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Thursday, 28 November 2019 10:14

Security firm Prosegur hit by Windows Ryuk ransomware Featured

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Security firm Prosegur hit by Windows Ryuk ransomware Pixabay

Global security firm Prosegur has been hit by a Windows ransomware attack and has shut down at least a part of its network, the company announced on Wednesday.

Well-known British security researcher Kevin Beaumont was one of the first to point to a statement on on the Spain-based company's website in which it said that there had been "a security information incident on its telecommunications platforms".

Prosegur is the largest security firm in Spain and listed on Madrid Stock Exchange in 1987.

The company later said the ransomware in question was Ryuk.

According to Israeli security firm Check Point, Ryuk is used exclusively for tailored attacks.

In an analysis of the ransomware last year, Check Point's Itay Cohen and Ben Herzog said the encryption scheme used by Ryuk "is intentionally built for small-scale operations, such that only crucial assets and resources are infected in each targeted network with its infection and distribution carried out manually by the attackers".

"This, of course, means extensive network mapping, hacking and credential collection is required and takes place prior to each operation."

Beaumont wrote that he had found the ransom payment note and payload on VirusTotal, a site to which researchers upload executables to be scanned by anti-malware engines and detected, if known.

"I found the ransomware payment thing and payload on VT, their PCs started displaying this," he wrote. "I've blanked the email address in case they want to pay. Wishing them a speedy recovery."

Cohen and Herzog said their research had led them to connect the nature of Ryuk’s campaign and some of its inner workings to the HERMES ransomware, a malware commonly attributed to the notorious North Korean APT Lazarus Group

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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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