YARA · ESET malware-ioc

ESET_IIS_Group02

Detects Group 2 native IIS malware family

MalwareESET malware-iocBSD 2-Clause LicenseCompila con YARA-X

Autor: ESET Research
Fecha: 2021-08-04
Puntuación / Calidad: 75 / 76

Qué detecta esta regla

Detects Group 2 native IIS malware family

Define 6 patrones (6 de texto, 0 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 y 1 regla(s) de las que depende necesarios para compilarla por sí sola.

iis-group02.yarBSD 2-Clause License

import "pe"

private rule ESET_IIS_Native_Module_PRIVATE : FILE
{
	meta:
		description = "Signature to match an IIS native module (clean or malicious)"
		author = "ESET Research"
		id = "e3bacdc8-fde1-5e83-ac94-79fc345e888d"
		date = "2021-08-04"
		modified = "2021-08-04"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/badiis/badiis.yar#L34-L92"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "5a388dc3253df606e2648d1f9c018e6dde373bbddce66dba69b7aecdd95bac18"
		score = 75
		quality = 55
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$e1 = "This module subscribed to event"
		$e2 = "CHttpModule::OnBeginRequest"
		$e3 = "CHttpModule::OnPostBeginRequest"
		$e4 = "CHttpModule::OnAuthenticateRequest"
		$e5 = "CHttpModule::OnPostAuthenticateRequest"
		$e6 = "CHttpModule::OnAuthorizeRequest"
		$e7 = "CHttpModule::OnPostAuthorizeRequest"
		$e8 = "CHttpModule::OnResolveRequestCache"
		$e9 = "CHttpModule::OnPostResolveRequestCache"
		$e10 = "CHttpModule::OnMapRequestHandler"
		$e11 = "CHttpModule::OnPostMapRequestHandler"
		$e12 = "CHttpModule::OnAcquireRequestState"
		$e13 = "CHttpModule::OnPostAcquireRequestState"
		$e14 = "CHttpModule::OnPreExecuteRequestHandler"
		$e15 = "CHttpModule::OnPostPreExecuteRequestHandler"
		$e16 = "CHttpModule::OnExecuteRequestHandler"
		$e17 = "CHttpModule::OnPostExecuteRequestHandler"
		$e18 = "CHttpModule::OnReleaseRequestState"
		$e19 = "CHttpModule::OnPostReleaseRequestState"
		$e20 = "CHttpModule::OnUpdateRequestCache"
		$e21 = "CHttpModule::OnPostUpdateRequestCache"
		$e22 = "CHttpModule::OnLogRequest"
		$e23 = "CHttpModule::OnPostLogRequest"
		$e24 = "CHttpModule::OnEndRequest"
		$e25 = "CHttpModule::OnPostEndRequest"
		$e26 = "CHttpModule::OnSendResponse"
		$e27 = "CHttpModule::OnMapPath"
		$e28 = "CHttpModule::OnReadEntity"
		$e29 = "CHttpModule::OnCustomRequestNotification"
		$e30 = "CHttpModule::OnAsyncCompletion"
		$e31 = "CGlobalModule::OnGlobalStopListening"
		$e32 = "CGlobalModule::OnGlobalCacheCleanup"
		$e33 = "CGlobalModule::OnGlobalCacheOperation"
		$e34 = "CGlobalModule::OnGlobalHealthCheck"
		$e35 = "CGlobalModule::OnGlobalConfigurationChange"
		$e36 = "CGlobalModule::OnGlobalFileChange"
		$e37 = "CGlobalModule::OnGlobalApplicationStart"
		$e38 = "CGlobalModule::OnGlobalApplicationResolveModules"
		$e39 = "CGlobalModule::OnGlobalApplicationStop"
		$e40 = "CGlobalModule::OnGlobalRSCAQuery"
		$e41 = "CGlobalModule::OnGlobalTraceEvent"
		$e42 = "CGlobalModule::OnGlobalCustomNotification"
		$e43 = "CGlobalModule::OnGlobalThreadCleanup"
		$e44 = "CGlobalModule::OnGlobalApplicationPreload"

	condition:
		uint16( 0 ) == 0x5A4D and pe.exports ( "RegisterModule" ) and any of ( $e* )
}

rule ESET_IIS_Group02
{
	meta:
		description = "Detects Group 2 native IIS malware family"
		author = "ESET Research"
		id = "945e3748-1072-55f3-abaa-903dfc250294"
		date = "2021-08-04"
		modified = "2021-08-04"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/badiis/badiis.yar#L134-L155"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "3fa2b8fed3c580f446b55412a920a5cfed2317b06aa93d059e9f89fdbec8f683"
		score = 75
		quality = 76
		tags = ""
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$s1 = "HttpModule.pdb" ascii wide
		$s2 = "([\\w+%]+)=([^&]*)"
		$s3 = "([\\w+%]+)=([^!]*)"
		$s4 = "cmd.exe"
		$s5 = "C:\\Users\\Iso\\Documents\\Visual Studio 2013\\Projects\\IIS 5\\x64\\Release\\Vi.pdb" ascii wide
		$s6 = "AVRSAFunction"

	condition:
		ESET_IIS_Native_Module_PRIVATE and 3 of ( $s* )
}

Cadenas (6 patrones)

Identificador	Tipo	Valor	Modificadores
$s1	texto	"HttpModule.pdb"	ascii wide
$s2	texto	"([\\w+%]+)=([^&]*)"
$s3	texto	"([\\w+%]+)=([^!]*)"
$s4	texto	"cmd.exe"
$s5	texto	"C:\\Users\\Iso\\Documents\\Visual Studio 2013\\Projects\\IIS 5\\x64\\Release\\Vi.pdb"	ascii wide
$s6	texto	"AVRSAFunction"

Condición

ESET_IIS_Native_Module_PRIVATE and 3 of ( $s* )

En palabras sencillas (Heurística)

Deben coincidir al menos 3 patrones de ( $s* ).
Depende de la regla ESET_IIS_Native_Module_PRIVATE.

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Referencias

https://github.com/eset/malware-ioc/

Licencia y atribución

Autor: ESET Research

Repositorio de origen: ESET malware-ioc @ 17baf44964

Licencia: BSD 2-Clause License (indicada en los metadatos de la regla)

“BSD 2-Clause”

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: 945e3748-1072-55f3-abaa-903dfc250294

Metadatos

version	1

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