Questions tagged [anti-debugging]

Any techniques or tricks used to prevent, mitigate or detect an attempt to run the software within a debugging environment.

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Android app crashes even while not edited, how can I solve it?

Installed an application from google playstore and then transferred to it my computer to apparently edit it and without any changes I made to it then I tried to install it through ADB, well the ...
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2answers
91 views

Finding call trace of a crashing executable with anti-debugging techniques

The application I target has terribly annoying anti-debugging techniques. With x32dbg and ScyllaHide with the following configuration, the application exits immediately as soon as a breakpoint is hit, ...
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How to disable macOS anti-debugging from within the process

I'd like to start lldb debugger on securityAgent process that is blocked by apple. It seems like this process is protected against debuggers, but perhaps there's a way to allow it from within a ...
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23 views

send screenshot to server if client is found under debug

if the client under debug detect there are some debugger attached, like throwing out single step exception, will it take a screenshot of my desktop then send to its server to prove that I am trying to ...
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0answers
63 views

Anti-debug clearing hardware breakpoints

An application I am debugging somehow manages to clear my hardware breakpoints. I am using TitanHide and x64dbg. I am observing the following behaviour: When placing the first hw breakpoint, it is ...
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1answer
76 views

Getting NTSTATUS 0xC0000022 when attempting to debug a process

I am attempting to debug a process with windbg (with admin privileges) and I am getting the following error: Could not attach to process XXXX =, NTSTATUS 0xC0000022 {Access Denied} A process has ...
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70 views

Pe file Vmp0 vmp1 section,

I have a PE file with section vmp0 vmp1, possible protected with VMProtect. I am using local debugger in IDA pro, the program will detect the debugger and pop-up an message box and quit , I used the ...
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69 views

unpacking Armadillo-packed exe on Windows 10

I was trying to unpack the Armadillo-protected target from this webpage Armadillo 4.30a with Debug Blocker - manually unpacking on Windows 10. However, I got another child process spawning again after ...
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2answers
113 views

How to solve this anti-disassembler trick?

I have this __asm instruction in C code: int func_0x8b4c55a0() { __asm { call $ +5 add[esp],5 ret } } int main() { char cVar1; if ((cVar1 = ...
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1answer
162 views

What is the usual way to determine if a Game uses KernelMode or UserMode Anti cheat?

How does one find out if a game uses KernelMode anti cheat or UserMode? For example the Game Black Desert Online uses Xigncode. If i google a bit about Xigncode i immediately find out that: "...
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38 views

Is it possible to define the adress of a function in assembly?

I am creating a PoC for anti-disassembly techniques, and I would like to know if there were ways to define the address of functions once compiled with gcc. Here is the PoC program : BITS 32 EXTERN ...
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93 views

How to defeat fake rdtsc driver?

This RSE thread and this one discuss effectiveness of RDTSC-based anti-debug methods, and also a way to possibly work-around (albeit using a fake driver method, which is complex). What is a counter-...
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153 views

Advanced Anti-Debugging Techniques

I was wondering what are some advanced AntiDebugging techniques that more advanced than the basic ones like IsDebuggerPresent and CheckRemoteDebuggerPresent?
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148 views

How to virtualize part of a code like VMProtect does?

I am a new student in the field of cybersecurity. I would like to learn more about how virtualization used by software such as CodeVirtualizer and VMProtect works, and ideally to be able to ...
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1answer
375 views

anti-debugger techniques for shared library

I'm adding copyright protection to a demo version of a shared library. I've seem some recommendations to add timing around license violation detection codes -- which would be debugger + patch targets ...
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84 views

Process terminating when breakpoint reached

I want to set breakpoint on the recv function to replace the received packets. But, I can not put breakpoint on any instruction in the program, the process simply closes with code 4000001f. I also ...
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2answers
236 views

Debug program using peculiar anti-debugging technique

In my BA thesis, I wanted to present a program for Windows, using various anti-debugging techniques. One of them, which I came up on my own (possibly it is well known, but I didn't find it anywhere) ...
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1answer
214 views

