Computer Technology

STEALTH VIRUSES  

Posted by: Sanya



They viruses are stealth in nature and use various methods to hide themselves and to avoid detection. They sometimes remove themselves from the memory temporarily to avoid detection and hiding from virus scanners. Some can also redirect the disk head to read another sector instead of the sector in which they reside. Some stealth viruses like the Whale conceal the increase in the length of the infected file and display the original length by reducing the size by the same amount as that of the increase, so as to avoid detection from scanners. For example, the whale virus adds 9216 bytes to an infected file and then the virus subtracts the same number of bytes i.e. 9216 from the size given in the directory. They are somewhat difficult to detect.

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