Small-178 Virus

 Virus Name:  Small-178 
 V Status:    Rare 
 Discovered:  February, 1993 
 Symptoms:    .COM program growth; file date/time changes 
 Origin:      USSR 
 Eff Length:  178 Bytes 
 Type Code:   PRxCK - Parasitic Resident .COM Infector 
 Detection Method:  Sweep, AVTK, F-Prot, ViruScan, IBMAV, PCScan, 
                    NAV, NAVDX, VAlert, ChAV, 
                    Sweep/N, NShld, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Small-178 virus was submitted in February, 1993, and is from the 
       USSR.  Small-178 is a memory resident infector of .COM programs 
       including COMMAND.COM. 
       When the first Small-178 infected program is executed, this virus 
       will install itself memory resident in a "hole" in low allocated 
       system memory, hooking interrupt 21.  Total system and available free 
       memory, as indicated by the DOS CHKDSK program, will not be altered. 
       Once the Small-178 virus is memory resident, it will infect .COM 
       programs, including COMMAND.COM, when they are executed.  Infected 
       programs will have a file length increase of 178 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 have been updated to the 
       current system date and time when infection occurred.  No text 
       strings are visible within the viral code in Small-178 infected 
       Small-178 doesn't do anything besides replicate. 

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