Shutdown
Overview
Executive Summary
"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.Infection Vector and Technical Capabilities
Shutdown 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. Upon execution, these programs exhibit very simple behavior:- API Abuse: 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).
- Disruption: The execution causes the system to immediately terminate all running applications (often resulting in unsaved data loss) and initiate the power cycle.
- Covering Tracks (Anti-Forensics): 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.
Threat Assessment
While 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.Incident Response and Remediation
- Contextual Investigation: 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.
- Log Analysis: 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.
- Malware Sweep: 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).
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1529 T1489 T1059.003
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
Generated Detections (Boilerplate)
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
YARA Rule
rule MALWARE_WIN_SHUTDOWN {
meta:
description = "Detects Shutdown (ransomware)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "shutdown" ascii wide nocase
$s2 = "riskware.shutdown" ascii wide nocase
$s3 = "joke.shutdown" ascii wide nocase
$s4 = "tool.reboot" ascii wide nocase
$s5 = "trojan.shutdown" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Shutdown Activity
id: 5924f03a95ee6f7277e5bdd1e81b8fdc
status: experimental
description: Detects generic indicators of the shutdown malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*shutdown*"
- "*riskware.shutdown*"
- "*joke.shutdown*"
- "*tool.reboot*"
- "*trojan.shutdown*"
condition: selection
level: mediumReferences & External Analysis
- Search "shutdown" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Shutdown Ransomware from Windows?
Manual removal of Shutdown is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Shutdown a virus or a Ransomware?
Shutdown is classified as a Ransomware. Unlike traditional viruses that infect files, modern malware like Shutdown typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Shutdown infection?
Symptoms of Shutdown can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Related Families (Category: ransomware)
Explore other malware families in the same category:
Protect Your Network Against Ransomwares
Want to prevent Shutdown and similar threats from compromising your organization? Read our comprehensive defensive guide: Ransomware Protection Guide.
Machine-readable
Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/shutdown.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.