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The Basics of the Computer Virus
A Simple COM File Infector
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al,al assembly language batch file boot sec buffer computer viruses copy data area disk drive diskette ds:dx DWORD EXE file EXE header execute exit file attribute file found file handle file name file pointer FILE_OK five bytes floppy disk FNAME format hard disk hard drive head host program infect int 13H Intel Hex jump kilobytes KILROY MASM memory mov ax,WORD PTR mov BYTE PTR mov cx mov dl,al mov mov dx,OFFSET mov mov int mov mov mov mov WORD PTR MS-DOS number of bytes Number of sectors operating system original boot sector pass control PC-DOS PTR FSIZE PTR HANDLE push ax mov read the boot registers relocatable root directory SCRATCHBUF search routine sector number segment SHOULDRUN si,OFFSET stack STEALTH virus stored subdirectory system file TASM timid USEFILE viral boot sector virus code