Vriest Virus

 Virus Name:  Vriest 
 V Status:    Rare 
 Discovered:  April, 1991 
 Symptoms:    .COM growth; TSR 
 Origin:      Europe 
 Eff Length:  1,280 Bytes 
 Type Code:   PRsCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, Sweep, NAV, IBMAV, ChAV, 
                    NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Vriest virus was received in April, 1991 and is believed to be 
       from somewhere in Europe.  Vriest is a memory-resident infector of 
       .COM files including COMMAND.COM. 
       The first time a program infected with Vriest is executed, Vriest 
       will become memory-resident as a low system memory TSR of 1,584 
       bytes. Interrupts 20, 21, and 27 will be hooked by the virus. 
       Unlike most virus, Vriest will not infect programs when they are 
       executed or opened.  It only infects .COM files when they are 
       copied, at which time the target file will become infected. 
       Programs infected with Vriest will increase in size by 1,280 bytes. 
       The virus will be located at the beginning of the infected file. 
       The file's date and time in the DOS disk directory will not have 
       been altered. 
       Vriest infected programs may become reinfected, adding an 
       additional 1,280 bytes to the file length.  Reinfection occurs 
       when an infected program is again copied. 
       Vriest does not appear to do anything besides replicate. 

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