Kriptografik Tanımlayıcılar
| SHA256 | 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2 |
|---|---|
| MD5 | 5ac0f050f93f86e69026faea1fbb4450 |
| Dosya Türü | exe |
| Boyut | 384.0 KB |
| İlk Görülme | 2022-02-17 |
| Dosya Adı | 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2 |
| Etiketler | exe, Ryuk |
Malware Ailesi: Ryuk
Ryuk, Wizard Spider ile ilişkilidir.
| Tür | Ransomware |
|---|---|
| Programlama Dili | C |
| Hedef Platform | Windows |
| C2 Protokolü | — |
| Amaç | Hastane hedefli ransomware |
| İlk Görülen Yıl | 2018 |
Tehdit Göstergeleri (IOC)
- SHA256:
23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2 - MD5:
5ac0f050f93f86e69026faea1fbb4450
Sistem Temizleme Rehberi
- Sistemi ağdan DERHAL ayırın — diğer cihazlara yayılmayı durdurun
- Fidye ödemeyin — dosyaları geri alma garantisi yoktur
- Etkilenen sürücüleri karantinaya alın
- Kullanılan fidye yazılımı ailesini belirleyin (nomoreransom.org)
- Mevcut decryptor tool'ları deneyin (NoMoreRansom projesi)
- Yetkililere ihbarda bulunun
- Temiz bir yedekten kurtarın
YARA Kuralı İpuçları
rule Ryuk_SHA256 {
meta:
description = "Ryuk sample: 23f8aa94ffb3c08a"
threat_level = "critical"
first_seen = "2022-02-17"
condition:
hash.sha256(0, filesize) == "23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2"
}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.
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
IOC List (2 indicators)
# SHA256
23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2
# MD5
5ac0f050f93f86e69026faea1fbb4450
| Type | Value | Note |
|---|---|---|
| sha256 | 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2 | |
| md5 | 5ac0f050f93f86e69026faea1fbb4450 |
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.