Antipode Virus

 Virus Name:  Antipode 
 Aliases:     Antipode.802 
 V Status:    New 
 Discovery:   April, 1995 
 Symptoms:    .COM file growth; .EXE file size decrease; system hangs; 
              decrease in available free memory; 
              file date/time seconds = "02" 
 Origin:      Australia 
 Eff Length:  802 Bytes 
 Type Code:   PRhC - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, NAV, AVTK, Sweep, NAVDX, VAlert, ViruScan, 
                    IBMAV, PCScan, ChAV, 
                    Sweep/N, NShld, NAV/N, AVTK/N, IBMAV/N, NProt, 
                    Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Antipode virus was received from Australia in April, 1995.  This 
       virus is a memory resident stealth virus which infects .COM files, 
       but not COMMAND.COM. 
       When the first Antipode infected program is executed, this virus will 
       install itself memory resident at the top of system memory but below 
       the 640K DOS boundary.  Total available free memory, as indicated by 
       the DOS 5.0 CHKDSK program, will have decreased by approximately 
       1,632 bytes.  Interrupt 21 will be hooked by the virus in memory. 
       Once the Antipode virus is memory resident, it will infect .COM 
       files, but not COMMAND.COM, when they are executed or opened. 
       Infected programs will have a file length increase of 802 bytes, 
       though this file length increase will not be visible in a DOS disk 
       directory listing when the virus is memory resident.  The virus will 
       be located at the end of the file.  The file's date and time in the 
       DOS disk directory listing will not appear to be altered, though the 
       seconds field will have been set to "02".  The folowing text string 
       is encrypted within the viral code: 
               "COMcomTBSCAN.EXE[Antipode 1.0] by Automag/VLAD" 
       While the Antipode virus is memory resident, the file length for 
       some .EXE programs will appear to have decreased by 802 bytes in a 
       DOS disk directory listing while others will show the correct file 
       length.  System hangs may occur when the system user attempts to 
       copy infected files. 

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