YARA · Trellix Advanced Research Center

TRELLIX_ARC_Rtf_Bluetea_Builder

Rule to detect the RTF files created to distribute BlueTea trojan

MalwareBlueTeaTrellix Advanced Research CenterApache License 2.0Compila con YARA-X

Autor: Marc Rivero | McAfee ATR Team
Fecha: 2020-04-21
Modificada: 2020-08-14
Puntuación / Calidad: 75 / 70

Qué detecta esta regla

Rule to detect the RTF files created to distribute BlueTea trojan

Familia de malware asociada: BlueTea.

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

rtf-bluetea-builder.yarApache License 2.0

rule TRELLIX_ARC_Rtf_Bluetea_Builder : MALDOC FILE
{
	meta:
		description = "Rule to detect the RTF files created to distribute BlueTea trojan"
		author = "Marc Rivero | McAfee ATR Team"
		id = "20e4f7b2-b36c-5724-a3aa-4216ed6265ab"
		date = "2020-04-21"
		modified = "2020-08-14"
		reference = "https://blog.360totalsecurity.com/en/bluetea-action-drive-the-life-trojan-update-email-worm-module-and-spread-through-covid-19-outbreak/"
		source_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/malware/MALDOC_rtf_bluetea_builder.yar#L1-L30"
		license_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/LICENSE"
		hash = "4a3eeaed22342967a95302a4f087b25f50d61314facc6791f756dcd113d4f277"
		logic_hash = "6c4007fb7ef4819141db63050215dcbb3d2c17e7cdcdbb6cfb4f4b045bb5736b"
		score = 75
		quality = 70
		tags = "MALDOC, FILE"
		rule_version = "v1"
		malware_type = "maldoc"
		malware_family = "Maldoc:W32/BlueTea"
		actor_type = "Cybercrime"
		actor_group = "Unknown"

