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As is the case with many companies that maintain large databases of information, Monster is the target of illegal attempts to access and extract information from its database. We recently learned our database was illegally accessed and certain contact and account data were taken, including Monster user IDs and passwords, email addresses, names, phone numbers, and some basic demographic data. The information accessed does not include resumes. Monster does not generally collect – and the accessed information does not include – sensitive data such as social security numbers or personal financial data.

As a further precaution, we want to remind you that an email address could be used to target “phishing” emails. Monster will never send an unsolicited email asking you to confirm your username and password, nor will Monster ask you to download any software, “tool” or “access agreement” in order to use your Monster account.
[Via Monster.com]

UsaJobs.Gov is a partner with Monster.com so You should think about changing your Password.    They Also think this will be used for Phishing, if you have any doubts to the authenticity of email.  I’d suggest doing a google search on the company or name of the person who emailed you that way you can be well informaed before you do decide how you will handle it.   Also Remember most times if they ask you download software, it is probably Malware and should be scanned by your Anti-virus software.