I was reading http://about-threats.trendmicro.com/malware.aspx?language=au&name=BAT_VOBFUS.SM earlier today after it turned up in a scan of a friends PC. I suppose I may be missing something vital here, but from everything I can tell the "malware" seems to do nothing but remove another piece of malware. It even removes itself if the other malware isn't there!
Has some important info been pruned from the trend micro page in the interests of not sharing exploits that might make this make more sense, or is this normal for a piece of malware? Perhaps this is an analogue of graffiti artists removing another artists tags from something (the image of rogue, vigilante malware removing other malware is somewhat amusing to me, but I kind of doubt this is it).