{
  "family": "keyboarddisable",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\n\"KeyboardDisable\" is not a fully-featured malware family, but rather a specific, malicious payload component or behavioral symptom often associated with ransomware, screenlockers, or disruptive trojans. As the name suggests, its primary function is to intercept or completely disable keyboard input, severely hindering the victim's ability to respond to a cyberattack.\n\n<h3>Technical Implementation and Context</h3>\nThe ability to disable keyboard (and often mouse) input is a tactic utilized during the critical execution phases of other malware. It is implemented using native operating system APIs.\n\nIn a Windows environment, this is typically achieved by:\n<ul>\n<li><strong>API Hooking:</strong> Utilizing `SetWindowsHookEx` with the `WH_KEYBOARD_LL` (Low-Level Keyboard Hook) parameter to intercept all keystrokes. The malicious hook function simply discards the input, preventing it from reaching any application or the OS.</li>\n<li><strong>Driver Manipulation:</strong> In more sophisticated attacks (often requiring kernel-level privileges), the malware may attempt to uncouple or corrupt the legitimate keyboard filter drivers (`kbdclass.sys`).</li>\n</ul>\nThis tactic is most frequently observed in \"Screenlocker\" ransomware (which locks the screen and demands payment without necessarily encrypting files) to prevent the user from accessing the Task Manager (Ctrl+Alt+Del) or booting into Safe Mode.\n\n<h3>Threat Assessment</h3>\nWhile disabling the keyboard does not destroy data, it is a severe Denial of Service (DoS) condition on the local endpoint. It induces panic and forces the user to perform a hard reset, which may exacerbate data loss if ransomware is actively encrypting files in the background.\n\n<h3>Incident Response and Recovery</h3>\n<ul>\n<li><strong>Hard Reboot and Safe Mode:</strong> If the keyboard is disabled by user-mode hooking, a hard reboot followed immediately by booting into Windows Safe Mode (which loads minimal drivers and startup programs) will often bypass the malicious hook.</li>\n<li><strong>Remote Administration:</strong> System administrators can utilize remote management tools (RDP, PowerShell Remoting, or enterprise EDR consoles) to identify and kill the offending process, as the remote keyboard input may bypass local hooks.</li>\n<li><strong>Root Cause Analysis:</strong> Treat the disabled keyboard as a symptom of a larger infection. Once control is regained, a full forensic scan must be performed to locate the primary payload (e.g., the ransomware or trojan) that deployed the KeyboardDisable component.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.KeyboardDisable",
    "ScreenLocker Component",
    "Behavior.KeyboardLock"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1489",
    "T1056.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:09:08Z",
  "type": "Trojan",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}