For more information on macro viruses, see the description of WordMacro/Concept.
The Safwan virus consist of one encrypted AutoOpen macro. When the virus infects NORMAL.DOT, it splits to macros named FileOpen and System32.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
WordMacro/Safwan activates on the 10th of October. At this time it displays a dialog box with this text:
Happy Birthday Is it your birthday today? Yes No
If the answer is yes the virus does not infect the opened document.
Otherwise the virus only spreads. The name of the virus comes from a text macro it created to check if it has already infected NORMAL.DOT.
Safwan was reported to be in the wild in summer 1997.
Description Created: Mikko Hypponen, F-Secure