Kaspersky’s Spam in 2013 report has found China and the US have remained as the top sources of spam.
The report reveals that the countries made up 40.6 per cent of the world’s spam.
China and the US came first and second in the spam distribution rating, matching their positions in lists of countries ranked by number of internet users.
South Korea moved up to third, seeing its percentage share increase 3.5 times compared with the previous year.
The report also found that the percentage of emails with malicious attachments were 0.2 per lower cent than in 2012. It also found that 32.1 per cent of phishing attacks targeted social networks in 2013.