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BootExe.33 Viruses Information
| Name: |
BootExe.33 |
| Category: |
Viruses |
| Description:
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Details
BootExe.331
This is memory-resident harmless virus which hooks INT 13h and writes itself into EXE files and boot sectors of disks. The boot sector of the hard disk get infection when an infected file is started, the boot sector of floppies - during a reading from them. The original boot sector is saved on the hard disk at the location 0/0/11 (head/track/sector), on a floppy - at the location 1/0/3.
EXE files are infected in quite an original way: the virus analyzes the information read from the disk (INT 13h). If in the sector read from the disk there is an EXE file header (the first two bytes are 'MZ' and some conditions are also met) the virus writes itself into empty space in this header and saves the modified sector on the disk. It means: a) an infected file has the same length; b) no necessity to handle file attributes and time of its creation and fatal errors (INT 24h). The virus doesn't manifest itself in any observable way. |
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