Trojan-spy has been the dominant type of threat on end user machines during the past month. Trojan downloaders are probably the most widespread threat at this point in time we have 3 of them in the top 5 places in the ratings. Trojan-downloader.Win32.Delf.alf is the leader: Delf.alf was emailed using spammer technologies to infect a machine it then downloaded LdPinch from the Internet. Hidrag.a and Redlof.a are among the more widespread viruses that constitute a real threat.”]
Source: https://securelist.com/top-20-online-april-2006/36083/