About 68% of global email traffic comprised of unsolicited emails during August 2013, a 3.2% points fall compared to last month, according to a report from Kaspersky Lab.
The rate of phishing messages in August grew more than 10 times compared to July 2013, while the volume of spam messages containing malicious attachments increased 2.5 times, accounting for 5.6% of all email traffic.
The security firm put the decrease down to the vacation season.
Kaspersky Lab senior spam analyst Tatyana Shcherbakova said spam becomes much more dangerous in summer.
"The number of scam messages increases and so does the number of messages containing malicious attachments," Shcherbakova said.
During August, cybercriminals sent fake messages on non-existent airline and hotel reservations including some of the biggest names in the industry.
Spammers usually prompt the user to open a malicious attachment or follow a link which initiates a file download to the hard drive.
According to the report, the majority of phishing attacks were targeted towards social networks, while the security firm has detected spam messages from an official Apple address, which asks users to confirm their iTunes account details by following a link.
China continued to be first in the list of spam generating countries followed by the US and South Korea, while all the three countries accounted for over half of all global spam.
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