Axel "Ago" Gembe, a German programmer also known for leaking Half-Life 2 a year before release, was responsible for writing the first version.
Agobot is a multi-threaded and mostly object oriented program written in C++ as well as a small amount of assembly.
An infectious Agobot can vary in size but is typically around 12 to 500 kilobytes depending on features, compiler optimizations, and binary modifications.
It has rather odd characteristics for a virus, with the unique ability to download and install random files (perhaps to create more sharers) from its members, such as music, pornography, and even full games.
This worm also opens a backdoor on a random TCP port, notifies attackers through a predetermined IRC channel, and attempts to terminate various security products and system monitoring tools.