337 Virus

 Virus Name:  337 
 Aliases:     F1-337, V337 
 V Status:    Rare 
 Discovery:   May, 1991 
 Symptoms:    .COM file growth; TSR 
 Origin:      Europe 
 Eff Length:  337 Bytes 
 Type Code:   PRsC - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, AVTK, Sweep, NAV, NAVDX, 
                    IBMAV, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, LProt, Innoc, NProt, AVTK/N, NAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 337 virus was received from Europe in May, 1991.  337 is a 
       memory resident infector of .COM programs.  It does not infect 
       The first time a program infected with 337 is executed, the virus 
       will install itself memory resident as a low system memory TSR of 
       944 bytes.  Interrupt 21 will be hooked by the virus. 
       Once 337 is memory resident, it will infect .COM programs, other 
       than COMMAND.COM, when they are opened or executed.  Programs 
       infected with 337 will increase in length by 337 bytes with the 
       virus being located at the end of infected files.  The program's 
       date and time in the disk directory will not be altered. 
       337 does not do anything besides replicate. 

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