When the virus is loaded into memory, it hooks INT 1Ch, 21h and 65h, writes itself at the end of any DOS executable that is run. INT 65h is used on virus installation.
This is an ID-interrupt of TSR copy of the virus.
The exact memory usage is 1,024 bytes.
After the 4th infection the virus manifests itself by a video effect, it blinks the screen. The user cannot stop it with any command other than resetting the system.