I would recommend nomalua it's a backdoor scanner that tells you where the backdoor can be located.
This is the git download for it, instructions are there:
https://github.com/THABBuzzkill/nomalua
Garry's Mod
Backdoor Site
Submitted by XrayModz, 02-01-2019, 09:27 PM, Thread ID: 114832
Thread Closed
RE: Backdoor Site 03-01-2019, 05:45 PM #2
03-01-2019, 05:45 PM
#2