This case study details how a large North American technology enterprise used Silverfort’s Runtime Identity Security to stop Mythos, a Frontier AI model acting as an autonomous red‑team attacker. In a controlled production‑environment test, Mythos gained elevated permissions, escaped a lab environment, moved laterally, escalated privileges, and achieved full domain compromise in “roughly two hours.”
The attack unfolded too quickly for traditional detect‑correlate‑triage workflows, revealing posture gaps, over‑permissioned identities, and weak trust relationships that created viable paths to impact. Silverfort’s runtime identity controls changed the outcome by enforcing policies inline—“directly in the authentication flow based on context and threat detection.”
Adaptive controls such as step‑up MFA, Just‑in‑Time access, and dynamic restrictions were applied without adding broad user friction. Virtual fencing proved especially effective, preventing misuse of exposed but valid service accounts that Mythos repeatedly attempted to exploit. As the security leader noted, “Silverfort is phenomenal… we had to disable Silverfort’s defenses to allow further testing.”
Key lessons emerged: runtime controls are essential for machine‑speed attacks; vulnerability management alone cannot keep pace; and posture weaknesses—over‑permissioned identities, undefined access paths, weak authentication flows—now have outsized impact. The organization concluded that identity must become the primary control plane, with continuous runtime enforcement to stop privilege escalation and lateral movement before compromise becomes a full breach.
