Scammers targeted Brits’ banking information with a malicious spam campaign that accounted for 0.5 percent of 3 million randomly chosen bogus messages in a matter of hours.
The e-mails hint at an alleged missed invoice and urge users to check attached files. Doing so infects users’ systems because the attachments hide a downloader of malware.
The downloader Trojan (detected by Bitdefender as Trojan.Doawnloader.JQNF) sometimes fetches a variant of the banking Trojan Zeus while other times it downloads variants of the CryptoDefense ransomware.
Zeus is often used to grab banking information via man-in-the-browser or keystrokes snatching attacks; sometimes Zeus also installs the CryptoLocker ransomware that encrypts a person’s files until a sum of money is paid. In some cases, scammers ask for as much as 1,000 dollars/euros or 1.25 bitcoins.
In the first week of March, Bitdefender Anti-Spam Lab flagged 10,000 tax-related e-mails that promised Brits money while stealing sensitive authentication or money-related data either via phishing forms or by deploying variants of the same Zeus Trojan.
As a rule of thumb, people should NEVER open attachments that come in e-mail, especially if they refer to money, invoices or payment notifications and they haven’t been explicitly requested.
Keeping the OS and the antivirus up to date will offer an extra layer of protection in such cases, by marking unsolicited bogus e-mails as spam, by clocking any phishing forms asking for sensitive data or any malicious software they gets phished in spam e-mails.
This article is based on spam samples provided courtesy of Ionut-Daniel RAILEANU, Bitdefender Anti-Spam Researcher and the technical information provided by Doina Cosovan, Bitdefender Virus Analyst.