	strings:
		$sequence = { 7B??72??6631??????65666C616E6731??32??????????69??????????????67????36??75??32??????656666????35????????656666????????73??666462????33??35????????74??68????????68????????36??73??73??66??????68????????36??73??73??6662????5C646566??616E6731??33??5C646566??616E67666532??35????????656D656C616E6731??33??5C74??656D656C616E67666532??35????????656D656C616E6763????7B??666F6E74??62??????6630??????69??????????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??32??3630??30??????????30??30??30????????????73??4E6577??526F6D616E3B????0A????6631??5C6662????69??????????6C5C6663????72??6574??33????6670??71??7B??2A??????6E6F73??20??32??31??3630??30??30??30??30??30??30??7D??2763????2763????2763????276535????????66616C74??5369????????????7D??5C6633????6662????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??34??35????????30????3630??30??30????????????72??6120????74??3B????0A????6633??5C6662????69??????????69????????????6172??6574??5C6670??71??7B??2A??????6E6F73??20??32??6630??????????30??30????33??32??34??43616C69????????????5C6633??5C6662????69??????????6C5C6663????72??6574??33????6670??71??7B??2A??????6E6F73??20??32??31??3630??30??30??30??30??30??30??7D??5C2763????2763????2763????276535????????7B??666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??32??3630??30??????????30??30??30????????????73??4E6577??526F6D616E3B????5C666462????6A??72??6633??35????????62????69??????????6C5C6663????72??6574??33????6670??71??7B??2A??????6E6F73??20??32??31??3630??30??30??30??30??30??30??7D??2763????2763????2763????276535????????66616C74??5369????????????7D??0A????66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??34??35????????30????3630??30??30????????????72??613B????5C6662????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??32??3630??30??????????30??30??30????????????73??4E6577??526F6D616E3B????0A????666C6F6D69????????????31??????????62????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??32??3630??30??????????30??30??30????????????73??4E6577??526F6D616E3B????5C666462????6E6F72??6633??35????????62????69??????????6C5C6663????72??6574??33????6670??71??7B??2A??????6E6F73??20??32??31??3630??30??30??30??30??30??30??7D??2763????2763????2763????276535????????66616C74??5369????????????7D??0A????66??????69????????????31??????????62????69??????????69????????????6172??6574??5C6670??71??7B??2A??????6E6F73??20??32??6630??????????30??30????33??32??34??43616C69????????????5C6662????69????????????31??????????62????69??????????6D616E5C6663????72??6574??5C6670??71??7B??2A??????6E6F73??20??32??32??3630??30??????????30??30??30????????????73??4E6577??526F6D616E3B????5C6634??5C6662????69??????????6D616E5C6663????72??6574??33??5C6670??71??20??????6573??4E6577??526F6D616E20????3B????0A????6634??5C6662????69??????????6D616E5C6663????72??6574??30????6670??71??20??????6573??4E6577??526F6D616E20????72??7D??5C6634??5C6662????69??????????6D616E5C6663????72??6574??3631??????72??32??5469????????????77??526F6D616E20????6565??????7B??6634??5C6662????69??????????6D616E5C6663????72??6574??3632??????72??32??5469????????????77??526F6D616E20??????3B????5C6634??5C6662????69??????????6D616E5C6663????72??6574??37375C6670??71??20??????6573??4E6577??526F6D616E20??486562????77??3B????0A????6634??5C6662????69??????????6D616E5C6663????72??6574??3738??????72??32??5469????????????77??526F6D616E20??4172??62????29??7D??5C6634??5C6662????69??????????6D616E5C6663????72??6574??38??5C6670??71??20??????6573??4E6577??526F6D616E20????6C74??63??7D??5C6634??5C6662????69??????????6D616E5C6663????72??6574??3633??????72??32??5469????????????77??526F6D616E20??5669????????????73??29??7D??0A????6631??32??????69??????????????6C5C6663????72??6574??5C6670??71??20????6D5375??20????73??6572??7B??2A??????6C74??5369????????????7D??5C6633??30??????69??????????????6D616E5C6663????72??6574??33??5C6670??71??20????6D62????6120????74??20????3B????5C6633??31??????69??????????????6D616E5C6663????72??6574??30????6670??71??20????6D62????6120????74??20????72??7D??5C6633??33??????69??????????????6D616E5C6663????72??6574??3631??????72??32??43616D62????6120????74??20????6565??????0D????????33??34??6662????69??????????6D616E5C6663????72??6574??3632??????72??32??43616D62????6120????74??20??????3B????5C6633??375C6662????69??????????6D616E5C6663????72??6574??38??5C6670??71??20????6D62????6120????74??20????6C74??63??7D??5C6633??38??????69??????????????6D616E5C6663????72??6574??3633??????72??32??43616D62????6120????74??20??5669????????????73??29??7D??5C6634??30??????69??????????????69????????????6172??6574??33??5C6670??71??20????6C69????????????3B????0A????6634??31??????69??????????????69????????????6172??6574??30????6670??71??20????6C69????????????72??7D??5C6634??33??????69??????????????69????????????6172??6574??3631??????72??32??43616C69????????????6565??????7B??6634??34??6662????69??????????69????????????6172??6574??3632??????72??32??43616C69????????????72??7D??5C6634??375C6662????69??????????69????????????6172??6574??38??5C6670??71??20????6C69????????????6C74??63??7D??0A????6634??38??????69??????????????69????????????6172??6574??3633??????72??32??43616C69????????????69????????????73??29??7D??5C6634??32??????69??????????????6C5C6663????72??6574??5C6670??71??20????2763????2763????2763????276535????????74??72??3B????5C666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??33??5C6670??71??20??????6573??4E6577??526F6D616E20????3B????0A????666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??30????6670??71??20??????6573??4E6577??526F6D616E20????72??7D??5C666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3631??????72??32??5469????????????77??526F6D616E20????6565??????7B??666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3632??????72??32??5469????????????77??526F6D616E20??????3B????0A????666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??37375C6670??71??20??????6573??4E6577??526F6D616E20??486562????77??3B????5C666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3738??????72??32??5469????????????77??526F6D616E20??4172??62????29??7D??5C666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??38??5C6670??71??20??????6573??4E6577??526F6D616E20????6C74??63??7D??0A????666C6F6D616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3633??????72??32??5469????????????77??526F6D616E20??5669????????????73??29??7D??5C666462????6A??72??6633??35????????62????69??????????6C5C6663????72??6574??5C6670??71??20????6D5375??20????73??6572??7B??2A??????6C74??5369????????????7D??5C66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??33??5C6670??71??20????6D62????6120????3B????0A????66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??30????6670??71??20????6D62????6120????72??7D??5C66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3631??????72??32??43616D62????6120????6565??????7B??66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??3632??????72??32??43616D62????6120??????3B????0A????66??????616A??72??6633??35????????62????69??????????6D616E5C6663????72??6574??38??5C6670??71??20????6D62????6120????6C74??63??7D??5C66??????616A?? }

	condition:
		uint16( 0 ) == 0x5c7b and filesize < 100KB and all of them
}

Cadenas (1 patrones)

Identificador	Tipo	Valor	Modificadores
$sequence	hex	{ 7B??72??6631??????65666C616E6731??32??????????69??????????????67????36??75??32??????656666????35????????656666????????73??666462????33??35????????74??68?????? …

Condición

uint16( 0 ) == 0x5c7b and filesize < 100KB and all of them

En palabras sencillas (Heurística)

El archivo debe ocupar menos de 100KB (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://blog.360totalsecurity.com/en/bluetea-action-drive-the-life-trojan-update-email-worm-module-and-spread-through-covid-19-outbreak/

Hashes de muestras

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

4a3eeaed22342967a95302a4f087b25f50d61314facc6791f756dcd113d4f277

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: 20e4f7b2-b36c-5724-a3aa-4216ed6265ab

Metadatos

rule_version	v1
malware_type	maldoc
malware_family	Maldoc:W32/BlueTea
actor_type	Cybercrime
actor_group	Unknown

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