Ryuk | Bedrohungsstufe: critical | Typ: Ransomware

Kryptografische Kennungen

SHA256327da452b8c86ed8910056646771de8fb92a928c3d135efb2d41e6cb26806382
MD542513d9fbd45e442f8f499a7bb5746a2
Dateitypexe
Größe7877.8 KB
Erstsichtung2020-10-22
DateinameReport-Review22-10.exe
TagsBazaLoader, Ransomware, Ryuk, ZLoader

Malware-Familie: Ryuk

Ryuk, hastane hedefler.

TypRansomware
ProgrammierspracheC
ZielplattformWindows
C2-Protokoll
ZweckHastane ransomware
Jahr der Erstsichtung2018

Bedrohungsindikatoren (IOC)

  • SHA256: 327da452b8c86ed8910056646771de8fb92a928c3d135efb2d41e6cb26806382
  • MD5: 42513d9fbd45e442f8f499a7bb5746a2

Sie können alle Hash-Werte dieses Samples auf VirusTotal überprüfen.

Anleitung zur Systembereinigung

  1. Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
  2. Zahlen Sie kein Lösegeld — es gibt keine Garantie für die Wiederherstellung
  3. Stellen Sie die betroffenen Laufwerke unter Quarantäne
  4. Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
  5. Probieren Sie verfügbare Entschlüsselungstools (Projekt NoMoreRansom)
  6. Melden Sie den Vorfall den Behörden (Cybercrime-Einheit)
  7. Temiz bir yedekten kurtarın; yedeğiniz yoksa sürücüyü saklayın

Hinweise für YARA-Regeln

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: 327da452b8c86ed8"
        threat_level = "critical"
        first_seen = "2020-10-22"
    condition:
        hash.sha256(0, filesize) == "327da452b8c86ed8910056646771de8fb92a928c3d135efb2d41e6cb26806382"
}

Ryuk — Malware-Profil

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.

Malware-Typ
Ransomware
Programmiersprache
C
C2-Protokoll
Zielsysteme
Windows

Technische Details

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 / Bedrohungsakteur

WIZARD SPIDER (linked to Hermes/Lazarus initial code)

Fähigkeiten & Verhalten

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

IOC-Liste (2 Indikatoren)

IOC — Ryuk
# SHA256 327da452b8c86ed8910056646771de8fb92a928c3d135efb2d41e6cb26806382 # MD5 42513d9fbd45e442f8f499a7bb5746a2
TypWertBemerkung
sha256 327da452b8c86ed8910056646771de8fb92a928c3d135efb2d41e6cb26806382 Sample:Ryuk
md5 42513d9fbd45e442f8f499a7bb5746a2 Sample:Ryuk

C2-Server (2 erfasste Server für diese Familie)

Adresse Typ Port Protokoll Status Land
51.161.204.106 ip 443 HTTPS sinkholed CA
162.119.249.198 ip 443 HTTPS sinkholed US

C2-Adressen stammen ausschließlich aus vom KEYDAL-Team manuell verifizierten Malware-Samples. Kommerzielle Nutzung ist untersagt.

Tags
ryukransomwaremalwarecriticalsha256hash-analizi