A Trojan horse, with a descriptive name Infostealer.Monstres, was used to steal more than 1.6 million records from several hundred thousand people who posted resumes on Monster.com, Symantec has reported.

The personal details of hundreds of thousands of candidates, such as name, surname, email address, country, home address, work/mobile/home phone numbers and resume ID etc. were stolen and then uploaded to a remote server under the control of the attackers.

The trojan targeted hiring.monster.com and recruiter.monster.com subdomains; subdomains which belong to the “Monster for employers” only site, the section which is used by recruiters and human resources personnel to search for potential candidates, post jobs to Monster, et cetera. This site requires recruiters to log in to view information on candidates. Several recruiters information, probably stolen, was used to access the site and collect the information.

Such a large database of highly personal information is any spammer’s dream. Symantec found that the Trojan can be instructed to send spam email using a mail template downloadable from the command & control server. Source: Symantec

I would strongly advise you to remove your resume from Monster.com and even delete the account if possible, until the problem has been fully resolved. Also verify any emails supposedly from monster.com because you can expect lots of phishing attempts based on this data.