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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: Ryuk

NamesRyuk
CategoryMalware
TypeRansomware, Big Game Hunting
DescriptionRyuk is a ransomware which encrypts its victim's files and asks for a ransom via bitcoin to release the original files. It is has been observed being used to attack companies or professional environments. Cybersecurity experts figured out that Ryuk and Hermes ransomware shares pieces of codes. Hermes is commodity ransomware that has been observed for sale on dark-net forums and used by multiple threat actors.
Information<https://www.crowdstrike.com/blog/big-game-hunting-with-ryuk-another-lucrative-targeted-ransomware/>
<https://www.csoonline.com/article/3541810/ryuk-ransomware-explained-a-targeted-devastatingly-effective-attack.html>
<https://www.cybereason.com/blog/triple-threat-emotet-deploys-trickbot-to-steal-data-spread-ryuk-ransomware>
<https://research.checkpoint.com/ryuk-ransomware-targeted-campaign-break/>
<https://www.fireeye.com/blog/threat-research/2019/01/a-nasty-trick-from-credential-theft-malware-to-business-disruption.html>
<https://www.fireeye.com/blog/threat-research/2019/04/pick-six-intercepting-a-fin6-intrusion.html>
<https://securingtomorrow.mcafee.com/other-blogs/mcafee-labs/ryuk-ransomware-attack-rush-to-attribution-misses-the-point/>
<https://thedfirreport.com/2020/10/08/ryuks-return/>
<https://cofense.com/the-ryuk-threat-why-bazarbackdoor-matters-most/>
<https://www.deepinstinct.com/2020/11/24/ryuk-ransomware-the-deviance-is-in-the-variance/>
<https://www.cybereason.com/blog/cybereason-vs.-ryuk-ransomware>
Malpedia<https://malpedia.caad.fkie.fraunhofer.de/details/win.ryuk>
AlienVault OTX<https://otx.alienvault.com/browse/pulses?q=tag:Ryuk>

Last change to this tool card: 06 January 2021

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All groups using tool Ryuk

ChangedNameCountryObserved

APT groups

XFIN6, Skeleton Spider[Unknown]2015-Mar 2020 

Other groups

XUNC1878[Unknown]2020 
XWizard Spider, Gold BlackburnRussia2014-Nov 2020 HOTX

3 groups listed (1 APT, 2 other, 0 unknown)

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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