Program closing even with IsDebuggerPresent Patched!

i'm in some serious problems when trying to debug a program with ollydbg, i patched IsDebuggerPresent but still after starting debugging with it patched it will Terminate anyways. Steps i Followed ...
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1answer
821 views

Bypassing anti-debugging

I'm trying to RE Stardew Valley to write cheats for it. The problem is that when I trace the pointers for my health/energy/etc... back more than one level the game crashes. It probably has some kind ...
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1answer
73 views

Can any one de-obfuscator this php code [closed]

my developer has changed all his contact info and i am unable to contact him and i want to move my site to another server but because of this obfuscator code in my php script i am unable to move my ...
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1answer
495 views

Anti-disassembler techniques and IDA Pro

I am a newbie to RE and IDA Pro 7.2, and I am working my way through the book Practical Malware Analysis. I'm currently working on the lab 15-01 problem in the anti-disassembler chapter, but am having ...
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1answer
243 views

Fork and Waitpid calls in a CTF linux binary

I'm doing one of my first linux crackmes. In the first blocks of code, it goes inside some anti-debug routine and inside one of those it forks and after it calls a waitpid routine. I can verify it ...
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2answers
315 views

Jump in the middle trick

I'm reversing a program that "hides" some instructions using the jump in the middle trick. This trick is a jump to a middle of an instruction, whereas the real address actually contains another opcode....
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1answer
159 views

Radare2 does not display the entire assembler code

I am trying to solve this ELF - Ptrace crack me. Here are the commands I use : I start radare2 with the crack me as argument. radare2 ch3.bin I decide to go to the main and print the assembly code ...
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1answer
448 views

How int3 looks like in C

This is assembly code that can catch debugger with int 3 : MOV ECX, ExceptionHandler MOV DWORD PTR FS:[0], ExceptionHandler INT3 ///there is debugger!!! ExceptionHandler: ////no ...
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1answer
294 views

What is __sighandler_t struct and purpose of SIGTRAP signal handler

I'm reversing an ELF x86 binary which apparently has anti-reversing/anti-debuging protections, and one of the first thing the ELF does is to call a sys_signal with a SIGTRAP value : .text:08048063 ...
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1answer
131 views

dongle check happen before a debugger start debugging

i'm trying to fake the test ( dongle exist ) but one problem that i encounter is that the application detect it before i start debugging it . this is what happen with more details : open( not ...
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1answer
1k views

VMProtect anti-debug method

I recently found a nice crackme which uses VMProtect 3.x as defense. After doing a little research online I found couple of API's VMProtect uses as an anti debug method. I set software breakpoint on ...
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1answer
286 views

What is happening with these exceptions in OllyDbg?

I am trying to reverse engineer something which appears to purposely create exceptions as part of its logic. In the image below, there are multiple DIV EAX commands that generate division by 0 ...
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1answer
237 views

Searching for a sequence of bytes in IDA

Using an hardware breakpoint, I found with Ollydbg that a crackme was checking for the isDebuggerPresent flag. I'd like to find this part of the code using IDA now. I first looked in the import table,...
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0answers
211 views

Instruction counting anti-debug

I recently came across this anti-debug technique being used in the wild. In The Ultimate Anti-Debugging Reference, the author wrote in the "Instruction Counting" section A debugger will interfere ...
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225 views

debugger trap with angr

Let's suppose this (very ugly) c code: #include <stdio.h> #include <string.h> #include <signal.h> char sav_argv[100]; void on_sigtrap(int signo) { if (strcmp(sav_argv, "hello")...
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1answer
746 views

Trap Flag - Anti-debugging trick

I am trying to reverse a program which is employing some kind of anti-debugging trick based on the use of SEHs and the TF. The code stars with: So apparently it's generating an exception with XOR ...
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1answer
874 views

Thread EntryPoint in TLS callback as AntiDebug technique

I came across a document called The Ultimate Anti-Reversing Reference, which describes various Anti-Debugging techniques. in point 4.Thread Local Storage There is a mention Thread Local Storage ...
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0answers
205 views

Failed to set breakpoint (Anti-debug protection)

Sorry for my bad English in advance. There is a program that has some protection. The problem is I can not set hardware and software breakpoints in x64dbg (to be more precise - not everywhere), cuz ...
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2answers
2k views

How to skip on int 3 when ida debug?

