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DITEKSHEN_MALWARE_Win_Klackring

Detects Klackring variants. Associated with ZINC / Lazarus

MalwareKlackringditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detects Klackring variants. Associated with ZINC / Lazarus

Associated malware family: Klackring.

Targets: Windows PE.

It defines 7 patterns (7 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-klackring.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Klackring : FILE
{
	meta:
		description = "Detects Klackring variants. Associated with ZINC / Lazarus"
		author = "ditekSHen"
		id = "7bd9a68f-d58b-5437-a28b-5a7f1a11038e"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L4461-L4475"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "b894e89de720affadd80966d726a44ffce75d71095b0530edb6bfddb76660c54"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "%s\\%s.dll" fullword wide
		$s2 = "cmd.exe /c move /Y %s %s" fullword wide
		$s3 = "%s\\win32k.sys" fullword wide
		$s4 = "NetSvcInst_Rundll32.dll" fullword ascii
		$s5 = "Spectrum.dll" fullword ascii wide
		$s6 = "%s\\cmd.exe" fullword wide
		$s7 = ".?AVA5Stream@@" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and 6 of them
}

Strings (7 patterns)

IdentifierTypeValueModifiers
$s1text"%s\\%s.dll"fullword wide
$s2text"cmd.exe /c move /Y %s %s"fullword wide
$s3text"%s\\win32k.sys"fullword wide
$s4text"NetSvcInst_Rundll32.dll"fullword ascii
$s5text"Spectrum.dll"fullword ascii wide
$s6text"%s\\cmd.exe"fullword wide
$s7text".?AVA5Stream@@"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and 6 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 6 patterns in the rule must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 7bd9a68f-d58b-5437-a28b-5a7f1a11038e

Tags:FILE

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