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Keystroke Input Capture via DirectInput
Identifies attempts to enumerate keystroke state using the Windows DirectInput API. Adversaries may log user keystrokes to intercept credentials or other information from the user as the user types them.
Detection Logic
api where process.executable : "C:\\*" and
process.thread.Ext.call_stack_final_user_module.name : "dinput*.dll" and
(process.code_signature.exists == false or
process.code_signature.status == "errorBadDigest" or
process.code_signature.subject_name in ("The MathWorks, Inc.", "AutoIt Consulting Ltd", "Python Software Foundation") or
(process.code_signature.subject_name in ("Microsoft Windows", "Microsoft Corporation") and process.executable : "?:\\Windows\\*" )) and
(process.Ext.api.name == "RegisterRawInputDevices" and
process.Ext.api.parameters.usage == "KEYBOARD" and process.thread.Ext.call_stack_summary like "*
| dinput?.dll
| *") and
not process.executable : ("?:\\Windows\\System32\\dxdiag.exe", "?:\\Windows\\SysWOW64\\dxdiag.exe") and
not (process.executable : "?:\\Windows\\System32\\rundll32.exe" and
process.command_line : "?:\\WINDOWS\\system32\\rundll32.exe ?:\\WINDOWS\\system32\\inetcpl.cpl,ClearMyTracksByProcess*") and
not (process.executable : "?:\\Windows\\Sys*\\regsvr32.exe" and process.command_line : "*\\Program Files*\\LGHUB\\sdks\\sdk_legacy_steering_wheel*") and
not process.executable : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*",
"?:\\Windows\\System32\\Macromed\\Flash\\FlashUtil_ActiveX.exe") and
not process.thread.Ext.call_stack_summary like
"wow64win.dll
| wow64.dll
| wow64cpu.dll
| wow64.dll
| ntdll.dll
| win32u.dll
| dinput8.dll
| Unknown*" Field Validations
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