| 2004-07-27 | MegaBug |
| 2004-07-27 | Mefl (rodzina) |
| 2004-07-27 | Mecdon.1470 |
| 2004-07-27 | VBS.Mcon.b |
| 2004-07-27 | Maze (rodzina) |
| 2004-07-27 | Email-Worm.VBS.Mawanella |
| 2004-07-27 | Win98.Matyas |
| 2004-07-27 | Win95.Matrix |
| 2004-07-27 | I.Worm.Matcher |
| 2004-07-27 | Macro.Word.Master |
| 2004-07-27 | Massive.386 |
| 2004-07-27 | Email-Worm.Win32.Masana |
| 2004-07-27 | Marzia.Minosse |
| 2004-07-27 | Marky.478 |
| 2004-07-27 | Win95.MarkJ (rodzina) |
| 2004-07-27 | Mark13.782 |
| 2004-07-27 | Macro.Word.Mark |
| 2004-07-27 | Trojan.VBS.Mariquita |
| 2004-07-27 | Maripuri.1942 |
| 2004-07-27 | Mario (rodzina) |
| 2004-07-27 | Marian.700 |
| 2004-07-27 | Macro.Word.Xenixos |
| 2004-07-27 | Maresme.1062 |
| 2004-07-27 | Win95.Marburg |
| 2004-07-27 | Email-Worm.Win32.Mapson |
| 2004-07-27 | Macro.Word.Map |
| 2004-07-27 | Manzon (rodzina) |
| 2004-07-27 | Email-Worm.Win32.Manymize |
| 2004-07-27 | Manu.4096 |
| 2004-07-27 | Mantra.719 |
| 2004-07-27 | Manowar.592 |
| 2004-07-27 | Maniak |
| 2004-07-27 | Mango (rodzina) |
| 2004-07-27 | Mangel.1468 |
| 2004-07-27 | Gnutella-Worm.Mandragore |
| 2004-07-27 | Mand.1061 |