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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_Fatduke

Detects FatDuke

MalwareFatdukeditekSHen 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 FatDuke

Associated malware family: Fatduke.

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-fatduke.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Fatduke : FILE
{
	meta:
		description = "Detects FatDuke"
		author = "ditekSHen"
		id = "dc80c0f0-c61c-5f0c-841b-3a75e8a1cef3"
		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#L3931-L3946"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "a7923d15b10098e9402614fe7107a6ba1d71512efa6e462d522ef64e13f82b47"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "\\\\?\\Volume" fullword ascii
		$s2 = "WINHTTP_AUTOPROXY_OPTIONS@@PAUWINHTTP_PROXY_INFO@@" ascii
		$s3 = "WINHTTP_CURRENT_USER_IE_PROXY_CONFIG@@" ascii
		$s4 = "Cannot write a Cannot find the too long string mber of records Log malfunction! Cannot create ain an invalid ra Internal sync iright function iWaitForSingleObjffsets" ascii
		$pattern = "()$^.*+?[]|\\-{},:=!" ascii
		$b64 = "eyJjb25maWdfaWQiOi" wide

	condition:
		uint16( 0 ) == 0x5a4d and ( 3 of ( $s* ) or ( $b64 and 2 of them ) or ( #pattern > 3 and 2 of them ) )
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"\\\\?\\Volume"fullword ascii
$s2text"WINHTTP_AUTOPROXY_OPTIONS@@PAUWINHTTP_PROXY_INFO@@"ascii
$s3text"WINHTTP_CURRENT_USER_IE_PROXY_CONFIG@@"ascii
$s4text"Cannot write a Cannot find the too long string mber of records Log malfunction! Cannot create ain an invalid ra Internal sync iright function iWaitForSingleObj …ascii
$patterntext"()$^.*+?[]|\\-{},:=!"ascii
$b64text"eyJjb25maWdfaWQiOi"wide

Condition

uint16( 0 ) == 0x5a4d and ( 3 of ( $s* ) or ( $b64 and 2 of them ) or ( #pattern > 3 and 2 of them ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 3 patterns in ( $s* ) must match.
  • At least 2 patterns in the rule must match.
  • Pattern $pattern must occur > 3 times.
  • Pattern $b64 must be present.

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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: dc80c0f0-c61c-5f0c-841b-3a75e8a1cef3

Tags:FILE

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