Mousedisable

Overview

Trojan:Win32/Mousedisable is a heuristic detection for a specific, highly disruptive behavioral trait found in various 'Joke' programs, Lockers, and poorly written Ransomware. As the name implies, its primary function upon execution is to actively hook into the Windows API to intercept and block all input from the victim's mouse and keyboard (`T1562.001`). This essentially paralyzes the user, preventing them from interacting with the operating system to stop the malware or launch diagnostic tools.

Understanding Mousedisable (Input Blockers)
To an end-user, the computer suddenly freezes; the cursor won't move, and `Ctrl+Alt+Delete` does nothing. For a security analyst, a Mousedisable event indicates a blatant and aggressive attempt by malware to impair defenses and prevent manual remediation (`T1562.001`). This tactic is often a delaying mechanism, used to stall the user while a more destructive payload (like data encryption or exfiltration) executes silently in the background.

Execution and Disruption Mechanics
Mousedisable behavior is typically implemented using the Windows `SetWindowsHookEx` API. The malware installs a low-level keyboard hook (`WH_KEYBOARD_LL`) and mouse hook (`WH_MOUSE_LL`). When these hooks are in place, the malware intercepts all input events before they reach the intended applications or the OS shell. The malware's hook procedure simply discards the input events, causing the system to ignore the user. To prevent the user from simply rebooting to clear the hook, the malware often establishes persistence (`T1547.001`) to ensure it runs immediately upon the next logon.

Indicators of Compromise & Impact
The impact is a total, immediate Denial of Service (DoS) for the local user (`T1489`). Host-based IoCs include EDR alerts for 'Suspicious API Hooking' specifically targeting input mechanisms. The primary indicator is the physical manifestation: an unresponsive system that may still be displaying active processes on the screen. Network IoCs are dependent entirely on the secondary payloads the malware might be deploying while the user is locked out.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1056.001: Implement Endpoint Detection and Response (EDR) to monitor for suspicious API calls related to keystroke interception. Enforce Multi-Factor Authentication (MFA) to render stolen passwords useless.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_MOUSEDISABLE_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Mousedisable"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "mousedisable" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Mousedisable (Ransomware) Execution & Triage
id: 831d5aba-f5a6-5d26-a1ed-a3b3e5de37c0
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Mousedisable malware family. Detects volume shadow copy deletion, boot
  status tampering, and recovery inhibition characteristic of modern ransomware operations.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/mousedisable
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.ransomware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1489
- attack.t1562_001
- attack.t1056_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \vssadmin.exe
    - \wmic.exe
    - \wbadmin.exe
    - \bcdedit.exe
    CommandLine|contains:
    - delete shadows
    - shadowcopy delete
    - resize shadowstorage
    - recoveryenabled no
    - ignoreallfailures
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: critical

rule MALWARE_WIN_MOUSEDISABLE_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Mousedisable tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "mousedisable" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Perform a hard reboot of the machine (hold the power button); if the malware lacks persistence, this will temporarily restore control.
2. If the malware is persistent, reboot the machine into 'Safe Mode' or use a bootable USB recovery environment to bypass the autorun keys.
3. Once in a clean environment, use an AV scanner or manually inspect the Registry Run keys to delete the malicious executable.
4. Investigate EDR telemetry for the time period during which the mouse was disabled to determine if secondary payloads were executed.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not assume the computer has simply 'frozen' due to a hardware issue; if this happens repeatedly after booting, it is likely malware.
2. Avoid leaving the machine running in a locked state; if it's ransomware stalling you, every minute counts. Hard reboot immediately.

References & External Analysis

• Search "mousedisable" on VirusTotal (External Analysis)
• Search "mousedisable" on Any.Run (Sandbox Sandbox)
• Search "mousedisable" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Ransomware)

Explore other documented threats in the same operational category:

• Lowzones
• Ruskill
• Pccleanplus
• Genx
• Erbon
• Cqst
• Searchprovide
• Mailpassview

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/mousedisable.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.