Did you try looking this quest up? When posting bugs, please try and submit any research you find to go along with your bug report.
I found all types of information. First, the undead rats should only spawn at night. Their placeholders are pack rats. They always hit for 10, and should be aggressive.
Research for later:
http://eqbeastiary.allakhazam.com/search.shtml?id=4565
http://everquest.allakhazam.com/db/item.html?item=2937
http://web.archive.org/web/200304182...how&BID=151843