Feist Virus

 Virus Name:  Feist 
 V Status:    Rare 
 Discovered:  January, 1992 
 Symptoms:    .COM & .EXE growth; file date/time changes; unexpected error 
 Origin:      Unknown 
 Eff Length:  670 Bytes 
 Type Code:   PRfAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  Sweep, ViruScan, F-Prot, AVTK, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Feist virus was received in January, 1992.  Its origin or 
       point of original isolation is unknown.  Feist is a memory resident 
       infector of .COM and .EXE programs, including COMMAND.COM. 
       The first time a program infected with the Feist virus is executed, 
       this virus will install itself memory resident in free available 
       memory.  As such, there will be no change to total system and 
       available free memory.  Interrupt 21 will be hooked by the virus. 
       Once the Feist virus is memory resident, it will infect .COM and 
       .EXE programs when they are executed.  Infected programs will have 
       a file length increase of 670 bytes with the virus being located 
       at the end of the infected file.  The program's date and time in 
       the DOS disk directory will have been updated to the current system 
       date and time.  The following text string can be found within the 
       viral code in all Feist infected programs: 
       Systems infected with the Feist virus may experience unexpected 
       errors when attempting to execute programs.  These errors include, 
       but are not limited to, divide overflow errors and data errors 
       reading or writing to the current drive. 

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