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Virus.DOS.4on.1346 or 4on is a dangerous memory resident parasitic DOS virus.


When the virus is loaded into memory, it hooks INT 21h and writes itself to the end of EXE executables that are accessed.

The infection size varies in different files.

Files infected by this virus might not function properly or even cause a system crash.

Other detailsEdit

The virus contains the internal text string :


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