Fourcourse is a Visual Basic Script trojan which consists of two VBS files. The first file carries another Visual Basic Script which it drops in the root of C: drive as sysw32.vbs.
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.
It also changes Windows registry by adding the following key:
So the next time the system is restarted, the trojan in sysw32.vbs is executed.If the system date is after April 1st, 2003 the script code in sysw32.vbs tries to use all four COM ports to dial a phone number.
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