The center, founded in 2000 to receive complaints about internet crimes, received 300,000 complaints during the year from people affected by hackers’ activities.

According to the report released on Wednesday, companies lost $360 million to cybercriminals who used fake emails that appeared to be from company executives or suppliers to arrange money transfers.

IC3 announced that it received 2,673 complaints about ransomware, software that locks users’ files on their computers and forces them to pay a fee to regain access, and that losses from such software totaled more than $2.4 million.

In May, a cyberattack using such software, called WannaCry, affected 300,000 computers in more than 150 countries; it caused problems in the systems of factories, hospitals, shopping malls, and schools.