YARA · Trellix Advanced Research Center

TRELLIX_ARC_APT_Winnti

Detects Winnti variants

APT / actorWinntiTrellix Advanced Research CenterApache License 2.0Compila con YARA-X

Autor: McAfee ATR Team
Fecha: 2020-06-04
Modificada: 2020-10-14
Puntuación / Calidad: 75 / 70

Qué detecta esta regla

Detects Winnti variants

Familia de malware asociada: Winnti.

Objetivos: PE de Windows.

Define 1 patrones (0 de texto, 1 hex, 0 regex).

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

Código de la regla

Descargar .yar

apt-winnti.yarApache License 2.0

rule TRELLIX_ARC_APT_Winnti : BACKDOOR FILE
{
	meta:
		description = "Detects Winnti variants"
		author = "McAfee ATR Team"
		id = "f12b039a-2508-580f-b777-428bbda2c666"
		date = "2020-06-04"
		modified = "2020-10-14"
		reference = "https://attack.mitre.org/software/S0141/"
		source_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/APT/APT_winnti.yar#L1-L27"
		license_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/LICENSE"
		hash = "fd539d345821d9ac9b885811b1f642aa1817ba8501d47bc1de575f5bef2fbf9e"
		logic_hash = "f94b2c552fbb30e1005e5c75a2f449d60b9558a0916197bed41bf32c6477daef"
		score = 75
		quality = 70
		tags = "BACKDOOR, FILE"
		rule_version = "v1"
		malware_type = "backdoor"
		malware_family = "Backdoor:W32/Winnti"
		actor_type = "Apt"
		actor_group = "Unknown"

	strings:
		$pattern = { 9090909090909090909090909090C7????????????C2????90909090909081??????????E9????????CCCCCCCCCC8A??????8B??????538A??8A??568B??578B??????8B??C1????66????8B??C1????F3AB8B??83????F3AA8B??5F5E5BC390909090909090909090909090909083????5333??568D??????535089??????89??????E8????????8A??33??3A??8D??????0F94??83????5389??????528B??89??????C6????????E8????????8B??33??81??????????8D??????0F94??6A??89??????5223??89??????C6????????C6????????E8????????33??66????8D??????6A??0F94??89??????89??????5223??C6????????C6????????E8????????8B??83????33??3B??0F94??23??5E495BF7??1B??8B??83????C38B??????8B??????03??C390909090908B??????85??0F84????????8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??8B??????83????74??83????75??E9????????83????C39090909090909090909090909083????8B??????53558B??????33??568B??????83????5789??????76??81??????????8B??76??BF????????8B??????8D????03??C1????03??89??????3B??76??8B??????68????????6A??52E8????????8B??????8B??????8B??????505351565752E8????????8B??????8B??8B??????2B??8B??83????03??8B??????83????89??????77??03??0F84????????8B??????8B??????2B??03??3B??89??????75??81??????????77??8A??04??EB??83????77??08????EB??83????77??8A??80????88??EB??8D????C6????463D????????89??????76??8D????B8????????F7??C1????8B??33??8B??8B??C1????F3AB8B??83????03??F3AA8B??????81??????????4A89??????75??8B??????8B??88??468A??88??46424B75??8B??????C6????465FC6????46C6????2B??8B??????4633??89??5E5D5B83????C390909090909090909083????8B??????53558B??????568B??????8D????5789??????8B??????83????73??B8????????2B??EB??33??03??8B??2B??C1????8D??????89??????8B??????8B??????8D????3B??0F83????????8B??8B??69??????????8B??????8B??????C1????33??66??????03??8B??????2B??????89??????66??????8B??3B??0F85????????8B??????C7??????????????2B??8B??????8B??2B??0F84????????83????77??8A????0A??88????8B????89??03??E9????????83????77??8A??2C??88??468B????89??8B????89????8B????89????8B????89????03??E9????????83????77??8A??80????88??46EB??8D????C6????463D????????89??????76??8D????B8????????F7??8B??33??C1????89??????8B??8B??C1????F3AB8B??83????F3AA8B??03??8B??????81??????????4889??????75??8B??????8B??8B??????88??468B????89??8B????89????8B????89????8B????89????83????83????83????83????73??85??76??8A????88??46454B75??BB????????8B????8B????33??75??BB????????03??8B????8B??33??8B??????83????3B??73??8B??2B??????85??75??83????83????8B????8B??33??8B??????3B??72??EB??84??75??C1????4384??74??8B??????8B??03??2B??83????89??????77??3D????????77??4880????8A??80????C0????C0????0A??88??46C1????88??46E9????????3D????????77??4883????89??????77??80????80????EB??83????C6????4681??????????76??8D????B8????????F7??8B??33??C1????89??????8B??8B??C1????F3AB8B??83????F3AA8B??03??81??????????4875??8B??????88??8A??46C0????88??46C1????88??46E9????????2D????????83????89??????77??8B??80????C1????80????8A??0A??80????88??46C0????88??46C1????88??46E9????????8B??83????C1????80????80????88??4681??????????76??8D????B8????????F7??8B??33??C1????89??????8B??8B??C1????F3AB8B??83????F3AA8B??03??81??????????4875??8B??????88??8A??46C0????88??46C1????88??46E9????????8B??????E9????????8B??????8B??????8B??????2B??89??8B??5F2B??5E5D03??5B83????C390909090909090909090908B??????538B??????55568B??????C7??????????578A??8D????8B??????80????8B??76??81??????????8D????83????8B??83????0F82????????8A??88??40414F75??EB??33??8A??418B??83????0F83????????85??75??80????75??8A????81??????????4184??74??33??8A??418D??????8B??89??83????83????4E74??83????72??8B??89??83????83????83????83????73??85??76??8A??88??40414E75??EB??8A??88??40414E75??33??8A??418B??83????73??33??8B??8A??C1????2B??C1????2B??8A??????????81??????????4188??40478A??88??8A????4088??408A????83????8B??0F84????????8A??88??404183????76??8A??88??404183????76??8A??88??404133??8A??418B??83????72??8B??8B??C1????83????2B??33??8A??C1????2B??4F41C1????4E8A??88??8A????404788??40478A??88??40474E75??EB??83????72??83????75??80????75??8A????81??????????4184??74??33??8A??418D??????8D????66????81??????????C1????2B??83????EB??83????0F82????????8B??8B??83????C1????2B??83????75??80????75??8A????81??????????4184??74??33??8A??418D??????66????81??????????C1????2B??83????3B??74??81??????????83????0F82????????8B??2B??83????0F8C????????8B??89??83????83????83????8B??89??83????83????83????83????73??85??0F86????????8A??88??40474E75??E9????????33??8B??8A??C1????2B??C1????2B??4F41E9????????8B??????2B??3B??89??75??5F5E5D33??5BC31B??5F24??5E5D83????5BC39090909090909090909090909081??????????568B??68????????C7??????????FF??????????83????75??57B9????????33??8D??????66????????????F3AB66AB8D??????5068????????FF??????????83????5F75??6A??68????????FF??????????8B??5E81??????????C390909090909090909090909090568B??E8????????F6????????74??56E8????????83????8B??5EC2????909068????????C7??????????FF??????????85??75??FF??????????C39090909053558B??????5685??5774??8B??????85??74??33??33??33??85??76??8A??????????8A??????????32??80????32??8A????32??33??88????8D????BE????????F7??8D????BF????????8B??33??F7??413B??8B??72??5F5E5D5BC39083????538B??????55565768????????68????????5333??FF??????????8B??85??0F84????????68????????FF??????????8B??B0??88??????88??????8D??????B1??5056C6????????88??????C6????????C6????????C6????????C6????????88??????C6????????C6????????C6????????C6????????FF??????????5753FF??568B??FF??????????85??74??57FF??????????8B??8B??????B9????????8B??68????????50F3A5E8????????83????B8????????5F5E5D5B83????C35F8B??5E5D5B83????C39090538B??????????5657C7??????????8D????BF???????? }

