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An exposed open directory at a staging server revealed an active intrusion by operators linked to The Gentlemen ransomware group. The operation involved establishing persistent access through privileged account creation, credential theft via LSASS dumping, and lateral movement across a Windows domain. Attackers deployed multiple implants including EtherRAT, which retrieves command-and-control domains from an Ethereum smart contract, alongside Sliver and custom Go reverse shells. Lateral movement was achieved through remote scheduled tasks distributing MSI payloads, while security products were disabled and reverse tunnels established for persistent access. The infrastructure and tactics align with previously documented The Gentlemen campaigns, including a ClickFix operation deploying EtherRAT.
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