Ryuk | Tehdit Seviyesi: critical | Tür: Ransomware

Kriptografik Tanımlayıcılar

SHA256ec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f
MD50a0b0ac20e9fe72753e74def1e37724f
Dosya Türüexe
Boyut134.5 KB
İlk Görülme2020-10-30
Dosya Adıec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f.exe
EtiketlerRyuk, TES LOGISTIKA d.o.o.

Malware Ailesi: Ryuk

Ryuk, hastane hedefler.

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

Tehdit Göstergeleri (IOC)

  • SHA256: ec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f
  • MD5: 0a0b0ac20e9fe72753e74def1e37724f

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: ec3da4ac9ec917e6"
        threat_level = "critical"
        first_seen = "2020-10-30"
    condition:
        hash.sha256(0, filesize) == "ec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f"
}

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 ec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f # MD5 0a0b0ac20e9fe72753e74def1e37724f
TypeValueNote
sha256 ec3da4ac9ec917e66ab943ab149119807922f64f2e4960ebadc36fe7520b300f Sample:Ryuk
md5 0a0b0ac20e9fe72753e74def1e37724f 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