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YARA · Trellix Advanced Research Center

TRELLIX_ARC_Milum_Trojan

Rule to detect Milum trojan from the Wildpressure operation

MalwareMilumTrellix Advanced Research CenterApache License 2.0Compila con YARA-X
Autor
Marc Rivero | McAfee ATR Team
Fecha
2020-04-24
Modificada
2020-08-14
Puntuación / Calidad
75 / 70

Qué detecta esta regla

Rule to detect Milum trojan from the Wildpressure operation

Familia de malware asociada: Milum.

Objetivos: PE de Windows.

Define 1 patrones (0 de texto, 1 hex, 0 regex). Módulos YARA usados: pe.

Resumen generado a partir de los metadatos y la condición de la regla.

Código de la regla

Descargar .yar

Incluye los imports necesarios para compilarla por sí sola.

milum-trojan.yarApache License 2.0
import "pe"

rule TRELLIX_ARC_Milum_Trojan : TROJAN FILE
{
	meta:
		description = "Rule to detect Milum trojan from the Wildpressure operation"
		author = "Marc Rivero | McAfee ATR Team"
		id = "acc56237-a93a-55c0-a90c-11ca1da683db"
		date = "2020-04-24"
		modified = "2020-08-14"
		reference = "https://securelist.com/wildpressure-targets-industrial-in-the-middle-east/96360/"
		source_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/APT/APT_milum_wildpressure.yar#L3-L28"
		license_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/LICENSE"
		hash = "86456ebf6b807e8253faf1262e7a2b673131c80174f6133b253b2e5f0da442a9"
		logic_hash = "3ab1ff129517cb4a829edac289c00d7701d6f667ba2ef5a28024fd01a3a52e8e"
		score = 75
		quality = 70
		tags = "TROJAN, FILE"
		rule_version = "v1"
		malware_type = "trojan"
		malware_family = "Trojan:W32/Milum"
		actor_type = "Apt"
		actor_group = "Unknown"

	strings:
		$pattern = { 558B??6A??68????????64??????????5081??????????A1????????33??89????535657508D????64??????????8B????89??????????C7????????????8D????C7??????????33??6A??89??????????89????E8????????83????3B??0F84????????89????89??8B????89????8B????89????8B????C6??????8B????C6??????C6??????8B??????????BE????????89????89????88????C6??????6A??68????????8D??????????89??????????89??????????88??????????E8????????C6??????6A??538D????528D??????????89??????????89??????????88??????????E8????????C6??????8D??????????508B??E8????????508D??????????5157E8????????C6??????83????????????72??8B??????????52E8????????83????89??????????89??????????88??????????C6??????83????????????72??8B??????????50E8????????83????6A??68????????8D????89??????????89??????????88??????????89????89????88????E8????????C6??????6A??538D????518D????89????89????88????E8????????C6??????8D????528B??E8????????508D??????????5057E8????????C6??????83??????72??8B????51E8????????83????89????89????88????C6??????83??????72??8B????52E8????????83????6A??68????????8D????89????89????88????89????89????88????E8????????C6??????6A??538D????508D????89????89????88????E8????????C6??????83????8B??89??????????6A??89????89????68????????88??E8????????C6??????83????8B??89??????????6A??538D????89????89????5288??E8????????C6??????8D??????????50C6??????E8????????83????C6??????8B??????????2B??????????B8????????F7??03??C1????8B??C1????03??83????75??8B??????????6A??53528D????E8????????8B??????????6A??83????53508D????E8????????6A??538D????508D????89????89????88????E8????????C6??????6A??538D????518D????89????89????88????E8????????C6??????8D????528B??E8????????508D??????????5057E8????????C6??????BF????????39????72??8B????51E8????????83????89????89????88????C6??????39????72??8B????52E8????????83????89????89????88????C6??????8B??????????3B??74??8B??????????E8????????8B??????????50E8????????83????BF????????89??????????89??????????89??????????C6??????39????72??8B????51E8????????83????89????89????88????C6??????39????72??8B????52E8????????83????89????89????88????C6??????39????72??8B????50E8????????83????89????89????88????88????39????72??8B????51E8????????83????89????89????88????C7????????????39????72??8B????52E8????????83????8B??????????89????89????88????8B????64????????????595F5E5B8B????33??E8????????8B??5DC2????8D??????????508D??????????89??????????E8????????C6??????C7??????????????????C6??????68????????8D??????????51E8????????CCCC558B??6A??68????????64??????????5051535657A1????????33??508D????64??????????8B????C7??????????C7????????????8D????33??83??????89????72??8B??EB??8B??8D????88??8B????8B????518B??E8????????8B????89????8B????89??8B????89????89????88????83??????72??8B??50E8????????83????89????C7????????????88??83????89????89????C7????????????8B????8B??50518D????E8????????89????8B????52E8????????83????8B????64????????????595F5E5B8B??5DC2????CCCCCCCCCCCCCCCCCCCCCCCCCC558B??6A??68????????64??????????505156A1????????33??508D????64??????????83????C7????????????8B????5156E8????????C7????????????C7????????????8B??8B????64????????????595E8B??5DC2????CCCCCCCCCCCC558B??6A??68????????64??????????5081??????????A1????????33??89????535657508D????64??????????8B????33??8B??89??????????8B????8B??89??????????89??????????89??????????3B??0F84????????8D????39??????????0F85????????68????????8D????5750E8????????C7????????????83????8D????57518B??E8????????83????C6??????8B??????????6A??535083????E8????????C6??????BF????????39????72??8B????52E8????????83????C7????????????89????88????88????39????72??8B????50E8????????83????C7????????????89????88????E9????????578D????68????????51E8????????C7????????????508D??????????52BA????????E8????????C6??????83????8D????57518B??E8????????83????C6??????8B??????????6A??535083????E8????????C6??????BF????????39????72??8B????52E8????????83????C7????????????89????88????C6??????39??????????72??8B??????????50E8????????83????C7??????????????????89??????????88??????????88????39????72??8B????51E8????????83????C7????????????89????88????FF??????????38????75??8B????38????75??8B??8B??38????75??8D????8B??8B??38????74??EB??8B????38????75??3B????75??8B??8B????38????74??8B??8B??????????3B????0F85????????8B??????????8B??6A??5383????C7????????????89????508B??88??E8????????89????C7??????????????????8B??8B????64????????????595F5E5B8B????33??E8????????8B??5DC2????CCCCCCCCCCCCCCCCCCCCCCCCCCCC558B??6A??68????????64??????????50515356A1????????33??508D????64??????????8B??89????C7??????????33??89????83??????72??8B????50E8????????83????C7????????????89????88????C7????????????83??????72??8B????50E8????????83????C7????????????89????88????8B????64????????????595E5B8B??5DC3CCCCCCCCCC558B??6A??68????????64??????????5083????A1????????33??89????5356508D????64??????????33??89????538B??68????????8D????89????C7????????????89????88????E8????????C7????????????6A??8D????38????74??68????????EB??68????????E8????????8D????5083????8D????5651E8????????C6??????8D????52578B??E8????????83????C7????????????C6??????BE????????39????72??8B????50E8????????83????C7????????????89????88????88????39????72??8B????51E8????????83????C7????????????89????88????8B??8B????64????????????595E5B8B????33??E8????????8B??5DC3CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC558B??6A??68????????64??????????50515356A1????????33??508D????64??????????8B??89????C7??????????33??89????83??????72??8B????50E8????????83????C7????????????89????88????C7????????????83??????72??8B????50E8????????83????F6??????C7????????????89????88????74??56E8????????83????8B??8B????64????????????595E5B8B??5DC2????CCCC558B??6A??68????????64??????????50A1????????33??508D????64??????????C7????????????6A??6A??8D????5083????E8????????C7????????????83??????72??8B????51E8????????83????C7????????????C7????????????C6??????8B????64????????????598B??5DC2????CCCCCCCCCCCCCCCCCCCCCC558B??6A??68????????64??????????5083????A1????????33??89????535657508D????64??????????33??89????8B????89????89????B8????????89????C7????????????89????88??89????8D????BF????????39????72??8B??8B????39????73??8D????8B????518D????518B??E8????????C6??????508B??E8????????C6??????39????72??8B????52E8????????83????C7????????????89????88????88????39????72??8B????50E8????????83????C7????????????89????88????8B??8B????64????????????595F5E5B8B????33??E8????????8B??5DC2????CCCCCCCCCCCCCCCC558B??6A??68????????64??????????5081??????????A1????????33??89????535657508D????64??????????8B??33??89????8B????89??????????89?????????? }

