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Threat Group Cards: A Threat Actor Encyclopedia

Tool: Ryuk

Names	Ryuk
Category	Malware
Type	Ransomware, Big Game Hunting
Description	Ryuk 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> <https://www.advanced-intel.com/post/crime-laundering-primer-inside-ryuk-crime-crypto-ledger-risky-asian-crypto-traders> <https://www.cert.ssi.gouv.fr/uploads/CERTFR-2021-CTI-006.pdf> <https://www.darkreading.com/vulnerabilities---threats/ryuks-rampage-has-lessons-for-the-enterprise/a/d-id/1340533> <https://www.advanced-intel.com/post/adversary-dossier-ryuk-ransomware-anatomy-of-an-attack-in-2021> <https://news.sophos.com/en-us/2021/05/06/mtr-in-real-time-pirates-pave-way-for-ryuk-ransomware/> <https://securityintelligence.com/articles/ryuk-ransomware-operators-shift-tactics/> <https://www.mcafee.com/blogs/other-blogs/mcafee-labs/new-ryuk-ransomware-sample%e2%80%aftargets-webservers/>
MITRE ATT&CK	<https://attack.mitre.org/software/S0446/>
Malpedia	<https://malpedia.caad.fkie.fraunhofer.de/details/win.ryuk>
AlienVault OTX	<https://otx.alienvault.com/browse/pulses?q=tag:Ryuk>
Playbook	<https://pan-unit42.github.io/playbook_viewer/?pb=ryuk-ransomware>

Last change to this tool card: 30 December 2022

Download this tool card in JSON format

All groups using tool Ryuk

Changed	Name	Country	Observed
APT groups
	FIN6, Skeleton Spider	[Unknown]	2015-Oct 2021
	Wizard Spider, Gold Blackburn		2014-May 2025
Other groups
	UNC1878	[Unknown]	2020

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

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