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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_Fakewmi

FakeWMI payload

MalwareFakewmiditekSHen 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

FakeWMI payload

Associated malware family: Fakewmi.

Targets: Windows PE.

It defines 9 patterns (9 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-fakewmi.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Fakewmi : FILE
{
	meta:
		description = "FakeWMI payload"
		author = "ditekSHen"
		id = "689bc207-2bc6-50de-80d6-d1ba0a26b264"
		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#L1047-L1064"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "627886cdd01f5f02e454ef284c77c87eb027ee33f6a51536758fb7f095271a40"
		score = 75
		quality = 75
		tags = "FILE"
		clamav_sig = "MALWARE.Win.Trojan.Fakewmi"

	strings:
		$s1 = "-BEGIN RSA PUBLIC KEY-" ascii
		$s2 = ".exe|" ascii
		$s3 = "cmd /c wmic " ascii
		$s4 = "cmd /c sc " ascii
		$s5 = "schtasks" ascii
		$s6 = "taskkill" ascii
		$s7 = "findstr" ascii
		$s8 = "netsh interface" ascii
		$s9 = "CreateService" ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( all of ( $s* ) and #s2 > 10 )
}

Strings (9 patterns)

IdentifierTypeValueModifiers
$s1text"-BEGIN RSA PUBLIC KEY-"ascii
$s2text".exe|"ascii
$s3text"cmd /c wmic "ascii
$s4text"cmd /c sc "ascii
$s5text"schtasks"ascii
$s6text"taskkill"ascii
$s7text"findstr"ascii
$s8text"netsh interface"ascii
$s9text"CreateService"ascii

Condition

uint16( 0 ) == 0x5a4d and ( all of ( $s* ) and #s2 > 10 )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in ( $s* ) must match.
  • Pattern $s2 must occur > 10 times.

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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: 689bc207-2bc6-50de-80d6-d1ba0a26b264

Metadata

clamav_sigMALWARE.Win.Trojan.Fakewmi

Tags:FILE

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