib GUIDs in the registry to establish persistence or execute custom payloads within Azure Sentinel environments. Proactively hunting for these specific artifacts is critical because their presence often indicates advanced reconnaissance or post-exploitation activities that may evade standard signature-based detections due to their low severity classification and dynamic nature.

YARA Rule

rule HKTL_NET_GUID_Csharp_Loader {
    meta:
        description = "Detects c# red/black-team tools via typelibguid"
        reference = "https://github.com/NYAN-x-CAT/Csharp-Loader"
        author = "Arnim Rupp"
        date = "2020-12-13"
    strings:
        $typelibguid0 = "5fd7f9fc-0618-4dde-a6a0-9faefe96c8a1" 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 5 specific false positive scenarios for the HKTL_NET_GUID detection rule 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