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Underground, also known as Team Underground, is a financially motivated ransomware and extortion operation. It has been identified as operating a dedicated leak site and publicly listing alleged victims, including healthcare entities. Underground was also associated with ransomware attacks against South Korean companies in 2024. Public leak-site listings are extortion claims and do not independently establish the scope or technical details of an intrusion.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Associated with healthcare-sector dedicated leak-site postings.
Underground is a ransomware group that targeted Korean companies in 2024.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
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Domains, IPs, and hashes tied to this actor, refreshed continuously.