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TeamSpy Malware Returns to Steal Data

A new spam campaign emerged over the weekend, carrying the TeamSpy data-stealing malware, which can give cybercriminals full access to a compromised computer.

According to Heimdal Security, many of the victims appear to be ordinary users, but some of the victims are high-profile industrial, research or diplomatic targets.

Part of the attackers’ activities is based on misusing the legitimate TeamViewer remote access tool, including a keylogger and a TeamViewer VPN.

The current attack relies on social engineering and careless use to trick victims into installing the TeamSpy malware. The malicious technique used is DLL hijacking, which tricks a legitimate software program to perform unauthorized actions.

First, the victim receives a spam email claiming to have an “eFax” attached. When opened, the file triggers the accompanying .exe file to be activated. This causes the malicious TeamSpy code to be dropped onto the victim’s computer, as a malicious DLL.

From there, a TeamViewer session started by the attackers will be invisible to the victim. This can lead to numerous forms of abuse against the services that the logged-in user runs on his/her computer. The attack can also circumvent two-factor authentication and can also give cybercriminals access to encrypted content which is unencrypted by the users on their compromised computers.

“We highly recommend that you carefully analyze unwanted emails that you receive and that you don’t download email attachments from unknown senders,” said Andra Zaharia, security evangelist at Heimdal, in an analysis. “Malware can disguise itself in many forms on the web, and all it takes is one click to trigger an infection.”

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