CPSU-2535 Virus

 Virus Name:  CPSU-2535 
 Aliases:     Protecto-2535 
 V Status:    Rare 
 Discovery:   February, 1993 
 Symptoms:    .COM & .EXE growth; decrease in total system & available free 
 Origin:      USSR 
 Eff Length:  2,535 Bytes 
 Type Code:   PRtA - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, ViruScan, NAV, Sweep, AVTK, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The CPSU-2535 virus was submitted in February, 1993, and is from the 
       USSR.  This virus is a memory resident infector of .COM and .EXE 
       programs, but not COMMAND.COM. 
       When the first CPSU-2535 infected program is executed, the CPSU-2535 
       virus will install itself memory resident at the top of system 
       memory but below the 640K DOS boundary, moving interrupt 12's return. 
       Total system and available free memory, as indicated by the DOS 
       CHKDSK program, will have decreased by 3,088 bytes.  Interrupt 21 
       will be hooked by CPSU-2535 in memory. 
       Once the CPSU-2535 virus is memory resident, it will infect .COM and 
       .EXE programs when they are executed.  Infected programs will have a 
       file length increase of 2,535 bytes with the virus being located at 
       the end of the file.  The program's date and time in the DOS disk 
       directory listing will not be altered.  No text strings are visible 
       within the viral code in infected programs. 
       It is unknown what CPSU-2535 does besides replicate. 
       See:   Protecto 

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