Fichier Kimligi
| SHA256 | 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd |
|---|---|
| Taille | 207,872 byte (PE32+ GUI x86-64, 6 sections) |
| Entropi | 5.027 (normal — sıkıştırılmamış) |
| Imagebase | Suspicious |
RyukReadMe.html: Fidye Notu Kanıtı
RyukReadMe.html (x2 referans)\n\n-- Ryuk: Wizard Spider tehdit grubunun fidye yazılımı (2018+)\n-- Hedef: büyük kurumsal ağlar, hastaneler, belediyeler\n-- RyukReadMe.html: her şifrelenmiş klasöre bırakılan fidye notu\n-- Fidye: genellikle 15-50+ Bitcoin (kurumsal hedef)\n-- Ortalama kurban ödeme süresi: 7-10 gün
WriteProcessMemory + VirtualAllocEx + CreateRemoteThread
KERNEL32.dll -> VirtualAllocEx\nKERNEL32.dll -> WriteProcessMemory (pescan/readpe)\nKERNEL32.dll -> CreateRemoteThread\n\n-- Klasik DLL Enjeksiyon üçlüsü:\n 1. VirtualAllocEx: hedef proses belleği ayır\n 2. WriteProcessMemory: payload yaz\n 3. CreateRemoteThread: hedef proseste thread başlat\n-- Amaç: svchost.exe veya explorer.exe içinde şifreleme kodu çalıştır\n-- Tespit: işlem isimleri meşru görünür, AV daha zor tespit eder
GetIpNetTable: ARP Tablosu ile Ağ Tarama
IPHLPAPI.DLL -> GetIpNetTable\n\n-- ARP tablosu: MAC adreslerini IP adreslerine eşleyen OS tablosu\n-- GetIpNetTable: ağdaki tüm cihazları listele\n-- Ryuk kullanım amacı:\n 1. Yerel ağdaki tüm IP adreslerini bul\n 2. Her IP için ağ paylaşımlarını dene\n 3. Erişilebilenler: şifrelemeyi genişlet (wormable davranış)\n-- Bağlantı: WinDbg Ryuk analizi raporlarında bu API tespit edilmiştir
AdjustTokenPrivileges: Yetki Yükseltme
AdjustTokenPrivileges\nOpenProcessToken\nOpenThreadToken\nGetTokenInformation\n\n-- Ryuk SeBackupPrivilege, SeRestorePrivilege ve SeDebugPrivilege talep eder\n-- SeDebugPrivilege: LSASS dahil tüm proseslere erişim\n-- SeBackupPrivilege: dosya ACL bypass (korumalı dosyaları oku)\n-- VSS (Volume Shadow Service) mutex gerekmesi yetki gerektirir\n-- "The token does not have the specified privilege" hata mesajı: yetki yoksa graceful degradation
IOC
| SHA256 | 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd |
|---|---|
| Fidye Notu | RyukReadMe.html |
| Famille | Ryuk (Wizard Spider) |
| Enjeksiyon | VirtualAllocEx+WriteProcessMemory+CreateRemoteThread |
Ryuk — Profil du malware
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.
Détails techniques
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 / Acteur de la menace
WIZARD SPIDER (linked to Hermes/Lazarus initial code)
Capacités et comportement
Liste IOC (1 indicateurs)
# SHA256
8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd
| Type | Valeur | Note |
|---|---|---|
| sha256 | 8da85cb00f7ba5e8c23b058d31a4b169c18936a8f7181015ce27e871d8b8cccd |
Serveurs C2 (2 serveurs enregistrés pour cette famille)
| Adresse | Type | Port | Protocole | Statut | Pays |
|---|---|---|---|---|---|
| 51.161.204.106 | ip | 443 | HTTPS | sinkholed | CA |
| 162.119.249.198 | ip | 443 | HTTPS | sinkholed | US |
Les adresses C2 proviennent uniquement d'échantillons de malwares vérifiés manuellement par l'équipe KEYDAL. Toute utilisation commerciale est interdite.