Security Market Segment LS
Wednesday, 11 December 2019 09:39

Security firm warns Ryuk ransomware decryption tool may not work

By
Security firm warns Ryuk ransomware decryption tool may not work Image by mohamed Hassan from Pixabay

The security firm Emsisoft has warned anyone hit by the Ryuk ransomware that the decryption tool supplied by the malicious attackers behind Ryuk may no longer be able to decrypt files that have been encrypted.

In a blog post, Emsisoft said this was because those behind Ryuk had made changes in the malware within the last fortnight that resulted in data being corrupted or lost while it was being encrypted on a victim's system.

"In one of the latest versions of Ryuk, changes were made to the way the length of the footer is calculated. As a result, the decryptor provided by the Ryuk authors will truncate files, cutting off one too many bytes in the process of decrypting the file," the company said.

Emsisoft's Brett Callow said that the company had devised a method to decrypt files that had been encrypted by Ryuk.

However for this to work, Emsisoft had to use the decryption key from the tool that the ransomware creators supplied. This meant that anyone who was attacked by Ryuk would have to pay the ransom.

"Most of our decryption tools exploit a weakness in the ransomware’s encryption to recover files," Callow told iTWire. "This tool doesn’t, as Ryuk’s encryption doesn’t have any weaknesses.

"What we do, in simple terms, is pull the decryption key from the tool the bad actor supplies (after the ransom is paid) and put it into our tool. The bad actor’s tool causes data loss; our tool does not."

Any victims needed to make back-ups of the files that were encrypted by Ryuk in order for this method to work. "If you’ve paid for a decryptor but have yet to use it, either back up your files before running it or get in touch with us instead," Emsisoft advised.

"Our tool will enable you to safely recover your data whereas the tool supplied by the bad actors will not."

DIGITAL MARKETING HAS NO SOCIAL DISTANCING OR TRAVEL RESTRICTIONS

As part of our Lead Machine Methodology we will help you get more leads, more customers and more business. Let us help you develop your digital marketing campaign

Digital Marketing is ideal in these tough times and it can replace face to face marketing with person to person marketing via the phone conference calls and webinars

Significant opportunity pipelines can be developed and continually topped up with the help of Digital Marketing so that deals can be made and deals can be closed

- Newsletter adverts in dynamic GIF slideshow formats

- News site adverts from small to large sizes also as dynamic GIF slideshow formats

- Guest Editorial - get your message out there and put your CEO in the spotlight

- Promotional News and Content - displayed on the homepage and all pages

- Leverage our proven event promotion methodology - The Lead Machine gets you leads

Contact Andrew our digital campaign designer on 0412 390 000 or via email andrew.matler@itwire.com

CONTACT US!

LAYER 1 ENCRIPTION A KEY TO CYBER-SECURITY SOLUTION

Security requirements such as confidentiality, integrity and authentication have become mandatory in most industries.

Data encryption methods previously used only by military and intelligence services have become common practice in all data transfer networks across all platforms, in all industries where information is sensitive and vital (financial and government institutions, critical infrastructure, data centres, and service providers).

Get the full details on Layer-1 encryption solutions straight from PacketLight’s optical networks experts.

This white paper titled, “When 1% of the Light Equals 100% of the Information” is a must read for anyone within the fiber optics, cybersecurity or related industry sectors.

To access click Download here.

DOWNLOAD!

Sam Varghese

website statistics

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.

VENDOR NEWS & EVENTS

REVIEWS

Recent Comments