Virus.DOS.Deliver.BlueShark.1771 or BlueShark is a virus that runs on MS-DOS.
BlueShark is a dangerous memory resident encrypted parasitic virus. It hooks on INT 21h and writes itself at the end of .exe-files that are activatd. On November 1st it overwrites the hard drive sectors with the strings:
! MAYBE ONE DAY WE BE UNITED !
then it plays the tune (Star Spangled Banner), displays the US national flag and the message:
!!! MY NAME IS DISKDELIVER * THIS IS ONLY BEGIN * I BE BACK !!!
It also contains the internal string:
""" CREATED BY BLUE SHARK - FINISHED 7.VIII.1994 15:30 - CIESZYN POLAND """
After restarting, the virus wipes the hard drive.