Under 7 Virus

 Virus Name:  Under 7 
 Aliases:     Paradise 
 V Status:    New 
 Discovered:  June, 1993 
 Symptoms:    .COM file growth; file date/time changes; system hangs 
 Origin:      Unknown 
 Eff Length:  320 Bytes 
 Type Code:   PRaCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, AVTK, Sweep, NAV, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, AVTK/N, NProt, IBMAV/N, Innoc, NAV/N 
 Removal Instructions:  Delete infected Files 
 General Comments: 
       The Under 7 virus was received in June, 1993.  Under 7 is a memory 
       resident infector of .COM programs, including COMMAND.COM. 
       When the first Under 7 infected program is executed, this virus will 
       install itself memory resident in low available free memory, hooking 
       interrupt 21.  It will also access the system hard disk at this time, 
       and a system hang may occur. 
       Once the Under 7 virus is memory resident, it will infect .COM 
       programs when they are executed.  Infected programs will have a file 
       length increase of 320 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.  One text string can be found at the end of 
       the viral code in all Under 7 infected programs: 

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