Sigma high stable sigma

CMSTP UAC Bypass via COM Object Access

Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects (e.g. UACMe ID of 41, 43, 58 or 65)

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Detection Logic

{
  "selection": {
    "ParentImage
| endswith": "\\DllHost.exe",
    "ParentCommandLine
| contains": [
      " /Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}",
      " /Processid:{3E000D72-A845-4CD9-BD83-80C07C3B881F}",
      " /Processid:{BD54C901-076B-434E-B6C7-17C531F4AB41}",
      " /Processid:{D2E7041B-2927-42FB-8E9F-7CE93B6DC937}",
      " /Processid:{E9495B87-D950-4AB5-87A5-FF6D70BF3E90}"
    ],
    "IntegrityLevel": [
      "High",
      "System",
      "S-1-16-16384",
      "S-1-16-12288"
    ]
  },
  "condition": "selection"
}

False Positives

  • ⚠ Legitimate CMSTP use (unlikely in modern enterprise environments)

Field Validations

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