Identifiants cryptographiques
| SHA256 | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a |
|---|---|
| MD5 | 8555b213260ba5eda4bf37652cecb431 |
| Type de fichier | exe |
| Taille | 139.5 KB |
| Première observation | 2021-01-11 |
| Nom du fichier | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin |
| Étiquettes | Ransomware, Ryuk |
Famille de malware: Ryuk
Ryuk, Wizard Spider ile ilişkilidir.
| Type | Ransomware |
|---|---|
| Langage de programmation | C |
| Plateforme cible | Windows |
| Protocole C2 | — |
| Objectif | Hastane hedefli ransomware |
| Année de première observation | 2018 |
Indicateurs de menace (IOC)
- SHA256:
781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a - MD5:
8555b213260ba5eda4bf37652cecb431
Guide de nettoyage du système
- Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
- Ne payez pas la rançon — rien ne garantit la récupération des fichiers
- Mettez en quarantaine les disques concernés
- Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
- Essayez les outils de déchiffrement disponibles (projet NoMoreRansom)
- Yetkililere ihbarda bulunun
- Temiz bir yedekten kurtarın
Indices de règles YARA
rule Ryuk_SHA256 {
meta:
description = "Ryuk sample: 781bc4dcbd459893"
threat_level = "critical"
first_seen = "2021-01-11"
condition:
hash.sha256(0, filesize) == "781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a"
}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.
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
Liste IOC (2 indicateurs)
# SHA256
781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a
# MD5
8555b213260ba5eda4bf37652cecb431
| Type | Valeur | Note |
|---|---|---|
| sha256 | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a | |
| md5 | 8555b213260ba5eda4bf37652cecb431 |
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.