totalstation.blogg.se - Exe to autoit script converter online

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UPX0 in all loaded modules is a more elegant way to identify Exe2Aut's injected module, as none of the other DLLs would normally be UPX packed. Walking the Process Environment Block to check for a loaded module with the presence of the section name. I have chosen this approach because it’s more reliable and harder to detect.

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It is also possible to search for the (UPX packed) DLL on disk, as it is placed in the Windows %TEMP% directory under a random file name before being injected. Next, I wrote a small assembly shellcode to walk through the PEB_LDR_DATA structure in the Process Environment Block to check for the presence of the DLL injected by Exe2Aut.

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rsrc section to read / write in the portable executable (PE) header. Two of them are decoy scripts, while the third is a real one. I have compiled three different AutoIt scripts and added those as resources to the. For Exe2Aut, the script resource name for the decoy and real script is renamed at runtime to make it decompile the wrong code. The decoy script for MyAut2Exe is placed before the real bytecode as explained earlier. Once decompiled by either Exe2Aut or MyAut2Exe, one of the decoy scripts gets decompiled instead of the real code. The idea is to have a compiled AutoIt executable with three different bytecodes. Theory is all nice and well, but in the world of cybersecurity, a proof of concept (POC) is worth far more than any theory. As the parsing and decompilation stops on the first occurrence of the magic bytecode sequence, MyAut2Exe can be easily tricked into decompiling a decoy script as long as it's placed at a lower offset than the real compiled script resource. Once found, it extracts and decompiles the code. When the "automate" functionality is used, MyAut2Exe parses the executable for AutoIT magic bytecode signatures. This brute forces the decompiler settings until a script is successfully decompiled. To take the hassle out of correctly configuring it, it comes with a feature called "automate". Therefore, it has more settings to adjust the extraction and unpacking of the compiled script code. It supports multiple versions of AutoIT and AutoHotkey compiled scripts.

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Unlike Exe2Aut, MyAut2Exe extracts the bytecode resource and unpacks and decodes it without the help of the embedded interpreter - making it a full static decompiler because of this, there is no risk of accidentally executing anything. Exe2Aut injected module What About MyAut2Exe? By doing so, we can trick Exe2Aut to decompile a decoy script instead of the real script, which is executed when running the application.

#Exe to autoit script converter online code#

Due to this, it's possible to add code to detect the injection and change its behavior. This hooks the function that will execute the bytecode and decodes the bytecode back to the function names instead - making it a dynamic approach. The target binary will write the decompiled autoIT script to the current working directory.īecause of this, you can conclude that Exe2Aut utilizes the embedded interpreter to decrypt and decompress the script bytecode and extracts this by injecting a dynamic link library (DLL) into the target binary.tmp file is injected in the target binary.

The target binary is loaded as a child process of Exe2Aut.

tmp file is written to the %TEMP% folder. If you would dynamically analyze Exe2Aut during decompilation, you would notice the following: The decompression of the bytecode is performed by the compiled AutoIT binary before it is interpreted and executed. The creators of AutoIT have taken some measures against easy decompilation and applied a form of compression and encryption on the bytecode. Exe2Aut disclaimer What is a “Compiled” AutoIT Executable?Ī compiled AutoIT executable basically consists of two parts: a standalone AutoIT interpreter and the compiled script bytecode present as a resource in the PE file. In this writeup, I will explain how the two most common AutoIT decompilers (Exe2Aut and myAut2Exe) work and how they can be tricked into decompiling a decoy script instead of the real script. This triggered my interest in how this decompiler works and how AutoIt scripts are compiled in the first place. During the analysis of an AutoIT compiled malware sample, a message box popped up indicating the possible execution of the sample when using Exe2Aut decompiler.