W97M/Chack.H is a macro virus operating in the Microsoft Word 97 environment. It attacks active documents and the global template normal.dot. It consists of two modules - CyberHack and CyberForm. The first one contains the virus code and in the second one is its activating routine. This is a variant of the virus W97M/Chack.B and it is identical with it from the viewpoint of function.