Malicious Secure Boot Bypass Files Dropped to EFI Partition

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1542.003Bootkit
Priv Esc
Defense Evasion
- T1211Exploitation for Stealth
- T1542.003Bootkit
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of the cloak.dat or reloader.efi files used by HybridPetya to exploit CVE-2024-7344 and bypass UEFI Secure Boot. Writing these bootkit components onto the EFI system partition indicates an attempt to load unsigned code during boot and achieve stealthy pre-OS persistence.

Reporting behind it

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Malicious Secure Boot Bypass Files Dropped to EFI Partition

Pivot detection · T1211 · 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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