WM/Wazzu is an insidiously damaging Word macro virus. Technically it is a very simple virus, spreading in the manner common to most Word macro viruses.

The virus payload triggers every time a document is infected and between one and three words in the document are randomly moved to another location.

Additionally, the word "wazzu" may be inserted into the document at a random location.

WM/Wazzu is particularly damaging because there can be no automated way of undoing the effects of the payload. The word "wazzu" can be searched for and removed, but only careful manual checking can find and fix the moved words.