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DITEKSHEN_MALWARE_Win_Bulz01

Detects trojan loader

MalwareBulz01ditekSHen 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 trojan loader

Associated malware family: Bulz01.

Targets: Windows PE.

It defines 1 patterns (1 text, 0 hex, 0 regex). YARA modules used: pe.

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

malware-win-bulz01.yarBSD 2-Clause License
import "pe"

rule DITEKSHEN_MALWARE_Win_Bulz01 : FILE
{
	meta:
		description = "Detects trojan loader"
		author = "ditekSHen"
		id = "4ac4125b-70f5-5cda-ae45-fd5713e25a6e"
		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#L2271-L2281"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "29884dda4936016660f5d1e33ffcf97a20c7d3116483a5895a5e2a1dd4ac9e9f"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "DisableTrivet.dll" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and pe.is_dll ( ) and all of ( $s* ) and ( pe.exports ( "Ordinal" ) or pe.exports ( "Chechako" ) or pe.exports ( "Originator" ) or pe.exports ( "Repressions" ) )
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$s1text"DisableTrivet.dll"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and pe.is_dll ( ) and all of ( $s* ) and ( pe.exports ( "Ordinal" ) or pe.exports ( "Chechako" ) or pe.exports ( "Originator" ) or pe.exports ( "Repressions" ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in ( $s* ) must match.
  • Uses the pe module.
  • Checks exported functions or the DLL name.
  • Requires a DLL.

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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: 4ac4125b-70f5-5cda-ae45-fd5713e25a6e

Tags:FILE

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