| 2004-07-27 | Yelet.2098 |
| 2004-07-27 | Yeke (rodzina) |
| 2004-07-27 | Yanush (rodzina) |
| 2004-07-27 | Yang.2528 |
| 2004-07-27 | YanShort (rodzina) |
| 2004-07-27 | YIL.1363 |
| 2004-07-27 | YCTC (rodzina) |
| 2004-07-27 | YB (rodzina) |
| 2004-07-27 | Xtac.1564 |
| 2004-07-27 | Xph (rodzina) |
| 2004-07-27 | Xandu.2385 |
| 2004-07-27 | Xak.3132 |
| 2004-07-27 | Xabaras.1972 |
| 2004-07-27 | XM (rodzina) |
| 2004-07-27 | XIV.2248 |
| 2004-07-27 | XIV |
| 2004-07-27 | XEP.1355 |
| 2004-07-27 | XCat.1365 |
| 2004-07-27 | X-Ray.2050 |
| 2004-07-27 | X-Mrei (rodzina) |
| 2004-07-27 | Wuhan.3289 |
| 2004-07-27 | Wsurc.1630 |
| 2004-07-27 | WpcBats (rodzina) |
| 2004-07-27 | Woytek.1656 |
| 2004-07-27 | Wormsign.1710 |
| 2004-07-27 | WorkHard.1664 |
| 2004-07-27 | Word (rodzina) |
| 2004-07-27 | WoodGoblin.2413 |
| 2004-07-27 | Wolleh |
| 2004-07-27 | Witch (rodzina) |
| 2004-07-27 | Wirusek.2723 |
| 2004-07-27 | Backdoor.Winshell.30 |
| 2004-07-27 | Trojan.PSW.Winrep32 |
| 2004-07-27 | Win9x.Frone |
| 2004-07-27 | WilliWonka.1088 |
| 2004-07-27 | Wilbur (rodzina) |