Hayabusa high stable sigma

CMSTP App Paths Registry Key Modification

Detects modifications to the CMSTP App Paths registry key. This may indicate abuse of Microsoft Connection Manager Profile Installer (CMSTP) for arbitrary code execution or UAC bypass.

View Source

Detection Logic

{
  "registry_event": {
    "EventID": 4657,
    "Channel": "Security"
  },
  "selection": {
    "ObjectName
| contains": "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\cmmgr32.exe\\"
  },
  "filter_main_cmcfg32": {
    "ObjectName
| endswith": "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\cmmgr32.exe\\CmstpExtensionDll",
    "NewValue": [
      "C:\\Windows\\System32\\cmcfg32.dll",
      "C:\\Windows\\SysWOW64\\cmcfg32.dll"
    ]
  },
  "filter_main_empty": {
    "NewValue": "(Empty)"
  },
  "condition": "registry_event and (selection and not 1 of filter_main_*)"
}

False Positives

⚠ Legitimate CMSTP use (unlikely in modern enterprise environments)

Field Validations

Loading…

Comments (0)

Loading comments...