Attackers remained busy in May as they developed and issued 44.5 million new versions of cyber threats, researchers said.
The 44.5 million figure is a new high for this year and it represents a hike of over 50 percent over the previous month, when the company’s system recorded 29.2 million new threats, said researchers at Symantec.
The time interval with the second largest number of malicious software seen by Symantec systems is March, with an amount reaching 35.8 million samples.
Since the beginning of the year, the months with the lowest activity as far as new malware goes is February, with 26.5 million, and April.
According to data from the company, the most commonly seen threat on OS X is a Trojan called OSX.RSPlug.A, which changes the DNS (domain name system) settings of the affected computer, driving traffic to sites controlled by the attacker. The detection frequency increased to 23.9 percent in May, up by 4 percent.
Following in, the top most commonly seen and driven off from the OS X environment is Keylogger, with 14 percent and Wirelurker, accounting for 9 percent.
The report from Symantec said the number of spear-phishing attacks seen on a daily basis recorded a downward trend.
Attacks using this tactic focused more on organizations with less than 250 employees, with 42.5 percent aimed at the small guys. That represents an increase from 30.6 percent in April.
The type of files seen attached in most malicious emails is DOC and DOCX, associated with Windows Word documents. These accounted for 40 percent of the total.