Ryuk | Tehdit Seviyesi: critical | Tür: Ransomware

Kriptografik Tanımlayıcılar

SHA256d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8
MD5097cb948a1f011f5de11579849a08db5
Dosya Türüexe
Boyut120.5 KB
İlk Görülme2020-10-27
Dosya Adıd7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8.bin
EtiketlerRansomware, Ryuk

Malware Ailesi: Ryuk

Ryuk, hastane hedefler.

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

Tehdit Göstergeleri (IOC)

  • SHA256: d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8
  • MD5: 097cb948a1f011f5de11579849a08db5

Bu örneğin tüm hash değerlerini VirusTotal üzerinde doğrulayabilirsiniz.

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 (Siber Suç Birimi) ihbarda bulunun
  7. Temiz bir yedekten kurtarın; yedeğiniz yoksa sürücüyü saklayın

YARA Kuralı İpuçları

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: d7333223dcc1002a"
        threat_level = "critical"
        first_seen = "2020-10-27"
    condition:
        hash.sha256(0, filesize) == "d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8"
}

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 d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8 # MD5 097cb948a1f011f5de11579849a08db5
TypeValueNote
sha256 d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8 Sample:Ryuk
md5 097cb948a1f011f5de11579849a08db5 Sample:Ryuk

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
ryukransomwaremalwarecriticalsha256hash-analizi