Data Exfiltration Attack Analysis: Tactics and Mitigation in Manufacturing Sector Breach

ReliaQuest responded to a July 2024 data exfiltration incident in which a threat actor likely brute-forced an internet-facing Fortinet firewall, abused a privileged service account to pivot via SSH/RDP, created persistent administrator accounts, used living-off-the-land discovery, retrieved payloads from cloud-hosted C2 servers, and attempted to exfiltrate compressed data via SCP over non-standard ports; containment, account resets, and GreyMatter playbooks stopped further damage and the IOCs were added to GreyMatter Intel. Key mitigations recommended include patching perimeter devices, enforcing service-account hardening, full EDR coverage, network segmentation, file integrity monitoring, and automated response playbooks to reduce mean time to contain.