How to Prepare for and Respond to State-Sponsored Cyber Intrusions
Summary
Talos explains how state-sponsored actors use legitimate credentials, trusted tools, and long-term access to evade detection, and outlines preparation and response measures including centralized logging, identity controls, OT segmentation, and supply-chain readiness.
Key points
- State-sponsored actors may rely on stolen credentials, supply-chain access, and legitimate administrative tools to blend in, pursue espionage, and maintain covert access.
- Recommended visibility measures include command-line and PowerShell logging, Sysmon on prioritized systems, centralized write-once log storage, and network and DNS monitoring.
- Continuously updated behavioral baselines and monitoring of authentication activity can help surface low-and-slow lateral movement and credential abuse.
- Incident-response plans should account for adversaries potentially observing internal communications, with out-of-band communications and pre-established contacts at authorities and CERTs.
- Organizations with OT should plan for live-system investigation, constrained patching, and stronger IT/OT separation, including hardware-enforced unidirectional gateways.
- Supply-chain preparation includes maintaining software and firmware inventories, mapping vendor access, and defining notification and response procedures in advance.
- For resource-constrained teams, the article prioritizes enabling existing logging, securing administrative identities with MFA and tiered access, and focusing monitoring on critical systems.
Article Details
- Topic
- Incident response preparation for state-sponsored cyber threats
Threat Actors
Tools
PowerShellactors increasingly operate using tools already present on the target's systems, such as PowerShell, WMI, and PsExec, or they take time to observe what tools are used in the environment. If thePsExecincreasingly operate using tools already present on the target's systems, such as PowerShell, WMI, and PsExec, or they take time to observe what tools are used in the environment. If the environment uses SCCM orSysmonSysmon: Deploy with a configuration tuned to detect suspicious parent-child process relationships, flagging legitimate binaries used as proxies for malicious activity, both on Windows and Linux environments. WMIactors increasingly operate using tools already present on the target's systems, such as PowerShell, WMI, and PsExec, or they take time to observe what tools are used in the environment. If the environment uses
Countries
DPRKFor planted insiders, the DPRK IT worker scheme being the most documented example, hiring verification needs to go beyond standard background checks. This includes live, multi-stage video interviews with livenessUnited Statestraffic patterns. If the objective is pre-positioned disruption, as CISA assessed with Volt Typhoon in U.S. critical infrastructure, the actor may take no visible action during peacetime. Salt Typhoon's access to
Industries
Energyconstraint: OT systems often cannot be taken offline for forensic imaging, as production shutdowns in energy, water, or manufacturing carry significant safety and economic consequences.Investigations must workManufacturingoften cannot be taken offline for forensic imaging, as production shutdowns in energy, water, or manufacturing carry significant safety and economic consequences.Investigations must work around live systems. waterby moving from compromised IT infrastructure toward OT-adjacent systems, including those controlling water treatment plants and electrical substations. Through 2025, the group progressed from IT reconnaissance to