This is a repository that filled with ideas to break/detect direct syscall techniques. Contribution is really appreciated.

• Dual-Loading NTDLL from disk
  • Can be traced/detected from hooking NtMapViewOfSection.
  • Use IntrumentationCallback to detects syscalls and check if the return address is outside NTDLL.
• Manual-Mapping NTDLL from disk
  • Can be traced/detected from hooking NtReadFile or use NiceTryDLL
  • Use IntrumentationCallback to detects syscalls and check if the return address is outside NTDLL.
• Hell's Gate
  • Hook the NT functions.
• Halo's Gate / Tartarus Gate
  • Hook every single one of the NT function (the objective in here is to make Halo's Gate cant find ANY Syscall ID).
  • Use IntrumentationCallback to detects syscalls and check if the return address is outside NTDLL.
  • Use vaccinated-NTDLL from SyscallShuffler.
• FreshyCalls / SysWhispers2 / "get syscall ID from sorting the syscall stub address"
  • Implant a modded-NTDLL where the Syscall ID doesnt correspond with the position of the syscall stub on memory.
  • Use IntrumentationCallback to detects syscalls and check if the return address is outside NTDLL.
  • Use vaccinated-NTDLL from SyscallShuffler.
• SysWhispers1 / "include your own syscall stub on your program"
  • Use IntrumentationCallback to detects syscalls and check if the return address is outside NTDLL.
  • Detect syscall instruction inside PEs

• https://www.cyberbit.com/blog/endpoint-security/malware-mitigation-when-direct-system-calls-are-used/
• https://www.mdsec.co.uk/2020/12/bypassing-user-mode-hooks-and-direct-invocation-of-system-calls-for-red-teams/
• https://alice.climent-pommeret.red/posts/direct-syscalls-hells-halos-syswhispers2/
• https://outflank.nl/blog/2019/06/19/red-team-tactics-combining-direct-system-calls-and-srdi-to-bypass-av-edr/