Virus signature updates cause false alarm in Windows 98

11 December 2003

Users of F-Prot Antivirus on Windows 98 systems who updated their virus signature files between 7:20 and 12:14 this morning, 11 December 2003, and who have not updated since then, may experience a false alarm where F-Prot Antivirus detects the files explorer.exe and asd.exe as the W32/Invictus virus.

Users of F-Prot Antivirus on Windows 98 systems who updated during this time period should re-update their virus signature files as soon as possible to avoid any false alarms.

If F-Prot antivirus has mistakenly detected the W32/Invictus virus on a computer running Windows 98 it will have deleted the file asd.exe. Also, if a computer has been disinfected with the F-Prot Antivirus DOS scanner it is possible that the file explorer.exe has been mistakenly deleted. To reinstate these files users should extract them from the win98_44.cab and win98_45.cab archive files on the Windows 98 CD and copy them to C:\Windows.

This problem is due to a rare fault in the signature files released this morning. This is an extremely rare occurance and FRISK Software sincerely apologises for any inconvenience this may have caused.

Please contact our support center if you are in need of any assistance.

Commtouch® is a leading developer of anti virus software and anti spam filtering services. Commtouch's anti virus computer software, F-PROT Antivirus, is available for a number of operating systems such as Windows, Linux, BSD, Solaris, and AIX as well as the Microsoft Exchange groupware.

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