Ryuk | Threat Level: critical | Type: Ransomware

Cryptographic Identifiers

SHA2568da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd
MD54f707c67968a14d08cc42958d5341707
File Typeexe
Size203.0 KB
First Seen2023-08-11
File Name2023-08-10_4f707c67968a14d08cc42958d5341707_ryuk
TagsRyuk

Malware Family: Ryuk

Ryuk, Wizard Spider ile ilişkilidir.

TypeRansomware
Programming LanguageC
Target PlatformWindows
C2 Protocol—
PurposeHastane hedefli ransomware
First Seen Year2018

Threat Indicators (IOC)

  • SHA256: 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd
  • MD5: 4f707c67968a14d08cc42958d5341707

System Cleanup Guide

  1. Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
  2. Do not pay the ransom — there is no guarantee your files will be restored
  3. Quarantine the affected drives
  4. Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
  5. Try available decryptor tools (the NoMoreRansom project)
  6. Yetkililere ihbarda bulunun
  7. Temiz bir yedekten kurtarın

YARA Rule Hints

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: 8da85cb00f7ba5e8"
        threat_level = "critical"
        first_seen = "2023-08-11"
    condition:
        hash.sha256(0, filesize) == "8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd"
}

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 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd # MD5 4f707c67968a14d08cc42958d5341707
TypeValueNote
sha256 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd
md5 4f707c67968a14d08cc42958d5341707
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