BitDefender’s 2007 Top 10 malware list includes:

1. Trojan.Peed.Gen
33.94%
2. BehavesLike:Trojan.Downloader
24.86%
3. Win32.Netsky.P@mm
6.49%
4. Trojan.Peed.A
2.13%
5. Win32.Nyxem.E@mm
2.13%
6. Win32.Sality.M
2.06%
7. Win32.NetSky.D@mm
2.06%
8. Win32.Virtob.2.Gen
1.60%
9. Win32.Netsky.AA@mm
1.49%
10. Trojan.Peed.P
1.17%