Anto Virus

 Virus Name:  Anto 
 V Status:    Rare 
 Discovery:   January, 1992 
 Symptoms:    .COM file growth; file date/time changes; system hangs; 
              boot failure; Divide overflow errors 
 Origin:      Unknown 
 Eff Length:  129 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  Sweep, ViruScan, F-Prot, AVTK, NAV, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Anto Virus was submitted in January, 1992.  Its origin, or point 
       of isolation, are unknown.  Anto is a non-resident, direct action 
       infector of .COM programs, including COMMAND.COM. 
       When a program infected with the Anto virus is executed, the Anto 
       virus will infect all .COM programs located in the current directory. 
       If COMMAND.COM is located in this directory, it will be infected. 
       This virus cannot recognize when programs have been previously 
       infected by the virus, so they will be reinfected if previously 
       Programs infected with the Anto virus will have a file length 
       increase of 129 bytes with each infection of the Anto virus present 
       on the host file.  The virus will be located at the beginning of 
       the infected file, and in the case of reinfected files, will also 
       be found at the end of the file.  The program's date and time in the 
       DOS disk directory listing will have been altered to the current 
       system date and time when the last infection occurred. 
       Systems infected with the Anto virus may notice frequent system 
       hangs or "Divide overflow" errors when infected programs are 
       executed.  Attempts to boot from an infected copy of COMMAND.COM 
       will also result in a system hang with the message "Cannot start 
       COMMAND, exiting". 

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