Security Market Segment LS
Tuesday, 16 July 2019 09:44

Ransomware uses brute-force SSH attacks to infect Linux-based NAS servers

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Ransomware uses brute-force SSH attacks to infect Linux-based NAS servers Image by mikex7 from Pixabay

Ransomware that uses SSH brute force attacks to gain access to Linux-based network-attached storage systems has been spotted by the security firm Intezer.

One victim who was tracked down by the company confessed that he/she had not bothered to even set a password for the server in question.

The company said it had named the ransomware QNAPCrypt as this appeared to be the name given to it by the authors. QNAP sells NAS servers.

Intezer's Ignacio Sanmillan said the detection rate of the ransomware was quite low, adding that there were both ARM and x86 variants.

He said the ransom note was included as a text mile and contained no message. Every victim whom Intezer had tracked down was given a unique bitcoin address to pay the ransom.

message qnapcrypt

A message from a user whose NAS server was infected, indicating the laxity in password policy. Courtesy Intezer

Additionally, once a server was compromised, QNAPCrypt sought a wallet address and a public RSA key from its command and control server before encrypting files.

Sanmillan said Intezer simulated a denial of service attack on the infrastructure used by the malware.

"After simulating the infections of hundreds of virtual “victims”, we discovered two major design flaws in the ransomware infrastructure which led us to seize the operation," he wrote.

One was that the list of bitcoin wallets was created in advance and it was static. "Therefore, it does not create a new wallet for each new victim in real time, but rather it pulls a wallet address from a fixed, predetermined list."

The second characteristic was that once all of the wallets were allocated (or sent), the ransomware would not be able to continue its malicious operation in the victim’s machine.

After simulating the infection of more than 1091 victims, Sanmillan said the number of bitcoin wallet addresses ran out. "As a result, any future infection will be unsuccessful and the authors behind this malware were forced to update their implants in order to circumvent this design flaw in their infrastructure to continue with their malicious operations," he wrote.

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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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