Bypass Record
Direct Syscalls × Bitdefender Endpoint Security
A publicly-reported instance of Direct Syscalls bypassing Bitdefender Endpoint Security, recorded with its original source. Factual record; no assessment of any specific deployment.
Mechanism
Combines direct syscalls with dynamic SSN resolution to avoid user-mode EDR hooks. Uses an egg-hunt technique to replace syscall instructions with random bytes in the stub, patching them back at runtime to evade static detection. Also employs Windows API forking (process ghosting/forking) and random prototypes/procedures to hinder static analysis.
Detection & mitigation
Monitor for processes making direct syscall instructions (e.g., syscall/sysenter) from non-standard or unhooked ntdll.dll regions, or using dynamic syscall number resolution. Deploy kernel-mode callbacks (e.g., PsSetCreateProcessNotifyRoutine) and ETW providers to detect process ghosting/forking anomalies, and enforce application control policies to block unsigned or untrusted executables.
This is a record of a publicly-reported event, not an assessment of any specific organization's deployment. Detection and mitigation notes are drawn from the cited source. Where the source is silent, fields are omitted.