Ryuk | Threat Level: critical | Type: Ransomware

Cryptographic Identifiers

SHA256e6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c
MD573bbbc8ae0c442025a926402c114bd1e
File Typeexe
Size137.0 KB
First Seen2021-08-31
File Namee6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c.bin
Tagsexe, Ryuk, Sidoh

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: e6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c
  • MD5: 73bbbc8ae0c442025a926402c114bd1e

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: e6762cb7d09cd90d"
        threat_level = "critical"
        first_seen = "2021-08-31"
    condition:
        hash.sha256(0, filesize) == "e6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c"
}

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 e6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c # MD5 73bbbc8ae0c442025a926402c114bd1e
TypeValueNote
sha256 e6762cb7d09cd90d5469e3c3bfc3b47979cd67aa06c06e893015a87b0348c32c
md5 73bbbc8ae0c442025a926402c114bd1e

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