If that change is linked to the summer vacation season, then it was the most innocuous spammers that left town: the rate of phishing messages rose more than 10 times compared to July, while the volume of spam messages containing malicious attachments rose 2.5 times, accounting for 5.6% of all email traffic.
The vacation season may have been winding down, but cybercriminals kept up a continuous bombardment of fake messages announcing non-existent airline and hotel reservations, with the spammers using some of the biggest names in these industries.
The fact that such messages often look genuine can relax the recipient's vigilance. They usually prompt the user to open a malicious attachment or follow a link that initiates a file download to the hard drive. In either case, the victim computer is infected with the Tepfer Trojan that steals user credentials.
August also saw a tenfold increase in the proportion of phishing messages. Kaspersky Lab reported mass mailings that appeared to come from an official Apple address that asked recipients to con-firm their iTunes account details by following a link. The favourite target of phishing attacks, however, remains social networks.
The names of popular international delivery services also appear frequently in spam messages. These emails inform potential victims that a parcel cannot be delivered to them for some reason and that in order to collect it they have to print out the file attached to the message and then visit the company's office or confirm specific data. In some cases the attached files supposedly contain information about the non-existent parcels.
Spammers try to make these messages look as genuine as possible, using seemingly legitimate email addresses, providing detailed information about the order, genuine contact data from official sites and copying the relevant confidentiality notifications.
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