Schallner beginners guide to basic linux anti anti. They are used by commercial executable protectors, packers and malicious software, to prevent or slowdown the process of reverseengineering. This is a very simple demo of an anti debugging idea that randomly popped into my mind. A ptrace antidebugging trick learning linux binary analysis. I am learning some anti debugging techniques on linux. Calling them a pita doesnt quite match the pain and suffering experienced by us having to deal with them.
Antidebugging scheme for protecting mobile apps on android. As i see those techniques are still used in applications and crackmes, this paper should show a how easy and. Elf antidebugging and packing techniques in the next chapter, breaking elf software protection, we will discuss the ins and outs of software encryption and packing with elf executables. Beginners guide to basic linux anti anti debugging techniques general discussion beginners guide to basic linux anti anti debugging techniques exetools exetools general.
Often the pivotal factor in achieving development timetables comes down to ones efficiency in finding and fixing bugs. Windows antidebug reference antidebugging downloads. Debugmenot is a collection of simple anti debugging tricks targeting gdb lldb on linux. Now in this tutorial, were going to look at other ways we can use anti debugging techniques to detect whether a debugger is being used to debug. Maybe in another post i will show how to bypass more difficult techniques if anyone requests it. Note that some applications with anti debugger injection techniques. Five anti analysis tricks that sometimes fool analysts posted.
Counterpunching antidebugging methods with winappdbg and. His passion is also antivirus bypassing techniques, malware research and operating systems, mainly linux, windows and bsd. This article presents popular anti debugging techniques. As is the case with the generalclass of adversarial. A timebased antidebugging technique using the kernel transaction manager anti debugging techniques have been known for a long time. Another technique often used in malware and commercial products is self debugging. Antidebugging scheme for protecting mobile apps on. Jdas makes use of static slicing techniques and dynamic aspects to provide the user with the. For a complete solution which defeats most anti debugging techniques in an automated fashion, have a look at the source code of ida stealth, a plugin for the popular interactive disassembler. In the previous tutorial, weve talked about techniques that harden the reverse engineering of the executable and then we looked at anti debugging techniques. Introduction into windows antidebugging codeproject. Since gdb usually sets initial breakpoint in main, it takes care of the default situation.
This paper is an introduction for anti anti debugging techniques on the linux os. It is useful for the more securityparanoid of network and supports fixing any bugs raised by the users. The best way to be prepared for an attack is to know where one could come from. If an antidebugging technique causes you to have to develop new techniques in kernel debugging, then it is not merely an overrated gimmick, and it has done its job. Anti debugging protection techniques with examples in terms of software, reverse engineering is the process of researching a program to obtain closed information about how it works and what algorithms it uses. Anti debugging protection techniques with examples apriorit. Towards an understanding of antivirtualization and anti. Anti debugging techniques are ways for a program to detect if it runs under control of a debugger. So, when you attach a debugger to a program, it generates an interrupt interrupt.
As i see those techniques are still used in applications and crackmes, this paper should show a how easy and outdated those techniques are, and b. I am learning some anti debugging techniques on linux and found a snippet of code for checking 0xcc byte in memory to detect the breakpoints in gdb. The design and implementation of pin plugin tool to bypass. The main goal of various anti reverse engineering techniques is simply to complicate the process as much as possible. That is techniques to either fool, stop, or modify the process of debugging the target program. Also, your point about licensing seems irrelevant to me. Often when a hacker doesnt want their program to be easily debugged, they include certain anti debugging techniques. Experts at intezer discovered a new backdoor, dubbed evilgnome, that is targeting linux systems for cyber espionage purpose. Dec 22, 2014 we might also have to figure out what was process x doing at the time of hang. Anti debugging anti debugging is done acknowledging the fact that when a process is being debugged it is going to have a set of properties that would be different from when it is not debugged. The ptrace command can be used as an anti debugging technique. Anti debugging scheme for protecting mobile apps on android platform springerlink. So i have run into a lot of anti debugging techniques over the years and wanted to show how to bypass one of the simpler ones to start off with. Anti debugging is the implementation of one or more techniques within computer code that hinders attempts at reverse engineering or debugging a target process.
