1200KM / detection
T1691 Block Operational Technology Message — Detection Rules
Detection workspace for T1691 Block Operational Technology Message: 0 Sigma sources, 0 Atlas concepts and 0 anomaly models. No live detection validation.
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
DET0903 Detection of Block Operational Technology Message
AN2046 Analytic 2046
Real-time monitoring identifies iptables/nftables rule changes on Industrial Control System (ICS) Linux gateways that selectively block one ICS communication traffic type. OT operational-fidelity gate: Alert only when the action is not attributable to an authorized operator/engineering source for the specific target and function, and it is either outside an approved change/maintenance window or lacks matching change-control context; where telemetry permits, require corroborating device, configuration, or process-state effect. Suppress activity that fully matches approved maintenance, commissioning, failover, recovery, or tested control procedures.
AN2213 Analytic 2213
Real-time monitoring identifies an abrupt cessation of expected Industrial Control System (ICS) protocol traffic between a Supervisory Control and Data Acquisition (SCADA)/control server and a field device, without a corresponding device alarm or scheduled maintenance event, while the device remains reachable for at least some traffic types. This technique-level analytic synthesizes Command Message blocking (T1691.001) and Reporting Message blocking (T1691.002). OT operational-fidelity gate: Alert only when the action is not attributable to an authorized operator/engineering source for the specific target and function, and it is either outside an approved change/maintenance window or lacks matching change-control context; where telemetry permits, require corroborating device, configuration, or process-state effect. Suppress activity that fully matches approved maintenance, commissioning, failover, recovery, or tested control procedures.
AN2266 Analytic 2266
Real-time monitoring identifies Windows host-based firewall or network policy changes that selectively block Industrial Control System (ICS) communication traffic types from Supervisory Control and Data Acquisition (SCADA)/Distributed Control System (DCS) hosts. OT operational-fidelity gate: Alert only when the action is not attributable to an authorized operator/engineering source for the specific target and function, and it is either outside an approved change/maintenance window or lacks matching change-control context; where telemetry permits, require corroborating device, configuration, or process-state effect. Suppress activity that fully matches approved maintenance, commissioning, failover, recovery, or tested control procedures.
Connected ecosystem references
Linked tags
Simulation, tools and telemetry
No reviewed association in this snapshot.
Existing anomaly research
Complete technique engineering workbook
Collection configuration and event examples · Anomaly models and design worksheet · Tools and documented software · Simulation procedures · Offline synthetic collection check
Exact source tags are not semantic relevance verdicts. Review actual rule conditions and observation points; imported rules are not backend-compiled or live-validated.
Pinned research references. No browser attack runner or production-validated detector is asserted. Imported procedures remain unvalidated; any bounded lab evidence has its own scope. ATT&CK / Atomic provenance · Detection provenance.