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Virus.DOS.Blink.501 is a memory resident parasitic DOS virus.

Behavior

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. 

Memory usage

The exact memory usage is 1,024 bytes.

Payload

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. 

Videos

Virus.DOS.Blink01:04

Virus.DOS.Blink.501

Virus.DOS.Blink.501 on Virtual PC

Blink01:06

Blink.exe DOS Virus

Blink on Standalone PC

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