Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Sleepwalker

Sleepwalker is a resident COM infector. The virus redirects the service of the interrupts INT 21h and INT 1Ch to its code. Files are attacked when they are executed and the virus checks their length. If the file is longer than 64000 bytes or shorter than 16 bytes no infection takes place. The virus checks the year saved in CMOS memory. If it is higher than 1994 the virus avoids files SCAN*.*, NAV*.*, VSHIELD*.* and CLEA*.*. The result of the virus activity is harmless but rather unpleasant. It tests the key CAPS LOCK and if it is not on the virus stimulates its switching on. In the virus body there is the following text string:

Sleepwalker. (c) OPTUS 1993.

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