Ryuk | Bedrohungsstufe: critical | Typ: Ransomware

Kryptografische Kennungen

SHA25691450f9e8aeb0361867cdefc0bb7e5bad8941b5081db549d34a91072df4db5dc
MD5c5b0f786fe68a4312307535890ba01e4
Dateitypexe
Größe53.0 KB
Erstsichtung2023-03-29
DateinameVirusShare_c5b0f786fe68a4312307535890ba01e4
TagsRyuk

Malware-Familie: Ryuk

Ryuk, Wizard Spider ile ilişkilidir.

TypRansomware
ProgrammierspracheC
ZielplattformWindows
C2-Protokoll
ZweckHastane hedefli ransomware
Jahr der Erstsichtung2018

Bedrohungsindikatoren (IOC)

  • SHA256: 91450f9e8aeb0361867cdefc0bb7e5bad8941b5081db549d34a91072df4db5dc
  • MD5: c5b0f786fe68a4312307535890ba01e4

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. Yetkililere ihbarda bulunun
  7. Temiz bir yedekten kurtarın

Hinweise für YARA-Regeln

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: 91450f9e8aeb0361"
        threat_level = "critical"
        first_seen = "2023-03-29"
    condition:
        hash.sha256(0, filesize) == "91450f9e8aeb0361867cdefc0bb7e5bad8941b5081db549d34a91072df4db5dc"
}

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 91450f9e8aeb0361867cdefc0bb7e5bad8941b5081db549d34a91072df4db5dc # MD5 c5b0f786fe68a4312307535890ba01e4
TypWertBemerkung
sha256 91450f9e8aeb0361867cdefc0bb7e5bad8941b5081db549d34a91072df4db5dc
md5 c5b0f786fe68a4312307535890ba01e4

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
ryukransomwaremalwarecriticalsha256analizzenginleştirilmiş