Summary

XF/Sic is a simple Excel formula virus. It spreads when Excel documents are opened.

The virus contains these texts:

        Classic.Poppy by VicodinES
        With Lord Natas
        An Excel Formula Macro Virus (XF.Classic)
        Hydrocodone/APAP 10-650 For Your Computer
        (C) The Narkotic Network 1998

Additional Details

The virus activates at 06:30 and 18:30, if an infected sheet is open. On 06:30, it displays this text in the status row of Excel:

        VicodinES and Lord Natas greet you a good morning!

At the same time, the title of Excel is changed from "Microsoft Excel" to "XF.Classic.Poppy".

At 18:30, it displays two dialog boxes, with these texts:

        XF.Classic.Poppy by VicodinES

        (c) 1998 The Narkotic Network

The virus assign it's macro to the user sheets.This can cause sometimes an error message when Excel open/close already disinfected files.

[Analysis: Mikko Hypponen & Katrin Tocheva]