V483 Virus

 Virus Name:  V483 
 V Status:    Rare 
 Discovered:  August, 1991 
 Symptoms:    .COM & .EXE growth; system hangs; file date/time changes 
 Origin:      Unknown 
 Eff Length:  483 Bytes 
 Type Code:   PRAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  [Not in Certification Set] 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The V483 virus was received in August, 1991.  Its origin is 
       unknown.  V483 is a memory resident infector of .COM and .EXE 
       programs, including COMMAND.COM. 
       When a program infected with V483 is executed, this virus will 
       install itself memory resident.  After becoming memory resident, 
       it will infect the next .COM or .EXE program which is executed. 
       If COMMAND.COM is executed, it will become infected.  At this 
       time, the system will become hung once the virus has completed 
       infecting the program the user was attempting to execute. 
       Programs infected with V483 will have a file length increase of 
       483 bytes.  The virus will be located at the end of the infected 
       program.  The file's date and time in the DOS disk directory will 
       also have been updated to the system date and time when infection 
       occurred.  V483 will also overwrite the first 24 bytes of infected 
       files with hex "FF" characters, thus permanently corrupting them. 
       Infected programs will usually not execute properly. 

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