Detection rules › Sigma
macOS UL Unusual TCC Access Request
Detects unusual TCC (Transparency, Consent, and Control) access requests that may indicate malicious behavior
Known false positives
- Legitimate installer applications
- System configuration tools
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Collection | No specific technique |
Telemetry coverage
Rule body
title: macOS UL Unusual TCC Access Request
id: c3d4e5f6-a7b8-9012-cdef-345678901234
status: experimental
description: Detects unusual TCC (Transparency, Consent, and Control) access requests that may indicate malicious behavior
author: Eric Brown - Nebulock, Inc.
date: 2025/01/15
modified: 2025/01/15
logsource:
product: macos
service: unifiedlog
category: tcc
detection:
selection:
subsystem: com.apple.TCC
message|contains:
- 'Full Disk Access'
- 'Camera'
- 'Microphone'
- 'Screen Recording'
ProcessName|contains:
- '.dmg'
- '.pkg'
- '/tmp'
- '/var/tmp'
condition: selection
falsepositives:
- Legitimate installer applications
- System configuration tools
level: medium
tags:
- attack.collection
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
subsystem: com.apple.TCC
message|contains:
- 'Full Disk Access'
- 'Camera'
- 'Microphone'
- 'Screen Recording'
ProcessName|contains:
- '.dmg'
- '.pkg'
- '/tmp'
- '/var/tmp'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ProcessName | match |
| field:"process_name" kind:match |
message | match |
| field:"message" kind:match |
subsystem | eq |
| field:"subsystem" kind:eq value:"com.apple.TCC" |