Cybercriminals are using the Tor network to control their botnets - bonetond1972

Malware writers are increasingly considering the Tor anonymity electronic network arsenic an option for hiding the real placement of their command-and-control (C&C) servers, according to researchers from protection firm ESET.

The ESET researchers freshly came across two botnet-type malware programs that use (C&C) servers operative as Tor "secret services."

The Tor Hidden Table service communications protocol allows users to readiness up services—usually Net servers—that fire only exist accessed from within the Tor network done a random-looking hostname that ends in the .onion pseudo domain extension.

This communications protocol was designed to conceal the tangible Internet Protocol (IP) address of a "hidden service" from its clients as well every bit hide the clients' IP addresses from the service, making it almost impossible for either party to determine the separate's location or identity operator.

The traffic between a Tor client and a Tor hidden service is encrypted and is randomly routed through a series of computers participating in the network and acting as relays.

Predictions now coming true

Using Tor to host botnet command-and-control (C&C) servers is not a sunrise idea. The strengths and weaknesses of such an approach were discussed in a presentation at the DefCon 18 security group discussion in 2010.

Operable implementations of this concept have also been seen in the past. In December, researchers from security firm Rapid7 known the Skynet botnet of 12,000 to 15,000 compromised computers that were receiving commands from an Internet Relay Chat (IRC) server flying As a Tor hidden service. The researchers warned at the time that other malware writers were likely to adopt the pattern.

Two virgin malware programs disclosed away ESET newly suggest that their prediction was right.

"In July ESET researchers detected two different types of TOR-supported botnets based on the malware families Win32/Atrax and Win32/Agent.PTA," ESET malware researchers Anton Cherepanov and Aleksandr Matrosov same Wednesday in a blog post. "Some botnets own descriptor-grabbing functionality for possible further fraud operations."

Dissimilar Skynet, the Atrax and Agent.PTA botnets employment Web, not IRC, servers hidden on the Tor net for command and control purposes.

Atrax can download, execute and come in malicious files into browser processes. Its functionality can be extended through plug-Immigration and Naturalization Service that are encrypted locally with an AES key generated from the hardware parameters of each infected computer.

Atrax comes with a Tor client component that gets injected into the local browser ready to route the malware's C&C traffic complete the Tor network.

The ESET researchers were able to trick the Atrax C&C server into sending two additional plug-ins to a test system of rules infected with the malware. One of them was designed to steal selective information entered into Web forms and the other was capable of theft passwords.

The other menace known in July, known as Agent.PTA, is part of a malware family known since 2012, the ESET researchers said. However, the Tor functionality is a new addition to that, they said.

Like Atrax, Agent.PTA has form-grabbing capabilities and its functionality can too be extended through plug-ins. The malware connects to Web control servers operated as Tor invisible services.

"This year we had already noticed TOR-based botnets but during the summertime we undergo observed a emergence in the numbers of malware families starting to use up TOR-based communications," the ESET researchers said. "The TOR-based botnets make it really hard to pursue probe and C&C location tracking."

However, even if locating the serious IP addresses of the C&C servers is effortful when they are only accessible from inside the Tor network, analyzing the malware's communication protocols and require and control traffic is still doable, the researchers said.

Source: https://www.pcworld.com/article/453061/cybercriminals-increasingly-use-the-tor-network-to-control-their-botnets-researchers-say.html

Posted by: bonetond1972.blogspot.com

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