List of computer viruses (Numeric)
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| Name | Alias(es) | Type | Subtype | Isolation Date | Isolation | Origin | Author | Notes |
| 4K | 4096 | MS-DOS |
January 1990 | unknown | The first virus to use stealth | |||
| 5lo | MS-DOS |
October 1992 | unknown | Infects .EXE files only |
