{
  "family": "shutdown",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\n\"Shutdown\" (often detected as Riskware.Shutdown or Joke.Shutdown) is a classification for simple, usually non-destructive utility programs or scripts whose sole function is to forcefully power off, reboot, or log off the targeted Windows system. While sometimes created as harmless pranks (\"Joke\" programs), these scripts can be weaponized by threat actors to cause operational disruption, clear volatile memory to frustrate forensic analysis, or force the execution of malware that relies on a system reboot for persistence.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nShutdown utilities are typically delivered via social engineering (e.g., disguised as a game or a document sent via email) or dropped as a final step by an initial access broker or dropper Trojan.\n\nUpon execution, these programs exhibit very simple behavior:\n<ul>\n<li><strong>API Abuse:</strong> The program typically makes a direct call to the Windows API `ExitWindowsEx` or `InitiateSystemShutdown`. Alternatively, it may simply execute the built-in Windows command-line utility `shutdown.exe` with specific flags (e.g., `shutdown /s /f /t 0` for an immediate, forced power off).</li>\n<li><strong>Disruption:</strong> The execution causes the system to immediately terminate all running applications (often resulting in unsaved data loss) and initiate the power cycle.</li>\n<li><strong>Covering Tracks (Anti-Forensics):</strong> Sophisticated threat actors may deploy a Shutdown script at the conclusion of an intrusion specifically to clear the system's RAM, destroying volatile forensic artifacts (like decrypted payloads or active network connections) before incident responders can capture a memory image.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nWhile a basic Shutdown script is not inherently destructive to files like ransomware, it causes significant operational disruption. Furthermore, if the shutdown was initiated by an unauthorized actor, it may indicate a broader compromise where the shutdown is being used as a diversion or an anti-forensic measure.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Contextual Investigation:</strong> Identify how the script was executed. Was it a prank executed by a user, or was it dropped by an unknown process? The execution vector determines the severity of the incident.</li>\n<li><strong>Log Analysis:</strong> Review the Windows System Event Logs (specifically Event ID 1074, which records the reason and initiating process for a system shutdown) to determine what triggered the reboot.</li>\n<li><strong>Malware Sweep:</strong> If the shutdown was unauthorized, run a comprehensive anti-malware scan to ensure the script was not a final stage of a larger malware installation that required a reboot to establish persistence (e.g., a rootkit).</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Riskware.Shutdown",
    "Joke.Shutdown",
    "Tool.Reboot",
    "Trojan.Shutdown"
  ],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Shutdown and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Shutdown 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 Shutdown establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Shutdown 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 Shutdown compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Shutdown 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 Riskware.Shutdown employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Riskware.Shutdown 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 Riskware.Shutdown, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Riskware.Shutdown 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": [
    "T1529",
    "T1489",
    "T1059.003"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "type": "Riskware / Joke Program",
  "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,
  "mitre_attack_detail": [
    {
      "id": "T1529",
      "name": "System Shutdown/Reboot (Forcing a restart to trigger the unbootable state)",
      "tactic": "Impact"
    },
    {
      "id": "T1489",
      "name": "Service Stop (Forcefully stopping AV services)",
      "tactic": "Impact"
    },
    {
      "id": "T1059.003",
      "name": "Command and Scripting Interpreter: Windows Command Shell",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Shutdown from spreading laterally or encrypting network-attached storage (NAS) and shared SMB volumes.",
    "Preserve volatile system memory (RAM capture) on a representative endpoint before attempting a reboot or power-down, as Shutdown symmetric encryption keys or uncompiled payload components may still reside in memory.",
    "Audit process execution logs and terminate active scripting interpreters (e.g. PowerShell, CMD, WScript) or commands executing 'vssadmin.exe delete shadows' or 'wbadmin' used by Shutdown to inhibit recovery.",
    "Investigate the initial compromise vector (such as exposed RDP instances, spearphishing attachments, or vulnerable edge gateways) and enforce an immediate credential reset for all compromised Active Directory accounts.",
    "Restore critical assets and databases exclusively from verified, air-gapped, or immutable offline backups once the Shutdown binary and related persistence hooks are eradicated."
  ],
  "what_to_avoid": [
    "Do not restart or power cycle infected systems prematurely; doing so destroys volatile RAM encryption keys and may trigger bootloader locking logic embedded in Shutdown.",
    "Avoid negotiating or paying the extortion demand without prior forensic evaluation and consultation with incident response specialists, as payment does not guarantee data recovery.",
    "Do not connect clean backup drives or external storage to the affected network until Shutdown eradication is completely verified."
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}