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DLTMiner is a cryptocurrency-mining intrusion cluster known for opportunistic post-exploitation activity against vulnerable Microsoft Exchange servers during the 2021 ProxyLogon exploitation wave. It has been identified as one of multiple groups that abused the Exchange vulnerabilities CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065. Reporting links the group to deployment of PowerShell downloaders and to hijacking web shells previously installed by other threat actors, indicating a pragmatic approach focused on monetizing already-compromised systems rather than exclusive initial compromise. DLTMiner is generally characterized as a cryptomining actor rather than a ransomware or espionage operator. High-confidence public reporting in this context supports its role in Exchange-focused post-compromise activity and miner deployment, but does not provide sufficient corroborated detail on broader tooling, victimology, or organizational structure beyond its association with cryptocurrency mining operations.
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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.
Attributed origin per open-source reporting.
4 CVEs this actor has used in observed campaigns. 4 of them exploited in the wild.
Previously, Eset reported that about five APT groups has been exploiting the four Exchange vulnerabilities - CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065 ... Security firm Volexity spotted hackers targeting Exchange servers on Jan. 3, when it saw CVE-2021-26855 being exploited.
Previously, Eset reported that about five APT groups has been exploiting the four Exchange vulnerabilities - CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065
Previously, Eset reported that about five APT groups has been exploiting the four Exchange vulnerabilities - CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065
Previously, Eset reported that about five APT groups has been exploiting the four Exchange vulnerabilities - CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as another cryptocurrency miner observed in parallel post-exploitation activity against Exchange zero-days.
Follow-on activity leveraging previously-compromised Exchange servers; deployed PowerShell downloaders and likely hijacked existing web shells left by other actors.
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.