| Fullname: | AGI-Plan |
| Common Name: | AGI-Plan |
| Technical Name: | Month 2-4 |
| Aliases: | Month 2-4, Agiplan |
| Subtype: | COM file, destructive |
| Isolationdate: | Unknown |
| Origin: | Unknown |
| Author: | Unknown |
AGI-Plan was a memory resident DOS file infector first isolated at the Agiplan software company in Germany. Because of CARO standards that dictate that viruses should not be named after companies, AGI-Plan's technical name is Month 4–6. This name also violates CARO standards, but a more minor rule involving syntax. AGI-Plan is related to the Zero Bug virus, as both it and AGI-Plan prepend 1,536 bytes to files they infect.
AGI-Plan is not initially damaging until several months after the initial infection, hence its name. After activation, AGI-Plan will begin to corrupt write operations, which results in slow, difficult-to-notice damage over time.[1]
AGI-Plan is notable for reappearing in South Africa in what appeared to be an intentional re-release several years after. AGI-Plan never succeeded in spreading significantly beyond the isolated incidents in Germany and South Africa.