Carfield Virus

 Virus Name:  Carfield 
 V Status:    Rare 
 Discovery:   1991 
 Symptoms:    .COM & .EXE growth; TSR; message 
 Eff Length:  1,508 - 1,522 Bytes 
 Type Code:   PRsA - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, NAV, AVTK, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, LProt, Innoc, NProt, IBMAV/N, 
                    AVTK/N, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Carfield virus was received from the NCSA in September, 1991. 
       Its date of discovery and original isolation point are unknown. 
       Carfield is a memory resident infector of .COM and .EXE files.  It 
       does not infect COMMAND.COM.  This virus is based on the Sunday 
       The first time a program infected with Carfield is executed, the 
       virus will install itself memory resident as a low system memory 
       TSR of 1,744 bytes.  The virus will have hooked interrupt 21. 
       Once Carfield is memory resident, it will infect .COM and .EXE 
       programs, other than COMMAND.COM, when they are executed.  Infected 
       .COM programs will increase in size by 1,508 bytes with the virus 
       being located at the beginning of the infected file.  Infected 
       .EXE programs will increase in size by 1,508 to 1,522 bytes with 
       the virus being located at the end of the infected file.  There 
       will be no change to the infected program's date and time in the 
       DOS disk directory. 
       The Carfield virus activates on Mondays.  It will hook interrupt 08 
       in addition to interrupt 21 when it becomes memory resident.  It will 
       then occassionally display the text string "Carfield!" while it is 
       memory resident. 
       See:   Sunday 

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