May saw a resurgence in the amount of viruses in circulation and the number of phishing attacks.

The latest monthly report from managed security vendor MessageLabs noted that virus attacks, and particularly Trojan attacks, increased by a third month on month, in part due to the Bagel virus.

Meanwhile phishing reached its highest level of all time, after declining since January. MessageLabs logged over nine million phishing attacks in May, over three times the number in April.