YARA · Trellix Advanced Research Center

TRELLIX_ARC_Nemty_Ransomware_2_6

Rule to detect Nemty Ransomware version 2.6

MalwareNemtyTrellix Advanced Research CenterApache License 2.0Compile avec YARA-X

Auteur: Marc Rivero | McAfee ATR Team
Date: 2020-04-06
Modifiée: 2020-08-14
Score / Qualité: 75 / 70

Ce que détecte cette règle

Rule to detect Nemty Ransomware version 2.6

Famille de malware associée : Nemty.

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

nemty-ransomware-2-6.yarApache License 2.0

rule TRELLIX_ARC_Nemty_Ransomware_2_6 : RANSOMWARE FILE
{
	meta:
		description = "Rule to detect Nemty Ransomware version 2.6"
		author = "Marc Rivero | McAfee ATR Team"
		id = "335dff33-d078-58ba-b68b-a949895b710f"
		date = "2020-04-06"
		modified = "2020-08-14"
		reference = "https://www.mcafee.com/blogs/other-blogs/mcafee-labs/nemty-ransomware-learning-by-doing/"
		source_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/ransomware/RANSOM_Nemty.yar#L47-L80"
		license_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/LICENSE"
		hash = "52b7d20d358d1774a360bb3897a889e14d416c3b2dff26156a506ff199c3388d"
		logic_hash = "dacf709838ef2ef65d25bdbbd92007ab46a95953031d7bee75eac046f670171a"
		score = 75
		quality = 70
		tags = "RANSOMWARE, FILE"
		rule_version = "v1"
		malware_type = "ransomware"
		malware_family = "Ransom:W32/Nemty"
		actor_type = "Cybercrime"
		actor_group = "Unknown"

	strings:
		$pattern = { 558B??83????53565789????29????6A??8D????8D????5A8B??89????8A????88????8B????8A????88??8A????88????8A??88????03??03??FF????75??89????8D????8D????8D????89????89????29????89????29????89????29????8D????8D????89????29????89????29????8B????89????29????8D????F6??????8B????8A????8B????8A????8A??88????8B????8A????88????75??0FB6??8A??????????0FB6??88????8A??????????0FB6????8A??????????88????0FB6????8A??????????88????8B????C1????32??????????8B????8A????32??8B????88????8A????32??88????8A??32????83????88????8B????8A????32????FF????88??83????83????83??????0F82????????5F5E5BC9C3558B??560FB6??57C1????03????6A??5F6A??5E8A??30??40414E75??4F75??5F5E5DC356576A??5F6A??8B??5E0FB6??8A??????????88??83????4E75??414F75??5F5EC38A????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????8A????88????88????C3558B??5153566A??83????5E8A????32??8A????8A????88????32??32??88????88????32??8A??C0????B3??F6??02??32??32????8A????32????32??88????8A??C0????F6??02??32??32????8A????32????88????8A??C0????F6??02??32??32??8A????32????32????88??8A??C0????F6??02??32??32????83????32????4E88????75??5E5BC9C3558B??53FF????8B??32??E8????????59B3??8B??E8????????8B??E8????????8B??E8????????FF????8B??8A??E8????????FE??5980????72??8B??E8????????8B??E8????????5B8B??B0??5DE9????????558B??81??????????A1????????33??89????8B????578D??????????89??????????E8????????33??6A??5839????76??5683????75??508D????5350E8????????8D??????????508D????E8????????83????6A??5880??????75??C6??????4879??EB??FE????33??8A??????8B??????????30????47403B????72??5E8B????33??5FE8????????C9C3558B??51515333??5633??32??89????39????0F86????????578B????8B????8A????8B??83????74??4F74??4F75??21????0FB6??0FB6??83????8B??C1????C1????0B??8A??????????83????88????8A??????????8B????88??????83????EB??0FB6??0FB6??83????6A??C1????C1????5E0B??EB??33??0FB6??46C1????8A??????????88????40FF????8A??8B????3B????72??5F4E74??4E75??0FB6??83????8A????????????88????C6????????83????EB??0FB6??83????C1????8A??????????88????66????????????83????5EC6??????5BC9C3558B??33??F6??????75??5733??39????76??8B????8A????80????74??80????7C??80????7F??0FB6??8A??????????80????74??8B??83????83????74??4A74??4A74??4A75??08????40EB??8A??C0????80????08????40C0????EB??8A??C0????80????08????40C0????EB??C0????88????473B????72??EB??33??5F5DC3558B??518B??85??74??8B????568B??89????3B??74??576A??33??E8????????83????3B????75??5FFF??E8????????595E33??89??89????89????C9C3558B??80??????74??83??????72??538B??85??74??575356E8????????83????53E8????????595BC7????????????89????C6??????5DC2????C7??????????E9????????558B??568B??C7??????????E8????????F6??????74??56E8????????598B??5E5DC2????558B??83????81??????????A1????????33??89????????????5356578D????508D??????E8????????68????????8D????????????E8????????6A??5F33??83????66????????8D????8B??33??5089??????89??????E8????????E8????????33??66????????8B????????????03??????83????8D??????89??????89??????E8????????538D??????5083????8D??????E8????????538D????????????5083????E8????????8B??8D??????E8????????6A??33??E8????????83????????8B??????73??8D??????8D????????????5150FF??????????89??????83????0F84????????8B??????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????68????????8D????????????50FF??85??0F84????????F6??????????????8D????????????508D??????8D??????74??E8????????598D??????51E8????????8B??598D??????E8????????6A??33??8D??????E8????????6A??8D??????E8????????83????8D??????8B??50E8????????E8????????83????E9????????E8????????8B??598D??????E8????????6A??33??8D??????E8????????8D????????????50FF??????????508D??????E8????????8B??????6A??5F39??????73??8D??????8B??????????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??0F84????????8B??????39??????73??8D??????68????????50FF??85??74??8B??????39??????73??8D??????68????????50FF??85??74??83????8B??68????????E8????????83????8D????????????8B??51E8????????E8????????83????85??75??8B??????39??????73??8D??????83????8B??51E8????????E8????????83????6A??33??8D??????E8????????8D????????????50FF??????FF??????????85??0F85????????FF??????FF??????????33??435333??8D?????? }