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 400KB and all of them
}

Cadenas (1 patrones)

Identificador	Tipo	Valor	Modificadores
$pattern	hex	{ 9090909090909090909090909090C7????????????C2????90909090909081??????????E9????????CCCCCCCCCC8A??????8B??????538A??8A??568B??578B??????8B??C1????66????8B??C1?? …

Condición

uint16( 0 ) == 0x5a4d and filesize < 400KB 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 400KB (un límite barato que descarta archivos grandes).
Deben coincidir todos los patrones de la regla.

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

https://attack.mitre.org/software/S0141/

Hashes de muestras

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

fd539d345821d9ac9b885811b1f642aa1817ba8501d47bc1de575f5bef2fbf9e

Licencia y atribución

Autor: 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: f12b039a-2508-580f-b777-428bbda2c666

Metadatos

rule_version	v1
malware_type	backdoor
malware_family	Backdoor:W32/Winnti
actor_type	Apt
actor_group	Unknown

Etiquetas:BACKDOOR FILE

SIGNATURE_BASE_APT_Winnti_MAL_Dec19_1
APT / actorSignature Base (Florian Roth / Nextron)· Unknown· 2019-12-06
SIGNATURE_BASE_APT_Winnti_MAL_Dec19_2
APT / actorSignature Base (Florian Roth / Nextron)· Unknown· 2019-12-06
SIGNATURE_BASE_APT_Winnti_MAL_Dec19_3
APT / actorSignature Base (Florian Roth / Nextron)· Unknown· 2019-12-06
SIGNATURE_BASE_APT_Winnti_MAL_Dec19_4
APT / actorSignature Base (Florian Roth / Nextron)· Unknown· 2019-12-06
SIGNATURE_BASE_APT_Winnti_MAL_Dec19_5
APT / actorSignature Base (Florian Roth / Nextron)· Unknown· 2019-12-06
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Herramienta ofensivaSignature Base (Florian Roth / Nextron)· mirar@chaosmail.org· 2020-06-22
MALPEDIA_Win_Winnti_Auto
MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
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APT / actorTrellix Advanced Research Center· Marc Rivero | McAfee ATR Team· 2020-07-24

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