Charm Virus

 Virus Name:  Charm 
 V Status:    New 
 Discovery:   July, 1995 
 Symptoms:    .COM file growth; file date/time changes 
 Origin:      Unknown 
 Eff Length:  501 - 508 Bytes 
 Type Code:   PRaCK - Parasitic Resident .COM Infector 
 Detection Method: F-Prot, AVTK, VAlert, NAV, NAVDX, ViruScan, Sweep, 
                   IBMAV, ChAV, 
                   NShld, NAV/N, Sweep/N, AVTK/N, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Charm virus was received in July, 1995.  Its origin or point of 
       isolation is unknown.  Charm is a memory resident infector of .COM 
       files, including COMMAND.COM.  It does not infect very small .COM 
       When the first Charm infected program is executed, this virus will 
       install itself in allocated system memory, hooking interrupt 21. 
       Total system and available free memory, as indicated by the DOS 
       CHKDSK program, will not be altered. 
       Once the Charm virus is memory resident, it will infect .COM files 
       when they are executed.  Programs infected with the Charm virus 
       will have a file length increase of 501 to 508 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.  No text 
       strings are visible within the viral code. 
       It is unknown what the Charm virus may do besides replicate. 

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