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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_NET_GUID_Farmer

Detects .NET red/black-team tools via typelibguid

Hack toolSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Arnim Rupp (https://github.com/ruppde)
Date
2023-03-22
Modified
2025-08-15
Score / Quality
75 / 85

What this rule detects

Detects .NET red/black-team tools via typelibguid

Targets: Windows PE.

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hktl-net-guid-farmer.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_NET_GUID_Farmer : FILE
{
	meta:
		description = "Detects .NET red/black-team tools via typelibguid"
		author = "Arnim Rupp (https://github.com/ruppde)"
		id = "f69745b9-4ebd-547a-9af3-bc340b076e5d"
		date = "2023-03-22"
		modified = "2025-08-15"
		reference = "https://github.com/mdsecactivebreach/Farmer"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_github_net_redteam_tools_guids.yar#L4774-L4790"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "3e8559dd84fdc698c47acdf19a3f28fe094c96a36d645422f69ad905df5b2263"
		score = 75
		quality = 85
		tags = "FILE"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"

	strings:
		$typelibguid0lo = "37da2573-d9b5-4fc2-ae11-ccb6130cea9f" ascii wide
		$typelibguid1lo = "49acf861-1c10-49a1-bf26-139a3b3a9227" ascii wide
		$typelibguid2lo = "9a6c028f-423f-4c2c-8db3-b3499139b822" ascii wide
		$typelibguid3lo = "1c896837-e729-46a9-92b9-3bbe7ac2c90d" ascii wide

	condition:
		( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and any of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$typelibguid0lotext"37da2573-d9b5-4fc2-ae11-ccb6130cea9f"ascii wide
$typelibguid1lotext"49acf861-1c10-49a1-bf26-139a3b3a9227"ascii wide
$typelibguid2lotext"9a6c028f-423f-4c2c-8db3-b3499139b822"ascii wide
$typelibguid3lotext"1c896837-e729-46a9-92b9-3bbe7ac2c90d"ascii wide

Condition

( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and any of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least one pattern in the rule must match.

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References

Licence & attribution

Author: Arnim Rupp (https://github.com/ruppde)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (stated in the rule's own meta)

“Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE”

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: f69745b9-4ebd-547a-9af3-bc340b076e5d

Tags:FILE

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