RMM (Remote Monitoring and Management) tool abuse surged 277% in 2025, with attackers exploiting legitimate, pre-installed remote management software to gain stealthy, persistent access to business environments. Because trusted RMM binaries don't trigger security alerts, attackers use them to hide in plain sight, executing commands, moving laterally, and deploying ransomware. Common entry points include phishing emails disguised as e-signature requests, invoices, or file shares that trick users into installing malicious RMM agents. Defenses include defining a behavioral baseline for normal RMM activity, fingerprinting approved tools with executable hashes and allowed connection endpoints, and fostering a security-aware culture where anomalies are reported quickly. Over 50% of suspicious Atera RMM activity cases are linked to ransomware, and attacks can unfold within hours once access is established.
