Beacon Object File (BOF) that spawns an arbitrary process from beacons memory. Supports Parent Process ID (PPID) spoofing & blocking non-MS signed DLLs from loading into the processes memory (some EDR DLLs).
- CNA Agressor Script interface
beacon> help
spawn Spawn a process with a spoofed PPID and blockDll
beacon> help spawn
Synopsis: spawn /path/to/exe PPID
beacon> ps
8264 5536 OneDrive.exe x86 1 DESKTOP-KOSR2NO\boku
beacon> spawn cmd.exe 8264
[*] SPAWN (@0xBoku|github.com/boku7)
Opened handle 0x634 to process 8264(PID)
Success! Spawned process: cmd.exe | PID: 5384 | PPID: 8264- PPID Spoofing
- Cobalt Strike "like"
blockdllfunctionality
x86_64-w64-mingw32-gcc -c spawnSuspendedProcess.c -o spawnSuspendedProcess.o- After compile import the spawn.cna script into Cobalt Strikes Script Manager
beacon> spawn /path/to/exe PPIDAgressor script for better end user experience
PPID spoofing for better parent-child process relation OPSEC
- Here we can see our
cmd.exeprocess being spawned with the PPID asOneDrive.exe
- Here we can see our
implement Cobalt Strikeblockdllfunctionality to prevent non-MS signed DLLs from loading into the spawned processes memory
- We see the parent-child process relationship, and that our spawned process has been created with the
Signatures restricted (Microsoft only) - The
Signatures restricted (Microsoft only)makes it so DLL's not signed by Microsoft cannot be loaded into our spawned process
- We see the parent-child process relationship, and that our spawned process has been created with the
Do not crash the beacon process when the PE file does not exist
- No longer crashes on process creation failure!
Return the PID to the Cobalt Strike console when the new process is spawned
- Build out different methods of remote process injection
- Build out different methods of remote process patching
- NTDLL.DLL remote process Unhooking
- ETW remote process Patching/Bypass
- AMSI remote process Patching/Bypass
- CLR Loading & .Net assembly injection
- Spawning the same process for every fork-and-run seems like bad/predictable OPSEC to me.
- There are probably methods for this out there or built into CS already. Either way, I wanted to build my own.
- Credit/shoutout to: Adam Chester @xpn + @SEKTOR7net + Raphael Mudge
- Thank you for the amazing work that you've contributed. I would not be able to publish this without your blogs, videos, and awesome content!
- Main References for PPID Spoofing & blockdll