| 2004-07-27 | Ziuck (rodzina) |
| 2004-07-27 | Email-Worm.Win32.Zircon.c |
| 2004-07-27 | Linux.Zipworm |
| 2004-07-27 | Email-Worm.Win32.ZippedFiles |
| 2004-07-27 | Win95.ZHymn |
| 2004-07-27 | Zhu.1743 |
| 2004-07-27 | Zhitomir.1654 |
| 2004-07-27 | Zhangfan.1535 |
| 2004-07-27 | Zeus |
| 2004-07-27 | ZeroDivide.604 |
| 2004-07-27 | Zero2o |
| 2004-07-27 | Macro.Word.Zero |
| 2004-07-27 | Win95.Zerg |
| 2004-07-27 | Zelentsov.379 |
| 2004-07-27 | Macro.Word97.Zeitung.d |
| 2004-07-27 | Zed.287 |
| 2004-07-27 | Macro.Word.Zashib |
| 2004-07-27 | Zarina.509 |
| 2004-07-27 | Zamoy.587 |
| 2004-07-27 | Zahak.906 |
| 2004-07-27 | Email-Worm.Win32.Zafi.b |
| 2004-07-27 | Email-Worm.Win32.Zafi.a |
| 2004-07-27 | ZW.1967 |
| 2004-07-27 | ZGB.2112 |
| 2004-07-27 | Macro.Word97.Zmk |
| 2004-07-27 | Win95.Yurn |
| 2004-07-27 | Win95.Yoyo |
| 2004-07-27 | Win32.Younga |
| 2004-07-27 | Win95.Youd |
| 2004-07-27 | YouHaveProblem.577 |
| 2004-07-27 | YouAreIll.1186 |
| 2004-07-27 | zMacro.Excel.Yohimbe |
| 2004-07-27 | Yog.794 |
| 2004-07-27 | Win95.Yobe |
| 2004-07-27 | Win95.Ylang |
| 2004-07-27 | Trojan.Spy.Yitai |