A Blog about malware and file formats

What started like an easy unpacking session to fill a Friday afternoon lead us to a singular black-SEO campaign. Together, we will unravel 4 different malicious loaders written in 4 different programming languages, briefly analyse the final 10MB black-seo client and reverse engineer its command and control protocol. All of this for XXL swimsuits.

In this tutorial, we will see how to use Malcat editing capabilities to reduce the size of a python bytecode file (.pyc) to its minimum. This article is the write-up for our Binary Golf Grand Prix 4 entry.