First published: 31st October 2007
Russian anti-virus developer Kaspersky Labs has published their statistics of the most prevalent viruses in September 2007. They noted that their predictions for September were not entirely accurate, with all Warezov variants dropping of the Top Twenty list, and Netsky.q, in first place again, has become the most widespread malicious program in the history of the Internet.
| Position | Change in position | Name | Percentage |
|---|---|---|---|
| 1 | - | Email-Worm.Win32.NetSky.q | 25.22% |
| 2 | +1 | Email-Worm.Win32.NetSky.aa | 10.83% |
| 3 | +3 | Email-Worm.Win32.Mydoom.l | 10.04% |
| 4 | -2 | Email-Worm.Win32.Bagle.gt | 7.62% |
| 5 | Return | Email-Worm.Win32.Nyxem.e | 6.03% |
| 6 | -2 | Net-Worm.Win32.Mytob.c | 5.18% |
| 7 | -2 | Worm.Win32.Feebs.gen | 4.69% |
| 8 | -1 | Email-Worm.Win32.NetSky.t | 3.03% |
| 9 | New | Trojan-Spy.HTML.Paylap.bg | 2.62% |
| 10 | - | Email-Worm.Win32.NetSky.b | 2.62% |
| 11 | - | Email-Worm.Win32.NetSky.x | 2.35% |
| 12 | - | Email-Worm.Win32.Scano.gen | 1.72% |
| 13 | -5 | Exploit.Win32.IMG-WMF.y | 1.58% |
| 14 | -5 | Net-Worm.Win32.Mytob.t | 1.38% |
| 15 | +3 | Net-Worm.Win32.Mytob.dam | 1.35% |
| 16 | - | Email-Worm.Win32.Womble.a | 1.06% |
| 17 | Return | Email-Worm.Win32.NetSky.d | 1.03% |
| 18 | -5 | Net-Worm.Win32.Mytob.u | 0.97% |
| 19 | Return | Email-Worm.Win32.Mydoom.e | 0.93% |
| 20 | Return | Email-Worm.Win32.NetSky.y | 0.83% |
| Other malicious programs | 8.92% |