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Pc Doctor24 Computer Help - Virus Protection Vocabulary - T

Services:

Template Time Bomb Timestamp
TOM Triggered Event Trojan Horse Program
TSR Tunneling  

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Check out the Virus Glossary for the latest virus terminology:

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Template

Certain applications use template files to pre-load default configurations settings. Microsoft Word uses a template called NORMAL.DOT to store information about page setup, margins and other document information.

Time Bomb

Usually malicious action triggered at a specific date or time. See Also: Logic Bomb

Timestamp

The time of creation or last modification recorded on a file or another object. Users can usually find the timestamp in the Properties section of a file.

TOM

Top of Memory. A design limit at the 640kb-mark on most PCs. Often the boot record does not completely reach top of memory, thus leaving empty space. Boot sector infectors often try to conceal themselves by hiding around the top of memory. Checking the top of memory value for changes can help detect a virus, though there is also non-viral reasons this value change.

Triggered Event

An action built into a virus set off by a specific condition. Examples include a message displayed on a specific date or reformatting a hard drive after the 10th execution of a program.

Trojan Horse Program

A Trojan horse program is a malicious program that pretends to be a benign application; a Trojan horse program purposefully does something the user does not expect. Trojans are not viruses since they do not replicate, but Trojan horse programs can be just as destructive.

Many people use the term to refer only to non-replicating malicious programs, thus making a distinction between Trojans and viruses. Also: Trojan

TSR

Terminate and Stay Resident. TSR programs stay in memory after being executed. TSR programs allow the user to quickly switch back and forth between programs in a non-multitasking environment, such as MS-DOS. Some viruses are TSR programs that stay in memory to infect other files and program. Also: Memory-resident Program

Tunneling

A virus technique designed to prevent anti-virus applications from working correctly. Anti-virus programs work by intercepting the operating system actions before the OS can execute a virus. Tunneling viruses try to intercept the actions before the anti-virus software can detect the malicious code. New anti-virus programs can recognize many viruses with tunneling behavior.

 

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