The spamming capabilities of botnets caught interest of cybercriminals and soon new dedicated malware started to appear, like Beagle or Bobax. It was specialized in data stealing, but also performed spam attacks on popular instant messengers. The next step was made in 2003 by SpyBot. It was back-dooring infected systems, blocking popular antivirus software and downloading payloads for next stages of attacks. Its modular structure was something innovative for the time. The evolution of botnets was boosted in 2002 by the release of SDBot source code (writen in C++). In 2000 a mIRC-based bot appeared called GTbot (Global Threat bot) that was used to perform DDoS attacks. The first malicious programs that introduced the concept of master-slave relationship between an infected computer and a command server were Sub7 and PettyPark which derived from Remote Administration Tools, like the popular NetBus.Īt that time, the popular way of sending commands to botnet agents were IRC channels.
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