Sleepwalker stays resident in memory and infects all executed or opened COM files. It marks infected files by setting their time stamp to 10:47 (time field is not visible with normal DOS DIR command).
Sleepwalker contains the following text:
Sleepwalker. (C) OPTUS 1993.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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