Suspicious Replaced Filesystem Helper Execution from Library Filesystems Bundle (via process_creation)

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1547.006Kernel Modules and Extensions
Priv Esc
- T1547.006Kernel Modules and Extensions
Defense Evasion
- T1553Subvert Trust Controls
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects execution of newfs or fsck filesystem helper binaries from a third-party /Library/Filesystems bundle when not launched by the expected disk-management daemons, matching the replaced-binary technique used in the CVE-2024-44243 System Integrity Protection bypass. Adversaries swap these SIP-heritable helpers to gain code execution with protected privileges, so surfacing anomalous invocation exposes tampering before a malicious kernel extension is loaded.

Reporting behind it

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Malicious VoidLink Kernel Module Load via Insmod (via process_creation)

Suspicious Replaced Filesystem Helper Execution from Library Filesystems Bundle (via process_creation)

Pivot detection · T1547.006 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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