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The Basics of the Computer Virus
A Simple COM File Infector
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al,al assembly language ax mov ax,WORD PTR boot sec BOOT_START buffer bx,OFFSET call DWORD PTR computer viruses data area disk drive diskette ds:dx DWORD PTR OLD_13H EXE file EXE header execute exit file attribute file handle file name file pointer FILE_OK five bytes floppy disk FNAME format hard disk hard drive Head host program infected int 13H int 21H mov Intel Hex IO.SYS jump kilobytes KILROY let BIOS handle MASM memory mov bx,WORD PTR mov BYTE PTR mov dx,OFFSET mov int mov mov mov mov WORD PTR MS-DOS number of bytes Number of sectors operating system original boot sector PC-DOS pop ax push ax registers relocatable root directory search routine sector number segment si,OFFSET stack STEALTH virus stored subdirectory system file TASM timid timid.com track USEFILE viral boot sector virus code