Hayabusa high test sigma
LSASS Access Detected via Attack Surface Reduction
Detects Access to LSASS Process
Detection Logic
{
"windefend": {
"Channel": "Microsoft-Windows-Windows Defender/Operational"
},
"selection": {
"EventID": 1121,
"Path
| endswith": "\\lsass.exe"
},
"filter_thor": {
"ProcessName
| startswith": "C:\\Windows\\Temp\\asgard2-agent\\",
"ProcessName
| endswith": [
"\\thor64.exe",
"\\thor.exe"
]
},
"filter_exact": {
"ProcessName": [
"C:\\Windows\\System32\\atiesrxx.exe",
"C:\\Windows\\System32\\CompatTelRunner.exe",
"C:\\Windows\\System32\\msiexec.exe",
"C:\\Windows\\System32\\nvwmi64.exe",
"C:\\Windows\\System32\\svchost.exe",
"C:\\Windows\\System32\\Taskmgr.exe",
"C:\\Windows\\System32\\wbem\\WmiPrvSE.exe",
"C:\\Windows\\SysWOW64\\msiexec.exe"
]
},
"filter_begins": {
"ProcessName
| startswith": [
"C:\\Windows\\System32\\DriverStore\\",
"C:\\WINDOWS\\Installer\\",
"C:\\Program Files\\",
"C:\\Program Files (x86)\\"
]
},
"condition": "windefend and (selection and not 1 of filter_*)"
} False Positives
- ⚠ Google Chrome GoogleUpdate.exe
- ⚠ Some Taskmgr.exe related activity
Field Validations
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