BBC News: In a blog post, Microsoft wrote that it believes Andrey Sabelnikov "wrote the code for and either created, or participated in creating, the Kelihos malware." At its peak, the Kelihos botnet infected 41,000 systems, which it used to send more than 3.8 billion spam emails.
Sabelnikov worked for Russian antivirus vendor Agnitum between 2005 and 2008. An Agnitum spokesperson noted, "Afterwards our ways parted. Seems that he chose the wrong route afterwards."