Voronezh-Chemist Virus

 Virus Name:  Voronezh-Chemist 
 Aliases:     Chemist, Video Mode, Voronezh-650 
 V Status:    Rare 
 Discovered:  January, 1992 
 Symptoms:    .COM file growth; decrease in total system & available free 
 Origin:      Unknown 
 Eff Length:  650 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  Sweep, ViruScan, F-Prot, AVTK, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Voronezh-Chemist, or Chemist, virus was submitted in January, 
       1992.  Its origin is unknown, though it is related to the Voronezh 
       and Voronezh-370 viruses.  Voronezh-Chemist is a memory resident 
       infector of .COM programs, including COMMAND.COM. 
       The first time a program infected with the Voronezh-Chemist virus 
       is executed, this virus will install itself memory resident at the 
       top of system memory but below the 640K DOS boundary.  Total system 
       and available free memory will have decreased by 2,048 bytes. 
       Interrupt 12's return will not have been moved.  Interrupts 21 and 
       24 will be hooked by the virus. 
       Once Voronezh-Chemist is memory resident, it will infect .COM 
       programs when they are executed.  Infected programs will have a 
       file length increase of 650 bytes with the virus being located at 
       the beginning of the infected file.  The file's date and time in 
       the DOS disk directory listing will not have been altered. 
       The following text strings can be found within the viral code in 
       all Voronezh-Chemist infected programs: 
               "Video mode 80x25 not supported" 
               "16.01.91, v1.00" 
       It is unknown if Voronezh-Chemist does anything besides replicate. 
       Known variant(s) of Voronezh-Chemist are: 
       Voronezh-650: Functionally similar to the Voronezh-Chemist 
                 virus described above, this variant has three bytes which 
                 Origin:  USSR  December, 1992. 
       See:   Voronezh   Voronezh-370 

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