The recently discovered B0r0nt0K ransomware infects both Linux and Windows servers and demands $75,000 ransom to the victims.

A new piece of ransomware called B0r0nt0K appeared in the threat landscape, it is targeting web sites and demanding a 20 bitcoin ransom to the victims (roughly $75,000). This B0r0nt0K ransomware infects both Linux and Windows servers.

The news was first reported by Bleeping Computer, in a BleepingComputer forum post, a user reported the infection of a website running on Ubuntu 16.04. The ransom encrypts all files and renames them by appending . rontok extension to the file names. The user that disclosed the news on the forum was only able to provide the URL of the payment site located at https://borontok.uk/. To access the website the victim have to provide the personal ID.

According to the popular malware researcher Michael Gillespie, when the B0r0nt0K ransomware encrypts a file it will base64 the encrypted data.

“The file’s name will also be renamed by encrypting the filename, base64 encoding it, url encoding it, and finally appending the .rontok extension to the new file name. An example of a encrypted file’s name is zmAAwbbilFw69b7ag4G4bQ%3D%3D.rontok.” reported Bleeping Computer.

By accessing the payment site, the user will be presented with a payment page including payment instructions (i.e. Ransom amount, the bitcoin payment address, and the contact email info@botontok.uk). Experts pointed out that the malware author appears to be willing to negotiate the ransom amount.

BleepingComputer analyzed the source code of the payment site and discovered the string “Vietnamese Hacker” in a comment, a circumstance that could suggest that the malware author is Vietnamese.

Further details are reported in the post published on Bleeping Computer.

Pierluigi Paganini

( SecurityAffairs – B0r0nt0K ransomware , hacking)

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