The Instrlen plugin is a tool for IDA Pro that allows for setting the length of an instruction to a custom value. This can be useful when the code is obfuscated or there are jumps after the instruction prefixes.
To install the Instrlen plugin, follow these steps:
- Copy the
instrlen.(dll|dylib)file to the IDA plugins folder. - Launch IDA Pro.
- Go to the instruction you want to change the length of.
- Navigate to the
Edit/Pluginsmenu. - Choose
Change Instruction Lengthfrom the list of plugins and enter the desired length.
To build the Instrlen plugin, you will need to use the ida-cmake build system.
Please refer to the ida-cmake documentation for instructions on how to set up and use the build system.
Once you have set up the ida-cmake build system, you can build the Instrlen plugin by running the following commands:
git clone https://github.com/milankovo/instrlen
cmake -B build64 -DEA64=YES -S src/
cmake --build build64 --config Release
Note: The Instrlen plugin is compatible with IDA Pro 9.0. While it has been tested with this version, it might be possible to use it with previous versions of IDA Pro.
