Name: BPU.226 Category: Viruses Description: Details BPU.2269 This is a very dangerous memory resident partly encrypted parasitic virus. It hooks INT 9 and 21h, and writes itself to the end of COM and EXE files that are executed or closed. Depending on its counter, the virus infects the C:COMMAND.COM file. By hooking INT 9, the virus, upon any keystroke, checks INT 1. and disables the virus tracing the code. On the 22nd of any month, the virus corrupts the data that is saved on the disk. On April 22nd, the virus erases the disk sectors. On the same date starting from 1999, the virus displays: W9604 BPU