Some Fresno State email users have received ransomware messages containing virus-laden attachments, said Technology Services.

Ransomware is a type of malware that encrypts all files accessible to the infected computer before demanding that a ransom be paid to unlock them. ­

Most of the time, these emails appear to originate from UPS and FedEx.

If a email from an unfamiliar email address appears, Technology Services said do not click on attachments or links. Opening attachments or links from unfamiliar email addresses can infect your computer system. ­

Email any suspicious messages to [email protected].