Ryuk | Threat Level: critical | Type: Ransomware

Cryptographic Identifiers

SHA256302fa0883fe21e4d0b56c68574a8073edb05b20325c41ea41e6d4e4005d0f9e1
MD53d3fce34e2092be6629eb75cee97ec69
File Typeexe
Size1055.5 KB
First Seen2024-04-15
File Name3d3fce34e2092be6629eb75cee97ec69.exe
Tagsexe, HUN, Ryuk

Malware Family: Ryuk

Ryuk, hastane hedefler.

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

Threat Indicators (IOC)

  • SHA256: 302fa0883fe21e4d0b56c68574a8073edb05b20325c41ea41e6d4e4005d0f9e1
  • MD5: 3d3fce34e2092be6629eb75cee97ec69

You can verify all hash values of this sample on VirusTotal.

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. Report the incident to the authorities (cybercrime unit)
  7. Temiz bir yedekten kurtarın; yedeğiniz yoksa sürücüyü saklayın

YARA Rule Hints

rule Ryuk_SHA256 {
    meta:
        description = "Ryuk sample: 302fa0883fe21e4d"
        threat_level = "critical"
        first_seen = "2024-04-15"
    condition:
        hash.sha256(0, filesize) == "302fa0883fe21e4d0b56c68574a8073edb05b20325c41ea41e6d4e4005d0f9e1"
}

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 302fa0883fe21e4d0b56c68574a8073edb05b20325c41ea41e6d4e4005d0f9e1 # MD5 3d3fce34e2092be6629eb75cee97ec69
TypeValueNote
sha256 302fa0883fe21e4d0b56c68574a8073edb05b20325c41ea41e6d4e4005d0f9e1 Sample:Ryuk
md5 3d3fce34e2092be6629eb75cee97ec69 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