Resolve Ltd. is a Russian hosting company which appears to be involved in fraud schemes. A search on the ip address will return a lot of spammed guestbooks, mostly for pills. Apparently the spammer specialised on targetting the Advanced Guestbook script. The bot is using both random user agents and proxy servers and the referrer pointed to the domain hitairfare.com.
This robot was caught scanning with no agent which is automaticaly blocked. To prevent entry by any of its other fake agents the domain needs to be added to the domain block list.
reversedns.resolve.ru,guestbook spam and Fraud