This is a dangerous memory resident parasitic stealth virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed.
It also hooks INT 1, 3, 8. On June 11th and November 30th, it erases the hard drive MBR. It reboots the computer if the virus is under a debugger. It contains the following string:
MGUL. v2.5
