Sol Virus

 Virus Name:  Sol 
 Aliases:     Sol.545 
 V Status:    New 
 Discovered:  January,1996 
 Symptoms:    .COM file growth; file date/time seconds = "60" or "62"; 
              decrease in available free memory; boot failures 
 Origin:      Unknown 
 Eff Length:  545 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  IBMAV, ViruScan, AVTK, NAV, NAVDX, F-Prot, ChAV, 
                    IBMAV/N, NShld, AVTK/N, NAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Sol or Sol.545 virus was received in January, 1996, along with 
       one variant, Sol.557.  Sol is a memory resident infector of .COM 
       files, including COMMAND.COM. 
       When the first Sol infected program is executed, this virus will 
       install itself memory resident at the top of system memory but below 
       the 640K DOS boundary, not moving interrupt 12's return.  Available 
       free memory, as indicated by the DOS CHKDSK program from DOS 5.0, 
       will have decreased by 1,040 bytes.  Interrupts 21, 24, and 27 will 
       be hooked by the virus in memory. 
       Once the Sol virus is memory resident, it will infect .COM files 
       when they are executed.  Infected programs will have a file length 
       increase of 545 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 not appear to be altered, though the seconds field will have 
       been set to "60" or "62".  No text strings are visible within the 
       viral code. 
       Systems infected with the Sol virus will fail to boot once the 
       boot copy of COMMAND.COM becomes infected. 
       Known variant(s) of Sol are: 
       Sol.557: Also received in January, 1996, this is a 557 byte 
           variant of the Sol virus described above.  It adds 557 bytes 
           to the .COM files it infects, including COMMAND.COM.  The 
           virus will be located at the end of the file, and the seconds 
           field in the file's date and time in the DOS disk directory 
           listing will have been set to "60" or "62". 
           Origin:  Unknown  January, 1996. 

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