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UNC2546 is a cybercriminal threat cluster publicly associated with activity around the Accellion FTA intrusion wave and the DEWMODE web shell. Reporting has linked the cluster to broader Russian-language cybercrime ecosystems and noted possible ties or overlap with FIN11 and the Cl0p ransomware operation. UNC2546 has also been mentioned alongside UNC2582 in connection with DEWMODE-enabled post-compromise activity. The cluster is associated with exploitation of internet-facing file transfer infrastructure, deployment of web shells for remote command execution, file retrieval, and evidence removal, and follow-on intrusion activity oriented toward data theft. Observed tradecraft includes vulnerability exploitation for initial access, use of specialized malware implants, attempts to obtain or abuse administrative access, lateral movement within victim environments, and exfiltration of sensitive, customer, and financial information. The operational objective reflected in attributed activity is financial gain rather than espionage. UNC2546 has been referenced in reporting on campaigns affecting organizations across multiple regions, including North America, Europe, and Asia-Pacific, and across sectors such as critical infrastructure, transportation and logistics, manufacturing and supply chain, and financial services. The actor’s ecosystem-level associations with Cl0p also align it with large-scale extortion operations centered on mass exploitation of managed file transfer products and theft-first pressure tactics. High-confidence reporting in this context supports UNC2546 as a financially motivated cybercriminal actor or cluster with strong links to data theft operations and possible ransomware-adjacent activity, but does not firmly establish UNC2546 itself as a distinct ransomware brand.
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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.
Attributed origin per open-source reporting.
6 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 malware families attributed to this actor across reporting.
8 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as a cybercriminal group associated with or adopting Cl0p malware.
Mentioned as a threat actor with possible ties to FIN11 in connection with Dewmode and Accellion FTA attack activity.
Match sector + geo + tech-stack targeting against your real footprint.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.