Elastic Defend high stable eql
Keystroke Messages Hooking via SetWindowsHookEx
Identifies attempts to install an application-defined hook procedure to monitor keystroke messages. Adversaries may log user keystrokes to intercept credentials or other information from the user as the user types them.
Detection Logic
api where process.Ext.api.name == "SetWindowsHookEx" and process.Ext.api.parameters.hook_type == "WH_KEYBOARD_LL" and
process.Ext.api.parameters.hook_module == "null" and
process.thread.Ext.call_stack_final_user_module.hash.sha256 != null and not process.code_signature.status : "trusted" and
process.thread.Ext.call_stack_summary : "?*" and process.executable != null and
not process.thread.Ext.call_stack_summary :
("*user32.dll
| explorer.exe
| user32.dll*",
"*user32.dll
| tabskb.dll
| kernel32.dll*",
"*user32.dll
| taskbar.dll*",
"win32u.dll
| user32.dll
| pilotshubapp.dll",
"*win32u.dll
| user32.dll
| mtb.exe
| mfc90u.dll
| mtb.exe*",
"win32u.dll
| user32.dll
| powertoy*",
"win32u.dll
| user32.dll
| rdclientax.dl*",
"*qt6gui.dll
| qt6core.dll*",
"win32u.dll
| user32.dll
| rwsfoundation_x64.dll
| ucrtbase.dll
| kernel32.dll
| ntdll.dll",
"win32u.dll
| user32.dll
| autohotkey*.exe
| kernel32.dll
| ntdll.dll") and
not process.thread.Ext.call_stack_final_user_module.hash.sha256 in
("1683394a15b58815a01bbe030dfc1e441a9b0f7f38d18bd5c13d41d573d58f53",
"bec3b34c8e9c04a1da28c623fb06cee45739113a38a1eae52d2a3b208c4baa6f",
"0d083e72eb0e8cbcec2c347840bff815513eecf29648065163b08c600f6c95ff",
"38011e713b4be8577576062754cad03e9899859488932ae4c9c83e5fbb5cb7d2",
"b67e006287fba2278f897d242ff58548b7d6b15ac490a91c26318c6f396da195",
"feaf9479260db6f41d1e6443d0d80826eeee4905ef97a1cab78c16bc304248a5",
"465d3985e1dd8bc69137e2a8c5a4a6ba16b0ff99c647245ca66942750ccc75ef",
"549888a9e268dd5ca6544cabc8266148ff0d8728c3aa0f1c68f9f8bcb116e53d") and
not process.thread.Ext.call_stack_final_user_module.path :
("?:\\Program Files\\*",
"?:\\Program Files (x86)\\*",
"?:\\windows\\system32\\*",
"?:\\windows\\syswow64\\*",
"\\Program Files\\*",
"\\Program Files (x86)\\*",
"\\windows\\system32\\*",
"\\windows\\syswow64\\*",
"?:\\windows\\explorer.exe",
"\\windows\\explorer.exe",
"*\\windows\\systemapps\\*",
"c:\\windows\\microsoft.net\\framework*\\clr.dll",
"*\\windows\\assembly\\*",
"?:\\windows\\systemapps\\*.dll",
"?:\\Windows\\WinSxS\\*.dll",
"?:\\windows\\assembly\\*.dll",
"\\windows\\systemapps\\*.dll",
"\\Windows\\WinSxS\\*.dll",
"\\windows\\assembly\\*.dll",
"\\windows\\shellexperiences\\*.dll",
"?:\\progra~?\\citrix\\icacli~?\\vdkbhook.dll",
"?:\\windows\\shellexperiences\\*.dll",
"\\windows\\shellexperiences\\*.dll",
"?:\\windows\\jmesoft\\keyhook.dll",
"?:\\users\\*\\appdata\\local\\microsoft\\teams\\current\\d3dcompiler_??.dll",
"\\device\\mup\\*",
"?:\\windows\\immersivecontrolpanel\\systemsettings.dll") and
not process.thread.Ext.call_stack_final_user_module.name : ("Unknown", "Undetermined") and
not process.thread.Ext.call_stack_final_user_module.protection_provenance : ("hmpalert.dll", "kernel") and
not process.executable :
("?:\\Program Files\\workspacer\\workspacer.exe",
"?:\\Program Files (x86)\\Do It Again\\DoItAgain.exe",
"?:\\Program Files (x86)\\HP\\HP LaserJet Pro MFP *\\bin\\HPScan.exe",
"?:\\Program Files (x86)\\Avaya\\Avaya IX Workplace\\fTarget\\Avaya.BrowserExtension.exe") and
not _arraysearch(process.thread.Ext.call_stack_final_user_module.code_signature, $entry, $entry.status : "trusted") Field Validations
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