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 1500KB and $pattern
}

Chaînes (1 motifs)

Identifiant	Type	Valeur	Modificateurs
$pattern	hex	{ 558B??83????53565789????29????6A??8D????8D????5A8B??89????8A????88????8B????8A????88??8A????88????8A??88????03??03??FF????75??89????8D????8D????8D????89????89 …

Condition

uint16( 0 ) == 0x5a4d and filesize < 1500KB and $pattern

En clair (Heuristique)

Le fichier doit commencer par « MZ » — un exécutable Windows (PE).
Le fichier doit faire moins de 1500KB (garde-fou peu coûteux qui écarte les gros fichiers).
Le motif $pattern doit être présent.

Tester cette règle dans votre navigateur

Déposez un fichier pour le scanner avec cette règle grâce à YARA-X compilé en WebAssembly. Rien n’est envoyé.

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

Ouvrir dans l’éditeur

Références

https://www.mcafee.com/blogs/other-blogs/mcafee-labs/nemty-ransomware-learning-by-doing/

Hashes d’échantillons

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

52b7d20d358d1774a360bb3897a889e14d416c3b2dff26156a506ff199c3388d

Licence et attribution

Auteur : Marc Rivero | 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: 335dff33-d078-58ba-b68b-a949895b710f

Métadonnées

rule_version	v1
malware_type	ransomware
malware_family	Ransom:W32/Nemty
actor_type	Cybercrime
actor_group	Unknown

Tags:RANSOMWARE FILE

TRELLIX_ARC_Nemty_Ransomware
MalwareTrellix Advanced Research Center· Marc Rivero | McAfee ATR Team· 2020-02-23
MALPEDIA_Win_Nemty_Auto
MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
DITEKSHEN_MALWARE_Win_Nemty
MalwareditekSHen detection· ditekSHen· 2020-11-06
CAPE_Nemty
MalwareCAPE Sandbox (CAPEv2)· kevoreilly· 2020-04-03
ARKBIRD_SOLG_RAN_Nemty_June_2021_1Métadonnées seules
MalwareArkbird SOLG (DailyIOC)· Arkbird_SOLG· 2021-06-12
DITEKSHEN_INDICATOR_KB_Gobuildid_Nemty
Suspect / chasseditekSHen detection· ditekSHen· 2021-01-21
TRELLIX_ARC_Cryptonar_Ransomware
MalwareTrellix Advanced Research Center· Marc Rivero | McAfee ATR Team· 2026-09-01
TRELLIX_ARC_Rietspoof_Loader
MalwareTrellix Advanced Research Center· Marc Rivero | McAfee ATR Team· 2026-09-01

Plus de règles Nemty