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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_NET_GUID_Njcrypter

Detects c# 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
2020-12-13
Modified
2025-08-15
Score / Quality
75 / 85

What this rule detects

Detects c# red/black-team tools via typelibguid

Targets: Windows PE.

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hktl-net-guid-njcrypter.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_NET_GUID_Njcrypter : FILE
{
	meta:
		description = "Detects c# red/black-team tools via typelibguid"
		author = "Arnim Rupp (https://github.com/ruppde)"
		id = "c30c8323-9418-521a-a4fc-6be0113b99b5"
		date = "2020-12-13"
		modified = "2025-08-15"
		reference = "https://github.com/0xPh0enix/njCrypter"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_github_net_redteam_tools_guids.yar#L338-L352"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "2e3c616b75e15ad082cf0871b7ef8e04f0c2a937000f4bea6927962451ac7f12"
		score = 75
		quality = 85
		tags = "FILE"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"

	strings:
		$typelibguid0lo = "8a87b003-4b43-467b-a509-0c8be05bf5a5" ascii wide
		$typelibguid1lo = "80b13bff-24a5-4193-8e51-c62a414060ec" ascii wide

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

Strings (2 patterns)

IdentifierTypeValueModifiers
$typelibguid0lotext"8a87b003-4b43-467b-a509-0c8be05bf5a5"ascii wide
$typelibguid1lotext"80b13bff-24a5-4193-8e51-c62a414060ec"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: c30c8323-9418-521a-a4fc-6be0113b99b5

Tags:FILE

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