1200KM / detection
T0821 Modify Controller Tasking — Detection Rules
Detection workspace for T0821 Modify Controller Tasking: 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
DET0741 Detection of Modify Controller Tasking
AN1874 Analytic 1874
Real-time monitoring identifies an Industrial Control System (ICS) protocol write to a controller's task/organization-block configuration from a source not in the approved engineering workstation list, correlated against post-modification cycle timing deviation. Documented precedent: Stuxnet infected Siemens OB1 (main execution cycle block) so its malicious payload ran every cycle, and infected OB35 (watchdog/interrupt block) to suppress error reporting. 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.