RenameLocalVars

RenameLocalVars is an IDA plugin that renames local variables to something easier to read. For example, var_F8 would be renamed to _ceres. The names are arbitiary math terms. RenameLocalVars does not rename arguments or variables already named by IDA's analysis.

Installation

RenameLocalVars has to be installed as an IDA Plugin. The following steps can be used to install the plugin.

git clone https://github.com/alexander-hanel/RenameLocalVars.git
cd RenameLocalVars
copy rename_local_vars.py %IDAUSR%\plugins 

Note: if %IDAUSR% is not present or you don't know where this path is on your host, it can be found using IDAPython from the Output Window.

Python>import ida_diskio
Python>ida_diskio.get_user_idadir()
'C:\\Users\\yolo\\AppData\\Roaming\\Hex-Rays\\IDA Pro'

If a directory named plugins is not present, it needs to be created.

Usage

Right Click > Rename Local Variables

Example Output

Before

.text:0000000180087A1C var_108         = qword ptr -108h
.text:0000000180087A1C var_100         = qword ptr -100h
.text:0000000180087A1C var_F8          = qword ptr -0F8h
.text:0000000180087A1C var_F0          = qword ptr -0F0h
.text:0000000180087A1C var_E8          = qword ptr -0E8h
.text:0000000180087A1C var_E0          = _LARGE_INTEGER ptr -0E0h
.text:0000000180087A1C var_D8          = qword ptr -0D8h
.text:0000000180087A1C var_D0          = qword ptr -0D0h
.text:0000000180087A1C var_C8          = qword ptr -0C8h
.text:0000000180087A1C var_C0          = qword ptr -0C0h
.text:0000000180087A1C var_A0          = qword ptr -0A0h
.text:0000000180087A1C var_98          = qword ptr -98h
.text:0000000180087A1C var_90          = qword ptr -90h
.text:0000000180087A1C var_88          = qword ptr -88h
.text:0000000180087A1C var_80          = qword ptr -80h
.text:0000000180087A1C var_78          = qword ptr -78h
.text:0000000180087A1C var_60          = qword ptr -60h
.text:0000000180087A1C var_58          = qword ptr -58h
.text:0000000180087A1C var_50          = qword ptr -50h
.text:0000000180087A1C var_48          = _UNICODE_STRING ptr -48h
.text:0000000180087A1C arg_0           = qword ptr  10h
.text:0000000180087A1C arg_8           = _LARGE_INTEGER ptr  18h
.text:0000000180087A1C arg_10          = qword ptr  20h
.text:0000000180087A1C arg_18          = qword ptr  28h
.text:0000000180087A1C arg_20          = dword ptr  30h
.text:0000000180087A1C arg_28          = dword ptr  38h

After

.text:0000000180087A1C _abacus         = qword ptr -108h
.text:0000000180087A1C _aeon           = qword ptr -100h
.text:0000000180087A1C _alpha          = qword ptr -0F8h
.text:0000000180087A1C _arc            = qword ptr -0F0h
.text:0000000180087A1C _atlas          = qword ptr -0E8h
.text:0000000180087A1C _baryon         = _LARGE_INTEGER ptr -0E0h
.text:0000000180087A1C _beta           = qword ptr -0D8h
.text:0000000180087A1C _carat          = qword ptr -0D0h
.text:0000000180087A1C _ceres          = qword ptr -0C8h
.text:0000000180087A1C _chaos          = qword ptr -0C0h
.text:0000000180087A1C _chi            = qword ptr -0A0h
.text:0000000180087A1C _dean           = qword ptr -98h
.text:0000000180087A1C _delta          = qword ptr -90h
.text:0000000180087A1C _epsilon        = qword ptr -88h
.text:0000000180087A1C _eta            = qword ptr -80h
.text:0000000180087A1C _fermat         = qword ptr -78h
.text:0000000180087A1C _gamma          = qword ptr -60h
.text:0000000180087A1C _gaudi          = qword ptr -58h
.text:0000000180087A1C _gnomen         = qword ptr -50h
.text:0000000180087A1C _ides           = _UNICODE_STRING ptr -48h
.text:0000000180087A1C arg_0           = qword ptr  10h
.text:0000000180087A1C arg_8           = _LARGE_INTEGER ptr  18h
.text:0000000180087A1C arg_10          = qword ptr  20h
.text:0000000180087A1C arg_18          = qword ptr  28h
.text:0000000180087A1C arg_20          = dword ptr  30h
.text:0000000180087A1C arg_28          = dword ptr  38h

Note

I'm not sure how this works on the decompiler view. I don't have a personal copy of the decompiler so I didn't test it.