gofuscator

gofuscator is an obfuscator/polymorphic engine for Golang code.

Installation

Make sure you have Golang installed by running go version

git clone https://github.com/artemixer/gofuscator
cd gofuscator
go build gofuscator.go

Usage

./gofuscator -i input_file.go -o output_file.go

Here is a sample before and after the obfuscation process:

Functionality

Currently gofuscator is able to process strings, integers, floats, bools, hex values, imports and function/variable names

Function and variable names, as well as imports, are changed to a random string consisting of the ASCII a and the cyrilic а, which end up looking visually identical:

str1 -> аaааааaaaaаaaaaaааaa

rand.Read -> аaааааaaaaаaaaaaааaa.Read

Bools are changed to a random lesser or greater statement:

false -> (948 >= 6995)

Strings are decrypted from a base64 sequence of bytes :

"test" -> aesDecrypt((string(49) + string(78) + string(57) + ...)

Hexes are changed into declarations of corresponding bytes :

0x48, 0x65 -> (byte(72)), (byte(101))

And all of the above methods are reinforced by the way integers and floats are obfuscated, which is the main feature of this tool. Integers and floats are converted into a random sequence of mathematical operations, such as math.Sqrt, math.Tan and others. The corresponding math functions are called using reflect to avoid optimisations at compile-time. And finally, all relevant math functions are called through a randomly generated function array. This is the result:

-3 -> -(int(aaaaаaаaaaaааaааааaа.Round(aааaaaaаaааaaаааaaаа.ValueOf(aаaаaaaaаaaаaааaааaa[(int( aaaaаaаaaaaааaааааaа.Round(aааaaaaаaааaaаааaaаа.ValueOf(aaaaаaаaaaaааaааааaа.Cos).Call([]aааaaaaаaааaaаааaaаа.Value{aааaaaaаaааaaаааaaаа.ValueOf(5.415309898908408)})[0].Interface().(float64)/(0.6464489776185214*aaaaаaаaaaaааaааааaа.Pow(2, float64(-2))))))]).Call([]aааaaaaаaааaaаааaaаа.Value{aааaaaaаaааaaаааaaаа.ValueOf(5.8042675186492145)})[0].Interface().(float64)/aаaаaaaaаaaаaааaааaa[(int(aaaaаaаaaaaааaааааaа.Round(aааaaaaаaааaaаааaaаа.ValueOf(aaaaаaаaaaaааaааааaа.Sqrt).Call([]aааaaaaаaааaaаааaaаа.Value{aааaaaaаaааaaаааaaаа.ValueOf(7.908218581580884)})[0].Interface().(float64)*aaaaаaаaaaaааaааааaа.Tan(0))))](0.6766090278466431))))

This processing also applies to integers generated at all previous steps.

Notes

As const types cannot have values set by functions, they are converted to var upon processing.

If you are using non-default numeric variable types, make sure to explicitly declare them when passing to functions (ex. uint8(5)), as the parser has no way of knowing the real variable type and assumes int/float64

Feel free to open pull requests and issues, I will do my best to resolve or at least answer all of them