Nimfilt is a collection of modules and scripts to help with analyzing Nim binaries. It started out as a CLI demangling tool inspired by c++filt.
It evolved into a larger set of tools for analyzing Nim, but the original name stuck.
nimfilt.py: a Python module that implements demangling for Nim. It can also be run as basic CLI tool.id_nim_binary.yar: a set of YARA rules to identify Nim ELF and PE binaries.nimimfilt_ida.py: Nimfilt for IDA, an IDApython script to help reverse-engineers handle Nim binaries.Nim is compiled to another language (usually C/C++) before being compiled to a native executable. It also doesn’t include a large runtime.
However, the process still leaves some Nim-specific artefacts and specificites in in the produced binary.
For one, method and module names are mangled using, Nim’s own name scheme which is distinct from C++’s.
This scheme isn’t documented so I relied on the source code of the Nim compiler.
Most of this name mangling in implemented in compiler/msgs.nim and compiler/ccgtypes.nim.
The IDAPython script can be run as a one-off or installed as a plugin.
If running as a script, simply launch it from the Nimfilt project directory. It is recommended to do so after auto-analysis has completed and you’ve loaded any additional FLIRT signatures.
Add <nimfilt_project_dir>/nimfilt_ida.py to your your plugins.list as per their instruction on installing plugins.
nimfilt.py to a directory that is included in your IDAPython’s PYTHONPATH (commonly <IDA_install_dir>/python/ or %APPDATA%/Hex-Rays/IDA Pro/python/3/).nimfilt_ida.py to your IDAPython plugin directory (usually <IDA_install_dir>/plugins/)*Note: The current version of Nimfilt for IDA only supports one command which runs all analyses. *
Navigate to Edit -> Plugins -> Nimfilt and click on it.
You can set Nimfilt to automatically execute when a loaded file is recognized as a Nim binary. To do so, set the AUTO_RUN global variable to True in nimfilt_ida.py
Current features include:
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