Small-145 Virus

 Virus Name:  Small-145 
 V Status:    Rare 
 Discovered:  June, 1993 
 Symptoms:    .COM file growth; file date/time changes 
 Origin:      Unknown 
 Eff Length:  145 Bytes 
 Type Code:   PRxCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, IBMAV, AVTK, F-Prot, Sweep, NAVDX, PCScan, 
                    NAV, VAlert, ChAV, 
                    LProt, Sweep/N, NShld, NProt, AVTK/N, NAV/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Small-145 virus was submitted in June, 1993, its origin is 
       unknown.  Small-145 is a memory resident infector of .COM programs 
       including COMMAND.COM. 
       When the first Small-145 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-145 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 145 bytes with the 
       virus being located at the beginning 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-145 
       infected programs. 
       Small-145 doesn't do anything besides replicate. 

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