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Cybercrime | News


A PROXYJACKING CAMPAIGN IS LOOKING FOR VULNERABLE SSH SERVERS

Posted: June 30, 2023 by Pieter Arntz

Proxyjacking is a cybercrime where your bandwidth is sold by criminals.

A researcher at Akamai has posted a blog about a worrying new
trend—proxyjacking—where criminals sell your bandwidth to a third-party proxy
service.

To understand how proxyjacking works, we’ll need to explain a few things.

There are several legitimate services that pay users to share their surplus
Internet bandwidth, such as Peer2Profit and HoneyGain. The participants install
software that adds their systems to the proxy-network of the service. Customers
of the proxy service have their traffic routed through the participants'
systems.

The foundation of the proxyjacking problem lies in the fact that these services
don’t check where the shared bandwidth is coming from. Peer2Profit and Honeygain
claim to only share their proxies with theoretically vetted partners, but
according to Akamai's research they don’t check if the one offering the
bandwidth is the actual owner.

Proxies and stolen bandwidth have always been popular among cybercriminals since
they allow them to anonymize their traffic. What’s new about this campaign is
that these same criminals are now “renting out” the bandwidth of compromised
systems to make money instead of simply using them.

The researcher became aware of the campaign when they noticed an attacker
establishing multiple SSH (Secure Shell) connections to one of their Cowrie
honeypots. Cowrie is a medium to high interaction SSH and Telnet honeypot
designed to log brute force attacks and the shell interaction performed by the
attacker. It can be used to emulate a UNIX system in Python, or to function as
an SSH and telnet proxy to observe attacker behavior to another system.

For the criminals the beauty of the attack is that it is mostly fileless and the
files that are actually used, curl and the public Docker images for the proxy
monetization services Peer2Profit and Honeygain, are legitimate and will not be
detected by anti-malware solutions.

And proxyjacking is a lot less likely to be detected than cryptojacking since it
requires only minimal CPU cycles and uses surplus Internet bandwidth.
Interesting to note, the researchers found out that the compromised distribution
server also contained a cryptomining utility, as well as many other exploits and
common hacking tools.


PROTECTION

Since these seemingly legitimate services can be used by criminals on both ends,
both to anonymize their activities and to sell others’ resources, we would
rather see them disappear altogether, but they should at least improve the
verification of their customers and their participants.

Home users can protect themselves from proxyjacking by:

 * Keeping their systems and software updated
 * Use an effective and secure password strategy

Corporate users can add:

 * Monitor network traffic for anomalies
 * Keep track of running containerized applications.
 * Using key-based authentication for SSH instead of passwords

Akamai added:

> “In this particular campaign, we saw the use of SSH to gain access to a server
> and install a Docker container, but past campaigns have exploited web
> vulnerabilities as well. If you check your local running Docker services and
> find any unwanted resource sharing on your system, you should investigate the
> intrusion, determine how the script was uploaded and run, and perform a
> thorough cleanup.”

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help protect your business? Get in touch.

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--------------------------------------------------------------------------------

ABOUT THE AUTHOR

Pieter Arntz
Malware Intelligence Researcher

Was a Microsoft MVP in consumer security for 12 years running. Can speak four
languages. Smells of rich mahogany and leather-bound books.


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