Deary74
04-29-2009, 05:22 AM
A logic bomb lies dormant until triggered by some event. The trigger can be a specific date, the number of times executed, a random number, or even a specific event such as deletion of an employee's payroll record. When the logic bomb is triggered, it will usually do something unpleasant. This can range from changing a random byte of data somewhere on Web Designer disk to making the entire disk unreadable. Changing random data may be the most insidious attack since it generally causes substantial damage before anyone notices that something is wrong. It's vital to have software in place that quickly detects such damage.
Like the horse, a Trojan program is a delivery vehicle; a program that does something undocumented which the programmer intended, but that the Web Designer would not approve of if he knew about it. The Trojan program appears to be a useful program of some type, but when a certain event occurs, it does something nasty and often destructive to the system. Most of the "classic" Trojan programs were delivered to Web Designer on disks which advertised themselves as something useful.
Many newer Trojan programs make their way to you as E-mail attachments. There have been many Trojan programs and new ones crop up every day. It's important to know and trust the source of any program you receive because most anti-virus programs can't detect new Trojans. These programs, while potentially destructive, still use common DOS/Windows commands and any attempt to trigger an alert on these commands would result in massive false alarms. Some anti-virus programs will include Trojans once they are circulating; but by then it may be too late for you.
A worm is a self-reproducing program that does not infect other programs as a virus will, but instead creates copies of it, and these create even more copies. Worms are usually seen on networks and on multi-processing operating systems, where the worm will create copies o fit self that are also executed. Each new copy will create more copies quickly clogging the system. These programs require a host in order to spread. Many of these are sent as a Visual Basic Script (VBS) file attached to an E-mail message. If you click on the attachment to open it the script runs and will often send the script to addresses in your E-mail address book; thus spreading itself.
Like the horse, a Trojan program is a delivery vehicle; a program that does something undocumented which the programmer intended, but that the Web Designer would not approve of if he knew about it. The Trojan program appears to be a useful program of some type, but when a certain event occurs, it does something nasty and often destructive to the system. Most of the "classic" Trojan programs were delivered to Web Designer on disks which advertised themselves as something useful.
Many newer Trojan programs make their way to you as E-mail attachments. There have been many Trojan programs and new ones crop up every day. It's important to know and trust the source of any program you receive because most anti-virus programs can't detect new Trojans. These programs, while potentially destructive, still use common DOS/Windows commands and any attempt to trigger an alert on these commands would result in massive false alarms. Some anti-virus programs will include Trojans once they are circulating; but by then it may be too late for you.
A worm is a self-reproducing program that does not infect other programs as a virus will, but instead creates copies of it, and these create even more copies. Worms are usually seen on networks and on multi-processing operating systems, where the worm will create copies o fit self that are also executed. Each new copy will create more copies quickly clogging the system. These programs require a host in order to spread. Many of these are sent as a Visual Basic Script (VBS) file attached to an E-mail message. If you click on the attachment to open it the script runs and will often send the script to addresses in your E-mail address book; thus spreading itself.