YARA · Trellix Advanced Research Center

TRELLIX_ARC_APT_Winnti

Detects Winnti variants

APT / acteurWinntiTrellix Advanced Research CenterApache License 2.0Compile avec YARA-X

Auteur: McAfee ATR Team
Date: 2020-06-04
Modifiée: 2020-10-14
Score / Qualité: 75 / 70

Ce que détecte cette règle

Detects Winnti variants

Famille de malware associée : Winnti.

Cibles : PE Windows.

Elle définit 1 motifs (0 texte, 1 hex, 0 regex).

Résumé généré à partir des métadonnées et de la condition de la règle.

Source de la règle

Télécharger .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
}

Chaînes (1 motifs)

Identifiant	Type	Valeur	Modificateurs
$pattern	hex	{ 9090909090909090909090909090C7????????????C2????90909090909081??????????E9????????CCCCCCCCCC8A??????8B??????538A??8A??568B??578B??????8B??C1????66????8B??C1?? …

Condition

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

En clair (Heuristique)

Le fichier doit commencer par « MZ » — un exécutable Windows (PE).
Le fichier doit faire moins de 400KB (garde-fou peu coûteux qui écarte les gros fichiers).
Tous les motifs de la règle doivent être trouvés.

Tester cette règle dans votre navigateur

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Déposez un fichier ici ou cliquez pour choisirScanné localement avec YARA-X. Fichiers jusqu’à 200 Mo.

Ouvrir dans l’éditeur

Références

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

Hashes d’échantillons

Hashes des échantillons listés par l’auteur dans les métadonnées de la règle (à rechercher dans votre plateforme de threat intelligence).

fd539d345821d9ac9b885811b1f642aa1817ba8501d47bc1de575f5bef2fbf9e

Licence et attribution

Auteur : McAfee ATR Team

Dépôt source : Trellix Advanced Research Center @ 1919562a59

Licence : Apache License 2.0 (licence du dépôt)

Règle d’origine

Reprise via YARA Forge 20260927, qui préfixe les noms de règles par la source et ajoute des champs meta normalisés.

Identifiant de règle: f12b039a-2508-580f-b777-428bbda2c666

Métadonnées

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

Tags:BACKDOOR FILE

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