Security Market Segment LS
Tuesday, 21 August 2018 10:50

New Windows ransomware being used in targeted campaigns

New Windows ransomware being used in targeted campaigns Pixabay

Windows ransomware known as Ryuk has been used in a number of well-targeted campaigns over the last two weeks, encrypting hundreds of PCs, storage and data centres in each infected firm, the security firm Check Point says.

Researchers at the company said that while the capabilities of Ryuk were not overly impressive, the organisations that had been affected had paid out large sums as ransoms.

The ransom amount demanded ranged from 15 bitcoin to 50 bitcoin and the attackers had already made about US$640,000, Check Point said.

The source code of Ryuk had some similarities to an older ransomware strain, known as HERMES, with the latter linked to a North Korean group known as the Lazarus Group.

Hence, Check Point said this could be another case of malware emanating from the same group, or else from some attacker who had managed to obtained the HERMES source code and created a variant.

Check Point said one distinguishing feature of Ryuk was that it was not distributed through big spam campaigns, but rather appeared to be intentionally built for small, targeted operations.

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

"Its alleged attribution to Lazarus Group... may imply that the attackers are already well experienced in the targeted attacks domain, as seen by attacks such as the breach of Sony Pictures in 2014."

The ransom note that accompanied Ryuk had two versions: one, a long well-worded note and the second a more abrupt missive.

Check Point has a detailed, technical analysis of Ryuk here, where it compares the ransomware to HERMES.

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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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