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 2000KB and pe.imphash ( ) == "548d9f5f1e74f34b85612667335d41f2" and all of them
}

Cadenas (1 patrones)

IdentificadorTipoValorModificadores
$patternhex{ 558B??6A??68????????64??????????5081??????????A1????????33??89????535657508D????64??????????8B????89??????????C7????????????8D????C7??????????33??6A??89?????? …

Condición

uint16( 0 ) == 0x5a4d and filesize < 2000KB and pe.imphash ( ) == "548d9f5f1e74f34b85612667335d41f2" and all of them

En palabras sencillas (Heurística)

  • El archivo debe empezar por «MZ»: un ejecutable de Windows (PE).
  • El archivo debe ocupar menos de 2000KB (un límite barato que descarta archivos grandes).
  • Deben coincidir todos los patrones de la regla.
  • Usa el módulo pe.
  • Comprueba el hash de importaciones PE (imphash).

Prueba esta regla en tu navegador

Arrastra un archivo para escanearlo con esta regla usando YARA-X compilado a WebAssembly. No se sube nada.

Arrastra un archivo aquí o haz clic para elegirSe escanea en local con YARA-X. Archivos de hasta 200 MB.

Abrir en el editor

Referencias

Hashes de muestras

Hashes de las muestras que el autor lista en los metadatos de la regla (búscalos en tu plataforma de threat intelligence).

  • 86456ebf6b807e8253faf1262e7a2b673131c80174f6133b253b2e5f0da442a9

Licencia y atribución

Autor: Marc Rivero | McAfee ATR Team

Repositorio de origen: Trellix Advanced Research Center @ 1919562a59

Licencia: Apache License 2.0 (licencia del repositorio)

Regla original

Obtenida a través de YARA Forge 20260927, que añade a los nombres el prefijo de la fuente y campos meta normalizados.

Id de la regla: acc56237-a93a-55c0-a90c-11ca1da683db

Metadatos

rule_versionv1
malware_typetrojan
malware_familyTrojan:W32/Milum
actor_typeApt
actor_groupUnknown

Etiquetas:TROJANFILE

Reglas relacionadas

Más reglas de Milum