Thanks for the help; the general consensus appears to be that WBM means web based management, and 0.0.0.0 means the request did not come from outside my home. I was making a number of changes at the time. I was converting a number of TiVo devices form wireless G adapters to MOCA adapters. The MOCA adapters for TiVo devices are cheaper than the wireless N adapters.
I also note that the security log notes that the MI424WR (Rev. I) router was activated in 2007; I didn't get the router until January 2012 and it appears new.