A joint cybersecurity advisory issued by the Federal Bureau of Investigation, Cybersecurity and Infrastructure Security Agency, National Security Agency, and several sector-specific partners warns US organisations of an ongoing campaign by actors targeting industrial control systems across US critical infrastructure.
The activity focuses on internet-exposed operational technology (OT), particularly programmable logic controllers (PLCs), which are widely used to automate industrial processes in sectors such as energy, water and wastewater systems, and government services.
According to the advisory, the attackers are exploiting PLCs by leveraging their direct exposure to the internet. The attackers gain initial access by scanning for internet-facing PLCs and connecting through commonly used industrial communication ports. Once access is established, the actors interact with device project files and manipulate data displayed on human-machine interfaces (HMI) and supervisory control and data acquisition (SCADA) systems. This enables them to disrupt industrial processes in real time. In several confirmed cases, such intrusions have resulted in operational disruption and financial loss, underscoring the tangible, physical-world impact of these cyber operations.
The advisory provides a detailed set of indicators of compromise (IOCs), including specific IP addresses associated with malicious activity, along with mappings to the MITRE ATT&CK framework to help defenders contextualise tactics and techniques.
Organisations are strongly encouraged to review both current and historical network logs for signs of compromise, particularly for unusual traffic on ports commonly used by OT protocols.
The campaign appears to be part of a broader escalation in Iranian-linked cyber activity, likely tied to geopolitical tensions involving the USA and its allies. The advisory links the activity to previously identified advanced persistent threat (APT) groups associated with Iran’s Islamic Revolutionary Guard Corps (IRGC).
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