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DITEKSHEN_MALWARE_Win_UNK03

Detects unknown malware

MalwareUNK03ditekSHen 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 unknown malware

Associated malware family: UNK03.

Targets: Windows PE.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-unk03.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_UNK03 : FILE
{
	meta:
		description = "Detects unknown malware"
		author = "ditekSHen"
		id = "b0711427-b6bf-5e4b-af36-9c752ead4d6c"
		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#L5267-L5280"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "f1a4be68206628c3addbce8b6bbc1f801e67632d4e6a6af1d45cdad833e9a991"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "Software\\Microsoft\\Windows\\CurrentVersion" ascii
		$s2 = "rundll32.exe C:\\Windows\\System32\\shimgvw.dll,ImageView_Fullscreen %s" ascii
		$s3 = "%s.jpg" ascii
		$s4 = "%s\\sz.txt" ascii
		$s5 = "ChromeSecsv9867%d7.exe" ascii
		$s6 = "%s\\appl%c.jpg" ascii

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

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"Software\\Microsoft\\Windows\\CurrentVersion"ascii
$s2text"rundll32.exe C:\\Windows\\System32\\shimgvw.dll,ImageView_Fullscreen %s"ascii
$s3text"%s.jpg"ascii
$s4text"%s\\sz.txt"ascii
$s5text"ChromeSecsv9867%d7.exe"ascii
$s6text"%s\\appl%c.jpg"ascii

Condition

uint16( 0 ) == 0x5a4d 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: 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: b0711427-b6bf-5e4b-af36-9c752ead4d6c

Tags:FILE

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