Ryuk | Tehdit Seviyesi: critical | Tür: Ransomware

Kriptografik Tanımlayıcılar

SHA25679a98588b501d1fdb5de009a49dccaaf2f7683407c856f5007c062f36823aad0
MD58e62455d24fa491c46f5c7201084ca76
Dosya Türüexe
Boyut2501.7 KB
İlk Görülme2023-03-10
Dosya Adı2023-03-09_8e62455d24fa491c46f5c7201084ca76_ryuk
EtiketlerRyuk

Malware Ailesi: Ryuk

Ryuk, Wizard Spider ile ilişkilidir.

TürRansomware
Programlama DiliC
Hedef PlatformWindows
C2 Protokolü—
AmaçHastane hedefli ransomware
İlk Görülen Yıl2018

Tehdit Göstergeleri (IOC)

  • SHA256: 79a98588b501d1fdb5de009a49dccaaf2f7683407c856f5007c062f36823aad0
  • MD5: 8e62455d24fa491c46f5c7201084ca76

Sistem Temizleme Rehberi

  1. Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
  2. Fidye ödemeyin — dosyaları geri alma garantisi yoktur
  3. Etkilenen sürücüleri karantinaya alın
  4. Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
  5. Mevcut decryptor tool'ları deneyin (NoMoreRansom projesi)
  6. Yetkililere ihbarda bulunun
  7. Temiz bir yedekten kurtarın

YARA Kuralı İpuçları

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: 79a98588b501d1fd"
        threat_level = "critical"
        first_seen = "2023-03-10"
    condition:
        hash.sha256(0, filesize) == "79a98588b501d1fdb5de009a49dccaaf2f7683407c856f5007c062f36823aad0"
}

Ryuk — Malware Profile

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 Type
Ransomware
Programming Language
C
C2 Protocol
—
Target Systems
Windows

Technical 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 / Threat Actor

WIZARD SPIDER (linked to Hermes/Lazarus initial code)

Capabilities & Behavior

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 List (2 indicators)

IOC — Ryuk
# SHA256 79a98588b501d1fdb5de009a49dccaaf2f7683407c856f5007c062f36823aad0 # MD5 8e62455d24fa491c46f5c7201084ca76
TypeValueNote
sha256 79a98588b501d1fdb5de009a49dccaaf2f7683407c856f5007c062f36823aad0
md5 8e62455d24fa491c46f5c7201084ca76
Ryuk — Go to Full Profile →

C2 Servers (2 recorded servers for this family)

Address Type Port Protocol Status Country
51.161.204.106 ip 443 HTTPS sinkholed CA
162.119.249.198 ip 443 HTTPS sinkholed US

C2 addresses are provided only from malware samples manually verified by the KEYDAL team. Commercial use is prohibited.

Tags
ryukransomwaremalwarecriticalsha256analizzenginleştirilmiş