Day10 Virus

 Virus Name:  Day10 
 Aliases:     Day/10, SYP 
 V Status:    Rare 
 Discovered:  November, 1991 
 Symptoms:    .COM file growth; file date/time change; hard disk corruption 
 Origin:      Unknown 
 Eff Length:  674 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, AVTK/N, IBMAV/N, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Day10 virus was received in November, 1991.  Its origin is 
       unknown.  Day10 is a non-resident, direct action infector of .COM 
       programs, including COMMAND.COM.  It is destructive when it 
       When a program infected with the Day10 virus is executed, the virus 
       will infect one .COM program located in the current directory.  If 
       COMMAND.COM is located in the current directory, it may become 
       infected.  Day10 infected programs will have a file length increase 
       of 674 bytes.  The virus will belocated at the end of the infected 
       file.  The file's date and time in the DOS disk directory will also 
       have been updated to the system date and time when infection 
       occurred.  The following text string can be found within the viral 
       code in infected programs: 
       Day10 activates when an infected program is executed if the system 
       date is evenly divisible by 10 (day=10, 20, or 30).  On these days, 
       execution of an infected program will result in the Day10 virus 
       overwriting the first 80 sectors of the system hard disk. 

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