Weve mentioned the isdebuggerpresent function and analyzed it in depth. This paper classifies and presents several anti debugging techniques used on windows ntbased operating systems. Download citation the design and implementation of pin plugin tool to bypass anti debugging techniques pin is a framework that creates dynamic program analysis tools and can be used to. Rootkits allow attackers to hide their tools from other programs running on the same computer. Programming linux antireversing techniques index of es. Pelock is a software protection system for windows executable files exe protector. Viruses and malware are very commonly encrypted or packed with some type of protection mechanism, which can also include anti debugging techniques. Antidebugging techniques cheat sheet 0xaa random notes.
It is actively used by recognized publishers in copyprotection schemas, but is also used by malware to complicate its detection and elimination. May 17, 2016 so, when you attach a debugger to a program, it generates an interrupt interrupt. The ptrace command can be used as an antidebugging technique. Pelock protects your applications from tampering and reverse.
Experts spotted a rare linux desktop spyware dubbed. Elf antidebugging and packing techniques in the next chapter, breaking elf software protection, we will discuss the ins and outs of software encryption and. We use ida pro and the debugger to unpack a loki malware sample from a packer that has a ton of anti analysis, anti debug, and antvm tricks. Collection of simple anti debugging tricks for linux kirschjudebugmenot. Debugging inside the linux kernel can be quite challenging. From my ultimate anti debugging reference see pferrie. Anti re techniques in drm code jan newger seminar advanced exploitation techniques rwth aachen, germany. That is techniques to either fool, stop, or modify the process of debugging. It covers the very basic anti debugging techniques as introduced by silvio cesares paper 1 back in 1999.
Browse other questions tagged linux anti debugging or ask your own question. Apr 19, 2007 despite the documentedness of the int1int3 interfaces, subverting them is guaranteed to screw up conventional kernel debugging and unhooking them isnt the answer in this case. Elf antidebugging and packing techniques learning linux. How does the software calling isdebuggerpresent or whatever similar trick have an effect on how that software is licensed. Intezer spotted a new piece of linux malware dubbed evilgnome because it disguises as a gnome extension.
This article considers popular anticracking, anti reverse engineering protection techniques, namely antidebug methods in windows os. In this paper, to protect the android app from the attack using debugger, we propose anti debugging techniques for native code debugging and managed code debugging of android apps. Remote host linux kernel debugger through gdb provides a mechanism to debug the linux kernel using gdb gives you source level type of debugging kdb the linux kernel debugger kdb is a patch for the linux kernel and provides a means of examining kernel memory and data structures while the system is operational. Antidebugging requires a thorough understanding of the environment in which the program would be run. Here is stored a common structure used as marker to identify inside the vmlinux. Remote host linux kernel debugger through gdb provides a mechanism to debug the linux kernel using gdb gives you source level type of debugging kdb the linux kernel debugger kdb is a patch for the linux.
This is similar to the techniques showed in the coursera course malicious software and its. The checks performed by debugmenot include wellknown sanitychecks on the environment parent process, environment variables, ptrace. Anti debugging software free download anti debugging page 3. The modules used by evilgnome are reminiscent of the windows tools used. One known method are antianti tricks which circumvent the mentioned protection schemes. Home anti debugging capstone debugger detection disassembler makin malware x64 x86 makin reveal antidebugging tricks tuesday, december 19, 2017 6. There are a few user space debugging tools and techniques in linux which are quite useful in analysing user space problems.
