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DITEKSHEN_MALWARE_Win_Karaganyscreenutil

Detects Karagany/xFrost ScreenUtil module

MalwareKaraganyscreenutilditekSHen 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 Karagany/xFrost ScreenUtil module

Associated malware family: Karaganyscreenutil.

Targets: Windows PE.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-karaganyscreenutil.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Karaganyscreenutil : FILE
{
	meta:
		description = "Detects Karagany/xFrost ScreenUtil module"
		author = "ditekSHen"
		id = "5eab1bb9-a433-54e6-963b-4aca863dc73f"
		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#L3043-L3055"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "d10230d94adfdddd604e2569ae3323efa1d5722647b9c704fceefe9446ccebd1"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "__pic__" ascii wide
		$s2 = "__pickill__" ascii wide
		$s3 = "\\picture.png" fullword wide
		$s4 = "%d.jpg" wide
		$s5 = "\\Update\\Tmp" wide

	condition:
		uint16( 0 ) == 0x5a4d and 4 of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"__pic__"ascii wide
$s2text"__pickill__"ascii wide
$s3text"\\picture.png"fullword wide
$s4text"%d.jpg"wide
$s5text"\\Update\\Tmp"wide

Condition

uint16( 0 ) == 0x5a4d and 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 4 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: 5eab1bb9-a433-54e6-963b-4aca863dc73f

Tags:FILE

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