SSL Blacklist project exposes certificates used by malware

Researchers launch effort to track SSL certificates used in botnet and malware operations

Botnet tracking outfit Abuse.ch has launched a project to list SSL (Secure Sockets Layer) certificates used by some malware programs to hide their communications.

A large number of Web services have added support for SSL encryption over the past couple of years and the technology has increasingly been adopted by privacy-conscious users, especially following revelations of large scale surveillance and bulk data collection by intelligence agencies.

However, it's not just regular Internet users who rely on SSL to protect their communications. Some cybercriminals also use it to encrypt traffic between malware-infected computers and command-and-control servers in an attempt to bypass intrusion prevention and detection systems, the Abuse.ch maintainers said in a blog post to announce the new SSL Blacklist (SSLBL) project.

Abuse.ch has been tracking command-and-control servers for malware threats like Zeus, SpyEye, Palevo and Feodo for several years. The outfit lists the IP (Internet Protocol) addresses and domain names associated with those servers in order to help network administrators identify infected computers that attempt to communicate with them.

The new SSLBL project will serve a similar purpose, but will list digital certificates -- identified by their SHA1 cryptographic fingerprints -- that are used by botnets.

"SSLBL helps you in detecting potential botnet C&C traffic that relies on SSL," the Abuse.ch maintainers said.

So far the list https://sslbl.abuse.ch/">contains 127 certificates, including some that cybercriminals generated themselves instead of buying from a trusted certificate authority. The majority of certificates are used in the command-and-control operations of KINS, Shylock and Vawtrak, three distinct malware threats that target online banking users.

KINS is a professional banking Trojan that appeared last year; Shylock is a three-year-old threat with a focus on the U.K. that was disrupted by law enforcement agencies last week; and Vawtrak is a relatively new backdoor program with information stealing capabilities that focuses its activity on Japan.

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Lucian Constantin

IDG News Service
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