Makin reveal antidebugging tricks hacking land hack. This paper confines to techniques and methods used for linux. Home antidebugging capstone debugger detection disassembler makin malware x64 x86 makin reveal antidebugging tricks tuesday, december 19, 2017 6. What follows is a selection of the known techniques. Detecting debugging this article describes anti debugger techniques for x86 linux though some of these techniques are not x86 specific. In this blog post, i will examine different anti debugging techniques and methods for countering those techniques using winappdbg and python. Programs can have event handlers that look for this particular interrupt and exit automatically when it. Beginners guide to basic linux anti anti debugging.
Five antianalysis tricks that sometimes fool analysts. Contribute to tobyxddlinuxantidebugging development by creating an account on github. Classic anti debugging techniques on linux are usually either checking tracerpid in procpidstatus or using ptrace to attach to the process and do nothing. Anti debugging techniques were designed to protect the intellectual property of compiled code. Weve seen two special techniques that can be used to detect whether a debugger is currently being used to run the executable or not. Detecting debugging introductionthis article describes anti debugger techniques for x86 linux though some of these techniques are not x86 specific. A timebased antidebugging technique using the kernel. In order to detect the presence of a debugger, malware can either read some values or it can use api present to detect if the malware is being debugged or not. In order to dissect such details, we will need the help of debugging tools. Ida signsrch ida pro plugin conversion of luigi auriemmas signsrch signature matching tool. This can be useful to the development of viruses and also to those implementing software protection. Collection of simple antidebugging tricks for linux kirschjudebugmenot. Antidebugging scheme for protecting mobile apps on android platform article in the journal of supercomputing 721 november 2015 with 1,005 reads how we measure reads.
Sep 18, 2008 for a pretty complete reference on anti debugging techniques under windows, consult peter ferries paper. The researchers attribute the spyware to the russialinked and gamaredon group. With the ptrace syscall it is quite easy to implement some simple linux anti debugging techniques. This is a really good question since this topic isnt as popular as anti debugging techniques. So i have run into a lot of antidebugging techniques over the years and.
Classic antidebugging techniques on linux are usually either checking tracerpid in procpidstatus or using ptrace to attach. It supports many techniques for mapping networks to overcome firewall and routers issues. Beginners guide to basic linux anti anti debugging techniques. Anti reversing schemes therefore always incorporate some form of anti ptrace madness. This article describes anti debugger techniques for x86linux though some of these techniques are not x86 specific. A ptrace antidebugging trick learning linux binary. Programs can have event handlers that look for this particular interrupt and exit automatically when it is found. Pelock protects your applications from tampering and reverse engineering, and provides extensive support for software license key management, including support for time trial periods.
Linux antidebugging techniques fooling the debugger. Many oldschool linux anti debugging tricks, such as monitoring the proc filesystem and detecting breakpoints in memory, work perfectly fine on android. As i see those techniques are still used in applications and crackmes, this paper should show a how easy and outdated those techniques. Now in order to frustrate the malware analyst, malware can be detected in the presence of debuggers and show up in unexpected events. This article presents popular anti debugging techniques, starting from the simplest, and notes how to bypass them. Especially the anti debugging techniques are painful, throwing uncatchable exceptions when trying to debug. Viruses selection from learning linux binary analysis book.
Elf antidebugging and packing techniques learning linux binary. This can be a good way to detect if a user is debugging our application and to terminate the application if that happens, which effectively prevents users from debugging our application. Antidebugging techniques cheat sheet jan 19 th, 2015 6. Often when a hacker doesnt want their program to be easily debugged, they include certain antidebugging techniques. Elf anti debugging and packing techniques in the next chapter, breaking elf software protection, we will discuss the ins and outs of software encryption and packing with elf executables. Due to the ingenuity of malware authors, this is far from a. Antidebugging and antivm techniques and antiemulation. In the next chapter, breaking elf software protection, we will discuss the ins and outs of software encryption and packing with elf executables. The above instructions are part of an anti debugging technique for. How to defeat antivm and antidebug packers with ida pro. Both licensing enforcement schemes for media codecs and drm for videoondemand downloads. Anti debugging techniques are ways for a program to detect if it runs under.
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