Identificadores criptográficos
| SHA256 | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a |
|---|---|
| MD5 | 8555b213260ba5eda4bf37652cecb431 |
| Tipo de archivo | exe |
| Tamaño | 139.5 KB |
| Primera detección | 2021-01-11 |
| Nombre de archivo | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin |
| Etiquetas | Ransomware, Ryuk |
Familia de malware: Ryuk
Ryuk, Wizard Spider ile ilişkilidir.
| Tipo | Ransomware |
|---|---|
| Lenguaje de programación | C |
| Plataforma objetivo | Windows |
| Protocolo C2 | — |
| Propósito | Hastane hedefli ransomware |
| Año de primera detección | 2018 |
Indicadores de amenaza (IOC)
- SHA256:
781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a - MD5:
8555b213260ba5eda4bf37652cecb431
Guía de limpieza del sistema
- Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
- No pague el rescate: no hay garantía de recuperar los archivos
- Ponga en cuarentena las unidades afectadas
- Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
- Pruebe las herramientas de descifrado disponibles (proyecto NoMoreRansom)
- Yetkililere ihbarda bulunun
- Temiz bir yedekten kurtarın
Sugerencias de reglas YARA
rule Ryuk_SHA256 {
meta:
description = "Ryuk sample: 781bc4dcbd459893"
threat_level = "critical"
first_seen = "2021-01-11"
condition:
hash.sha256(0, filesize) == "781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a"
}Ryuk — Perfil del 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.
Detalles técnicos
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.
Atribución / Actor de amenaza
WIZARD SPIDER (linked to Hermes/Lazarus initial code)
Capacidades y comportamiento
Lista IOC (2 indicadores)
# SHA256
781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a
# MD5
8555b213260ba5eda4bf37652cecb431
| Tipo | Valor | Nota |
|---|---|---|
| sha256 | 781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a | |
| md5 | 8555b213260ba5eda4bf37652cecb431 |
Servidores C2 (2 servidores registrados para esta familia)
| Dirección | Tipo | Puerto | Protocolo | Estado | País |
|---|---|---|---|---|---|
| 51.161.204.106 | ip | 443 | HTTPS | sinkholed | CA |
| 162.119.249.198 | ip | 443 | HTTPS | sinkholed | US |
Las direcciones C2 se proporcionan únicamente a partir de muestras de malware verificadas manualmente por el equipo KEYDAL. Se prohíbe el uso comercial.