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Metame : Metamorphic Code Engine For Arbitrary Executables

Metame is a simple metamorphic code engine for arbitrary executable. Metamorphic code is code that when run outputs a logically equivalent version of its own code under some interpretation.

This is used by computer viruses to avoid the pattern recognition of anti-virus software. It implementation works this way:

  • Open a given binary and analyze the code
  • Randomly replace instructions with equivalences in logic and size
  • Copy and patch the original binary to generate a mutated variant

It currently supports the following architectures:

  • x86 32 bits
  • x86 64 bits

Also, it supports a variety of file formats, as radare2 is used for file parsing and code analysis.

Example of code before and after mutation:

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Installation

pip install metame

This should also install the requirements.

You will also need radare2. Refer to the official website for installation instructions.

simplejson is also a “nice to have” for a small performance boost:

pip install simplejson

Usage

metame -i original.exe -o mutation.exe -d

Use metame -h for help.