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Virus.DOS.Froll.1665 is a parasitic virus on DOS.

Behavior

When the virus is run, it infects the first uninfected DOS executable in the current directory. If there are no more files to infect in the current directory, then it would search in the parent directory for more files to infect.

The infection size varies in different files.

Payload

The virus would to change the display to video mode and display a television-like snowy screen, and produce a high-frequency tone coming from the PC speaker.

On older systems, however, it would clear the screen or cause the screen to flicker, producing the high-frequency tone.

See also

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