LADD

Linux Anti-Debugging Detection Tool

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LD_PRELOAD environment variable

This environment variable is loaded before every library in the system (including the C runtime, libc.so). Thou, malwares can use it, by loading themselves and gain persistence using a command like export LD_PRELOAD=/malware_path.

PTRACE_TRACEME Syscall

Many debuggers, like gdb use this syscall for attach the debugger to the target process. The PTRACE_TRACEME syscall can be used one time per process. Due to that reason, malwares can make a call to that syscall before the program's entry point, so no other similar syscall can be made. Or in other words, the process can not be debugged.

/proc/{pid}/status

This file contains information about the process with the relevant PID. One of them is the TracerPID parameter. When a process is running under debugger, the TracerPID parameter contain the PID of the parent process - the debugger. Otherwise, it will contain 0.

Copyright (c) 2022 Barak Aharoni. All Rights Reserved.