Ryuk | Niveau de menace: critical | Type: Ransomware

Identifiants cryptographiques

SHA256cfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8
MD5775705a6875573b5cb3aca1c656b76f8
Type de fichierexe
Taille123.5 KB
Première observation2020-10-27
Nom du fichiercfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8.bin
ÉtiquettesRansomware, Ryuk

Famille de malware: Ryuk

Ryuk, hastane hedefler.

TypeRansomware
Langage de programmationC
Plateforme cibleWindows
Protocole C2
ObjectifHastane ransomware
Année de première observation2018

Indicateurs de menace (IOC)

  • SHA256: cfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8
  • MD5: 775705a6875573b5cb3aca1c656b76f8

Vous pouvez vérifier toutes les valeurs de hachage de cet échantillon sur VirusTotal.

Guide de nettoyage du système

  1. Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
  2. Ne payez pas la rançon — rien ne garantit la récupération des fichiers
  3. Mettez en quarantaine les disques concernés
  4. Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
  5. Essayez les outils de déchiffrement disponibles (projet NoMoreRansom)
  6. Signalez l’incident aux autorités (unité de cybercriminalité)
  7. Temiz bir yedekten kurtarın; yedeğiniz yoksa sürücüyü saklayın

Indices de règles YARA

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: cfe1678a7f2b9499"
        threat_level = "critical"
        first_seen = "2020-10-27"
    condition:
        hash.sha256(0, filesize) == "cfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8"
}

Ryuk — Profil du malware

Wizard Spider threat group ransomware (2018+). Targets large enterprises, hospitals, municipalities. RyukReadMe.html ransom note. VirtualAllocEx+WriteProcessMemory+CreateRemoteThread injection. GetIpNetTable ARP scan for lateral movement. AdjustTokenPrivileges for SeBackupPrivilege/SeDebugPrivilege.

Type de malware
Ransomware
Langage de programmation
C
Protocole C2
Systèmes ciblés
Windows

Détails techniques

Ryuk ransomware emerged August 2018, operated by WIZARD SPIDER (TrickBot operators). Targeted large organizations for high ransoms ($100K-$12.5M+ per victim). Distribution: delivered via TrickBot/BazarLoader infections (human-operated). Encryption: RSA-2048 + AES-256 (CBC mode), unique key per file. Stops 40+ Windows services (backup, antivirus, database) and kills >180 processes. Deletes volume shadow copies (vssadmin delete shadows /all /Quiet). Disables Windows recovery: bcdedit /set {default} recoveryenabled No. Network propagation: uses Wake-on-LAN to activate sleeping network hosts for encryption. Believed based on Hermes ransomware sold by a North Korean-linked actor on underground forums. Predecessor to Conti ransomware which emerged from WIZARD SPIDER's operations in 2020.

Attribution / Acteur de la menace

WIZARD SPIDER (linked to Hermes/Lazarus initial code)

Capacités et comportement

Dosya Şifreleme (AES/RSA)
Gölge Kopya Silme
Yedek Kaldırma
Fidye Notu Oluşturma
Kalıcılık Sağlama
Ağ Paylaşımı Şifreleme
Anti-Analiz Teknikleri
Çift Gasp (Data Leak)

Liste IOC (2 indicateurs)

IOC — Ryuk
# SHA256 cfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8 # MD5 775705a6875573b5cb3aca1c656b76f8
TypeValeurNote
sha256 cfe1678a7f2b949966d9a020faafb46662584f8a6ac4b72583a21fa858f2a2e8 Sample:Ryuk
md5 775705a6875573b5cb3aca1c656b76f8 Sample:Ryuk

Serveurs C2 (2 serveurs enregistrés pour cette famille)

Adresse Type Port Protocole Statut Pays
51.161.204.106 ip 443 HTTPS sinkholed CA
162.119.249.198 ip 443 HTTPS sinkholed US

Les adresses C2 proviennent uniquement d'échantillons de malwares vérifiés manuellement par l'équipe KEYDAL. Toute utilisation commerciale est interdite.

Tags
ryukransomwaremalwarecriticalsha256hash-analizi