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Upgrade to ProDetect TCC Manipulation in Google Chronicle
This detection identifies adversary attempts to manipulate macOS Transparency, Consent, and Control (TCC) protections — either by directly modifying the TCC SQLite database to grant unauthorized permissions, by injecting into TCC-privileged applications such as Finder to inherit Full Disk Access, by abusing environment variables to load a rogue TCC database, or by exploiting SIP-disabled systems where TCC protections are bypassed entirely. Successful TCC abuse grants attackers access to protected resources including the camera, microphone, screen recording, Full Disk Access, and sensitive user directories without user prompts.
MITRE ATT&CK
- Technique
- T1548 Abuse Elevation Control Mechanism
- Sub-technique
- T1548.006 TCC Manipulation
- Canonical reference
- https://attack.mitre.org/techniques/T1548/006/
YARA-L Detection Query
rule tcc_manipulation_macos {
meta:
author = "argus-v1"
description = "Detects macOS TCC database manipulation including direct DB writes, SQLite injection, environment variable abuse, and Finder TCC inheritance attacks"
severity = "HIGH"
tactic = "TA0005"
technique = "T1548.006"
platforms = "macOS"
events:
(
// Direct TCC.db file modification by non-system process
(
$e.metadata.event_type = "FILE_MODIFICATION"
and re.regex($e.target.file.full_path, `/com\.apple\.TCC/TCC\.db`)
and not $e.principal.process.file.full_path in (
"/usr/libexec/tccd",
"/usr/libexec/syspolicyd",
"/usr/libexec/mdmclient"
)
)
or
// SQLite TCC injection via command line
(
$e.metadata.event_type = "PROCESS_LAUNCH"
and (
re.regex($e.principal.process.command_line, `sqlite3.*TCC\.db`)
or re.regex($e.principal.process.command_line, `INSERT INTO access`)
or re.regex($e.principal.process.command_line, `UPDATE access.*TCC`)
or re.regex($e.principal.process.command_line, `SQLITE_TMPDIR`)
or re.regex($e.principal.process.command_line, `HOME_TCC_DB`)
)
)
or
// Finder spawning scripting interpreters (TCC inheritance)
(
$e.metadata.event_type = "PROCESS_LAUNCH"
and re.regex($e.principal.process.file.full_path, `\.app/Contents/MacOS/Finder$`)
and $e.target.process.file.full_path in (
"/usr/bin/osascript",
"/bin/bash",
"/bin/sh",
"/bin/zsh",
"/usr/bin/python3",
"/usr/bin/ruby",
"/usr/bin/perl"
)
)
)
condition:
$e
}Chronicle YARA-L rule detecting TCC manipulation via direct TCC.db modification by unauthorized processes, SQLite command-line injection targeting the TCC database, environment variable abuse for rogue TCC database loading, and Finder spawning interpreter processes to inherit Full Disk Access.
Data Sources
Required Tables
False Positives & Tuning
- MDM enrollment workflows where mdmclient or a managed profile process modifies TCC.db for privacy policy deployment
- macOS OS upgrade assistants that rebuild the TCC database as part of migration
- Legitimate Finder-executed AppleScript workflows where users have explicitly built Automator or Shortcuts tasks
Other platforms for T1548.006
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Direct SQLite Injection into System TCC Database
Expected signal: DeviceFileEvents with ActionType=FileModified on /Library/Application Support/com.apple.TCC/TCC.db, initiating process sqlite3. macOS Unified Log entries from com.apple.TCC subsystem recording database modification.
- Test 2Rogue TCC Database via Environment Variable
Expected signal: Process launch event for osascript with SQLITE_TMPDIR environment variable set to non-standard path. File creation events in /tmp/tcc_test/com.apple.TCC/. sqlite3 process execution with TCC.db path argument.
- Test 3Finder TCC Inheritance via AppleScript
Expected signal: Process launch event showing osascript spawned as child of Finder process. Subsequent shell command execution accessing ~/Library/Messages/ which is normally TCC-protected. File creation event at /tmp/tcc_finder_test.txt.
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