I tried to debug a windows application, but when I debug it with Ida, it stopped on int 3 instruction. I read that int 3 catch debugger so I cant debug. How can I cancel this int 3? How call to int ...
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1answer
2k views

How to fix anti-debugger with DbgUiRemoteBreakin

I have windows application that I want to debug. When I open it with ollydbg and attach to this application process I see attached process paused at ntdll.DbgBreakPoint when I press Play I see ...
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1answer
93 views

Cant debug software with ida [closed]

I have software that run on windows well. I tried to debug it with IDA (local win32 debug) but when I start it I see that exeption throw and I cant debug it. I dont use breakpoints Is that anti ...
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1answer
1k views

VMProtect keygen, turn off the anti-debugging

who faced with VMProtect? I just found on the Internet crackme and decided to grunt it, but unfortunately not that good of it did not work out, as the message about prevention of debugging climbed out....
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4answers
13k views

Finding OEP in a VMProtect v3.0 protected malware

I've been trying to reverse engineer a malware that has been packed with VMProtect v3.0. My first instinct was to google an automated way for this and I found a script. Unfortunately the script to ...
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1answer
406 views

How can I circumvent rdtsc when used as an anti-debugger technique?

I using x86dbg and am working on unpacking a target. The unpacking stub appears to be using some anti-debugging techniques - most of which I can detour with a plugin. However, there are a lot of ...
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1answer
637 views

Working backwards from a popup

I'm currently trying to reverse engineer a game,but there's and anti-debug, so far the only leads I've tried to follow are: I found an IsDebuggerPresent API, I tried to change the value of EAX by ...
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1answer
5k views

Bypass IsDebuggerPresent

I have an address, that I think is not allowing me to run the debugger in IDA, I need help trying to stop it. Also , what does kernel32_IsDebuggerPresent mean?
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1answer
126 views

Help with anti-disassembly trick inside a hooked function

I am trying to understand a hook installed by a program within the Win32 API function ZwWriteVirtualMemory. It seems that a jmp inside an instruction is used and I couldn't fix it to be able to ...
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1answer
4k views

Detecting hardware breakpoints

Since software breakpoints, unlike hardware breakpoints , do change the code, it's relatively easy to write a program that performs a checksum on itself as an anti-debugger technique. Is it possible ...
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0answers
148 views

Anti-debug that can broke programm links (branches)?

I met the unknown (for me) method of anti-debugging today, while debugging in IDA Pro. This method delete fast all branches in file and the programm will look similar like on the image: ...
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1answer
3k views

How to investigate Windows 32/64bit (WOW64) transition

There is surprisingly little information about Windows WOW64 mechanism. I'm trying to investigate it. So when we have system call in 32-land, it calls an address that is stored in FS, which leads us ...
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1answer
978 views

C++ Anti Kernel Debugger?

What are some things I can do to do anti kernel debugging from user-mode C++? I already use ZwQuerySystemInformation to query for SystemKernelDebuggerInformation.
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1answer
201 views

Anti-Reverse Question on implementing a Shellcode

I am trying to make things harder for someone to reverse my code. I think that implementing a shellcode following this article could work for my case. How can I access (or share) global variables in ...
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2answers
2k views

Immunity debugger anti anti debug

I using Windows, and I was wondering what is the best anti anti debug plugin that exist, I tried to use hidedebug by Bob -> Team PEiD, but unfortunately it catch only the regular ways, I know that ...