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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_NET_NAME_RAT_Njrat_0_7D_Modded_Source_Code

Detects .NET red/black-team tools via name

Hack toolNjratSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Arnim Rupp
Date
2021-01-22
Modified
2026-02-23
Score / Quality
75 / 85

What this rule detects

Detects .NET red/black-team tools via name

Associated malware family: Njrat.

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-name-rat-njrat-0-7d-modded-source-code.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_NET_NAME_RAT_Njrat_0_7D_Modded_Source_Code : FILE
{
	meta:
		description = "Detects .NET red/black-team tools via name"
		author = "Arnim Rupp"
		id = "2b7d1f75-0164-561e-8199-32c601cbca98"
		date = "2021-01-22"
		modified = "2026-02-23"
		reference = "https://github.com/AliBawazeEer/RAT-NjRat-0.7d-modded-source-code"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_github_net_redteam_tools_names.yar#L513-L526"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "f437195348452242adc8b55d6d517a17764c53188fa2de5cd15848fd23827381"
		score = 75
		quality = 85
		tags = "FILE"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"

	strings:
		$name = "RAT-NjRat-0.7d-modded-source-code" ascii wide
		$compile = "AssemblyTitle" ascii wide

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

Strings (2 patterns)

IdentifierTypeValueModifiers
$nametext"RAT-NjRat-0.7d-modded-source-code"ascii wide
$compiletext"AssemblyTitle"ascii wide

Condition

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

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule must match.

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References

Licence & attribution

Author: Arnim Rupp

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: 2b7d1f75-0164-561e-8199-32c601cbca98

Tags:FILE

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