F-Secure Virus Descriptions : Lehigh

The Lehigh virus is rather unusual in that it only infects one program, COMMAND.COM. It does not increase the size of the program, because it overwrites the stack space. This virus is rather badly written - it can be defeated by simply making COMMAND.COM read-only. It is, however, very destructive. "Lehigh" contains an infection counter and when it has reached a specific number of infections it will trash the disk. This means that the virus never got a chance to spread much outside Lehigh University.