Hayabusa high experimental sigma

Suspicious Process Access to LSASS with Dbgcore/Dbghelp DLLs

Detects suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.dll in the call trace. These DLLs contain functions like MiniDumpWriteDump that can be abused for credential dumping purposes. While modern tools like Mimikatz have moved to using ntdll.dll, dbgcore.dll and dbghelp.dll are still used by basic credential dumping utilities and legacy tools for LSASS memory access and process suspension techniques.

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Detection Logic

{
  "process_access": {
    "EventID": 10,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection_lsass_calltrace": {
    "TargetImage
| endswith": "\\lsass.exe",
    "CallTrace
| contains": [
      "dbgcore.dll",
      "dbghelp.dll"
    ]
  },
  "selection_susp_location": {
    "SourceImage
| contains": [
      ":\\Perflogs\\",
      ":\\Temp\\",
      ":\\Users\\Public\\",
      "\\$Recycle.Bin\\",
      "\\AppData\\Roaming\\",
      "\\Contacts\\",
      "\\Desktop\\",
      "\\Documents\\",
      "\\Downloads\\",
      "\\Favorites\\",
      "\\Favourites\\",
      "\\inetpub\\wwwroot\\",
      "\\Music\\",
      "\\Pictures\\",
      "\\Start Menu\\Programs\\Startup\\",
      "\\Users\\Default\\",
      "\\Videos\\",
      "\\Windows\\Temp\\"
    ]
  },
  "condition": "process_access and (all of selection_*)"
}

False Positives

  • ⚠ Possibly during software installation or update processes

Field Validations

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