{
  "family": "saturn",
  "sample_count": 2,
  "category": "ransomware",
  "description": "Ransomware:Win32/Saturn is a destructive crypto-ransomware family designed to extort organizations by encrypting critical data and demanding payment in cryptocurrency for the decryption key. It operates on a Ransomware-as-a-Service (RaaS) model, where the core developers lease the malware to various affiliates who handle the distribution and initial infection, splitting the profits. Saturn was notable for offering affiliates a portal to generate custom decryptors and manage their campaigns.<br><br><b>Understanding Saturn (Ransomware)</b><br>To an end-user, a Saturn infection is catastrophic. Files become inaccessible, their extensions are changed (e.g., appended with `.saturn`), and a text or HTML file drops onto the desktop demanding a ransom. For an enterprise, it represents a massive incident requiring immediate disaster recovery protocols. The attackers leverage strong encryption (typically AES combined with RSA) (`T1486`) to ensure data recovery is mathematically impossible without the attacker's private key.<br><br><b>Execution and Extortion Mechanics</b><br>Saturn is distributed via various methods depending on the affiliate, commonly including malspam (`T1566.001`), exploit kits, or RDP brute-forcing (`T1133`). Upon execution, the malware rapidly disables local recovery options (`T1490`) by executing `vssadmin.exe Delete Shadows /All /Quiet` and disabling Windows Startup Repair. It then traverses local drives and mapped network shares, encrypting files matching specific extensions (documents, databases, images). Finally, it drops the ransom note (`T1491.001`) and changes the desktop wallpaper to ensure the victim is aware of the extortion demand.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is severe business disruption, potential data loss, and financial extortion. Host-based IoCs include EDR alerts for rapid, mass file modifications (`T1486`), the execution of `vssadmin.exe` or `bcdedit.exe` to destroy backups, and the presence of the `.saturn` file extensions. The creation of `#!_Saturn_Decrypt_!#.txt` or similar ransom notes in multiple directories is a definitive indicator. Network IoCs may include the initial dropper communicating with known RaaS infrastructure, though the encryption process itself does not require network connectivity.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Saturn and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Saturn is classified as a Ransomware. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Saturn establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Saturn typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Saturn compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Saturn should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What cryptographic algorithms and file targeting techniques does Saturn employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Saturn typically leverages hybrid cryptographic architectures combining symmetric stream or block ciphers (such as AES-256 or ChaCha20) for rapid file encryption with asymmetric algorithms (such as RSA-2048 or Curve25519) to securely protect the session keys. It aggressively targets sensitive file extensions including corporate documents, databases, virtual disks, and backups while systematically executing commands to delete Volume Shadow Copies (vssadmin delete shadows /all /quiet) and disable system recovery options."
      }
    },
    {
      "@type": "Question",
      "name": "Are decryptors available for Saturn, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Saturn depends on whether security researchers or law enforcement (such as the No More Ransom initiative) have recovered the master private keys or discovered flaws in its key generation routines. Victims should never pay the extortion demand, as payment fuels criminal operations without guaranteeing file restoration. The recommended recovery procedure entails isolating infected hosts, conducting forensic disk imaging, identifying the root access vector, and restoring validated systems from immutable offline backups."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1490",
    "T1486",
    "T1491.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1486",
      "name": "Data Encrypted for Impact (The core ransomware action)",
      "tactic": "Impact"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery (Deleting Volume Shadow Copies)",
      "tactic": "Impact"
    },
    {
      "id": "T1491.001",
      "name": "Defacement: Internal Defacement (Changing wallpaper / dropping notes)",
      "tactic": "Impact"
    }
  ],
  "containment_steps": [
    "IMMEDIATELY isolate the infected machine from the network (unplug the Ethernet cable) to halt the encryption of mapped network shares and lateral movement.",
    "Do not reboot or power off the machine immediately if a live memory capture is possible, as the encryption keys might temporarily reside in RAM.",
    "Identify the initial infection vector (e.g., compromised RDP credentials or a phishing email) and close it enterprise-wide.",
    "Initiate disaster recovery procedures; wipe the infected machines entirely and restore data from offline, immutable backups."
  ],
  "what_to_avoid": [
    "Never pay the ransom; it funds criminal organizations and there is zero guarantee they will provide a working decryption key.",
    "Do not connect backup drives or network shares to an infected machine to 'check' the data, as the ransomware will immediately encrypt the backups."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Financial Extortion",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}