Sigma high test sigma
System File Execution Location Anomaly
Detects the execution of a Windows system binary that is usually located in the system folder from an uncommon location.
Detection Logic
{
"selection": {
"Image
| endswith": [
"\\atbroker.exe",
"\\audiodg.exe",
"\\bcdedit.exe",
"\\bitsadmin.exe",
"\\certreq.exe",
"\\certutil.exe",
"\\cmstp.exe",
"\\conhost.exe",
"\\consent.exe",
"\\cscript.exe",
"\\csrss.exe",
"\\dashost.exe",
"\\defrag.exe",
"\\dfrgui.exe",
"\\dism.exe",
"\\dllhost.exe",
"\\dllhst3g.exe",
"\\dwm.exe",
"\\eventvwr.exe",
"\\fsquirt.exe",
"\\finger.exe",
"\\logonui.exe",
"\\LsaIso.exe",
"\\lsass.exe",
"\\lsm.exe",
"\\msiexec.exe",
"\\ntoskrnl.exe",
"\\powershell_ise.exe",
"\\powershell.exe",
"\\pwsh.exe",
"\\regsvr32.exe",
"\\rundll32.exe",
"\\runonce.exe",
"\\RuntimeBroker.exe",
"\\schtasks.exe",
"\\services.exe",
"\\sihost.exe",
"\\smartscreen.exe",
"\\smss.exe",
"\\spoolsv.exe",
"\\svchost.exe",
"\\taskhost.exe",
"\\taskhostw.exe",
"\\Taskmgr.exe",
"\\userinit.exe",
"\\werfault.exe",
"\\werfaultsecure.exe",
"\\wininit.exe",
"\\winlogon.exe",
"\\winver.exe",
"\\wlanext.exe",
"\\wmic.exe",
"\\wscript.exe",
"\\wsl.exe",
"\\wsmprovhost.exe"
]
},
"filter_main_generic": {
"Image
| startswith": [
"C:\\$WINDOWS.~BT\\",
"C:\\$WinREAgent\\",
"C:\\Windows\\SoftwareDistribution\\",
"C:\\Windows\\System32\\",
"C:\\Windows\\SystemTemp\\",
"C:\\Windows\\SysWOW64\\",
"C:\\Windows\\uus\\",
"C:\\Windows\\WinSxS\\"
]
},
"filter_optional_system32": {
"Image
| contains": "\\SystemRoot\\System32\\"
},
"filter_main_powershell": {
"Image
| contains": [
"C:\\Program Files\\PowerShell\\7\\",
"C:\\Program Files\\PowerShell\\7-preview\\",
"C:\\Program Files\\WindowsApps\\Microsoft.PowerShellPreview",
"\\AppData\\Local\\Microsoft\\WindowsApps\\Microsoft.PowerShellPreview"
],
"Image
| endswith": "\\pwsh.exe"
},
"filter_main_wsl_programfiles": {
"Image
| startswith": [
"C:\\Program Files\\WindowsApps\\MicrosoftCorporationII.WindowsSubsystemForLinux",
"C:\\Program Files\\WSL\\"
],
"Image
| endswith": "\\wsl.exe"
},
"filter_main_wsl_appdata": {
"Image
| startswith": "C:\\Users\\",
"Image
| contains": "\\AppData\\Local\\Microsoft\\WindowsApps\\",
"Image
| endswith": "\\wsl.exe"
},
"condition": "selection and not 1 of filter_main_* and not 1 of filter_optional_*"
} False Positives
- ⚠ Unknown
Field Validations
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