Locked Banking Trojan Escelar Infects Thousands In Brazil and the US

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Unit 42 for the past three months has been tracking a banking Trojan targeting victims in Brazil and the United States. Escelar originally surfaced in January of this year, and has since had roughly 100,000 instances of attempted infections.

 

Attackers deliver the Trojan using generic Portuguese language phishing emails and are currently targeting seven Brazilian banks. Once delivered, Escelar has multiple installation stages where malware is downloaded using direct connections to multiple Microsoft SQL servers. These SQL servers are also used for command and control (C2) functionality.

 

The most recently discovered Microsoft SQL server being used as Escalar infrastructure contained records of 1660 infections that all connected in a two-day time frame.

The malware is able to control banking transactions conducted using Internet Explorer, and harvest email credentials, which are in turn used to spread the malware further.

 

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