This is a dangerous memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of COM files that are executed. It deletes MSAV.* files. It contains the internal text strings:
MSAV Eli & Yuval were here and killed the Lehigh !!! The Anti-MicroSoft Virus (AMSV) v1.0 By Yuval Sherman & Eli Shapira.... Revenge against Microsoft.