February saw Virtumonde, an entire family of adware programs, claim top spot. The leader for the last two months, Trojan.Win32.dialer.yz, slipped to third place. One of the components of the malicious Bagle family, consisting of email worms and Trojan-Downloaders, continue to multiply one of them even ended up in second place in the rankings, with another at seventeenth. The veteran worm Brontok.q continues its travels up and down the rankings.”]
Source: https://securelist.com/online-scanner-top-twenty-for-february-2008/36195/