A botnet has been attacking and gaining access to other web shells (backdoors on web servers) for more than a year, security researchers at Positive Technologies have revealed today.
The researchers linked the botnet to an old trojan named Neutrino (also known as Kasidet), the operators of which appear to have shifted their targeting from user desktops to web servers, on which they install an encryption malware.
Οι ερευνητές της Positive Technologies αναφέρουν ότι αυτή η νέα φάση λειτουργίας της συμμορίας Neutrino ξεκίνησε στις αρχές του 2018, όταν η team κατάφερε να αναπτύξει ένα πολυλειτουργικό botnet που ανίχνευε τυχαίες διευθύνσεις IP στο διαδίκτυο αναζητώντας συγκεκριμένες εφαρμογές και διακομιστές που μπορούσε να μολύνει.
To hack other servers, the Neutrino botnet uses various techniques, such as exploits for old and new vulnerabilities, vulnerabilities in phpMyAdmin servers that do not have a password, and brute-force attacks on root accounts on phpMyAdmin, Tomcat and MS-SQL.
The researchers also report that the Neutrino does strange things, not seen in many others botnets. For example, this particular Neutrino looks for Ethereum nodes running with default passwords, connects to those systems, and steals files stored locally.
Neutrino as mentioned in the title also focuses on hacking web shells.
Web shells are backdoors that hackers use to perform operations on a compromised machine. They have a web-based interface from which hackers can log in and issue commands through their browser, or a special programmed environment with which they send automated commands.
According to Positive Technologies researchers, Neutrino searches the web for 159 different types of PHP web shells and two JSPs (Java Server Pages).
The botnet creates a list of web shells and then launches brute-force attacks to guess login credentials and gain access.
As for Neutrino's success, Positive Technologies reports that the botnet was one of the three largest queries senders to their honeypots.
Based on the company's research, the botnet has proven to be quite successful in infecting Windows servers with phpStudy, an integrated learning environment popular among Chinese developers.
However, it also attacks phpMyAdmin servers.
"To protect servers from Neutrino infection, we recommend that administrators check the password on the phpMyAdmin root account," said Kirill Shipulin, a security researcher at Positive Technologies.
“Make sure your services are up to date and install the latest updates. Remember that Neutrino is regularly updated with new exploits. ”
Technical details on the Neutrino modus operandi can be found at Publication by Positive Technologies.
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