Threat Encyclopaedia
| Threat Name | Description Type | Threat Type | Date Added |
| Win32/Zaka.L | Threat Variant | worm | 2002-09-16 |
| Win32/Zaka.N | Threat Variant | worm | 2002-12-11 |
| Win32/Zayan.A | Threat Variant | trojan | 2003-11-28 |
| Win32/Zalup.AA | Threat Variant | trojan | 2008-06-16 |
| Win32/Zalup.AT | Threat Variant | trojan | 2009-09-29 |
| Win32/Zonebac.AA | Threat Variant | trojan | 2010-01-05 |
| Win32/Zimuse.A | Threat Variant | worm | 2010-01-08 |
| Win32/Zimuse.B | Threat Variant | worm | 2010-01-13 |
| MSIL/Zamog.A | Threat Variant | worm | 2010-04-20 |
| Win32/Zehbilas.A | Threat Variant | worm | 2010-12-03 |