T0849 Masquerading — Detection Rules

Source-backed rule directory

No reviewed association in this snapshot.

Atlas deterministic concepts

No exact concept selected.

Anomaly models

No exact Atlas model in this snapshot.

ATT&CK analytic guidance

DET0725 Detection of Masquerading

AN1858 Analytic 1858

Real-time monitoring identifies a process or scheduled task whose displayed name matches a known Industrial Control System (ICS) vendor application but whose on-disk binary hash or file path does not match the vendor-signed baseline. The mismatch -- name says one thing, binary integrity says another -- is the defining signal. OT operational-fidelity gate: Alert only when execution violates an approved signer/hash/path/parent/process or tool allowlist, or originates from an unauthorized user/tool, and is tied to an OT asset or follow-on OT-relevant action. Suppress vendor-signed software, approved engineering utilities, diagnostics, patching, backup, and documented maintenance.

AN2123 Analytic 2123

Real-time monitoring identifies a process whose executable name matches a known Industrial Control System (ICS) service daemon but whose execution path falls outside the documented vendor installation directories, or whose binary hash does not match the package manager's recorded checksum for that package. OT operational-fidelity gate: Alert only when execution violates an approved signer/hash/path/parent/process or tool allowlist, or originates from an unauthorized user/tool, and is tied to an OT asset or follow-on OT-relevant action. Suppress vendor-signed software, approved engineering utilities, diagnostics, patching, backup, and documented maintenance.

AN2231 Analytic 2231

Real-time monitoring identifies an ICS device presenting protocol identity attributes (for example vendor, product, model, or capability identifiers) that conflict with the identity and capabilities recorded for that network address/device in the authorized asset inventory. OT operational-fidelity gate: Alert only when execution violates an approved signer/hash/path/parent/process or tool allowlist, or originates from an unauthorized user/tool, and is tied to an OT asset or follow-on OT-relevant action. Suppress vendor-signed software, approved engineering utilities, diagnostics, patching, backup, and documented maintenance.

AN2287 Analytic 2287

Real-time monitoring identifies traffic on an Industrial Control System (ICS) protocol port (e.g., 502, 20000, 44818, etc.) with payload content that does not conform to the expected protocol structure for that port, suggesting non-ICS traffic tunneled over ICS port numbers to evade port-based filtering or blend with expected traffic patterns. OT operational-fidelity gate: Alert only when execution violates an approved signer/hash/path/parent/process or tool allowlist, or originates from an unauthorized user/tool, and is tied to an OT asset or follow-on OT-relevant action. Suppress vendor-signed software, approved engineering utilities, diagnostics, patching, backup, and documented maintenance.