Sigma low test sigma
Windows Processes Suspicious Parent Directory
Detect suspicious parent processes of well-known Windows processes
Detection Logic
{
"selection": {
"Image
| endswith": [
"\\svchost.exe",
"\\taskhost.exe",
"\\lsm.exe",
"\\lsass.exe",
"\\services.exe",
"\\lsaiso.exe",
"\\csrss.exe",
"\\wininit.exe",
"\\winlogon.exe"
]
},
"filter_sys": [
{
"ParentImage
| endswith": [
"\\SavService.exe",
"\\ngen.exe"
]
},
{
"ParentImage
| contains": [
"\\System32\\",
"\\SysWOW64\\"
]
}
],
"filter_msmpeng": {
"ParentImage
| contains": [
"\\Windows Defender\\",
"\\Microsoft Security Client\\"
],
"ParentImage
| endswith": "\\MsMpEng.exe"
},
"filter_null": [
{
"ParentImage": null
},
{
"ParentImage": [
"",
"-"
]
}
],
"condition": "selection and not 1 of filter_*"
} False Positives
- ⚠ Some security products seem to spawn these
Field Validations
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