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After a U.S. strike killed Iranian commander Qasem Soleimani on January 3, 2020, officials and analysts warned that Iran could retaliate in cyberspace. That warning described a risk, not proof that a major Iranian state cyberattack followed. Later records document charges over alleged retaliatory website defacements, while subsequent agency advisories describe separate Iranian-affiliated activity.
What happened after the January 3, 2020 strike?
The U.S. strike killed Qasem Soleimani, commander of Iran’s Islamic Revolutionary Guard Corps-Quds Force. In the immediate aftermath, cybersecurity officials and analysts highlighted cyber operations as one possible asymmetric response. CyberScoop reported that then-CISA director Chris Krebs urged U.S. companies to watch for Iranian cyber activity, particularly involving industrial control systems. The article also quoted BAE Systems threat-intelligence head Adrian Nish calling cyber operations “an attractive, asymmetric option at Tehran’s disposal,” and then-Secretary of State Mike Pompeo describing Iran’s capability as “deep and complex.” These were attributed assessments, not a quantified ranking of Iran’s technical ability. CyberScoop’s January 2020 report records the contemporaneous warnings.
A congressional hearing record later recounted a DHS bulletin warning that Iran had a “robust cyber program,” could at minimum temporarily disrupt U.S. critical infrastructure, and might act with little or no warning. That was a warning issued in the 2020 crisis, not a present-day estimate. The House hearing transcript preserves that dated context.
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DOJ’s 2020 charges over alleged website defacements
In September 2020, the U.S. Department of Justice announced charges against two alleged hackers, saying they damaged multiple U.S. websites in retaliation for the strike. The legal claim is an allegation against the charged individuals; it is not proof of a centrally directed campaign by Tehran. The reported website defacements also should not be conflated with an attack that disrupted critical infrastructure. DOJ’s announcement describes the charges and alleged conduct.
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What the record does not show
The cited material does not establish that Iran carried out every feared scenario, that the alleged hackers acted under direction from the Iranian government, or that later operations by Iranian-affiliated actors were motivated by Soleimani’s death. It also does not provide a reliable numerical probability of a cyberattack after the strike or a single score for Iran’s cyber capability. Capability assessments, warnings, and attributed incidents answer different questions; none alone proves a specific order or motive.
What later advisories say about Iranian-affiliated activity
December 18, 2024: internet-exposed operational technology
A revised CISA joint advisory dated December 18, 2024 describes IRGC-affiliated persona CyberAv3ngers targeting internet-connected Israeli-made Unitronics programmable logic controllers (PLCs) and human-machine interfaces (HMIs). The advisory says affected devices were found in multiple U.S. states and foreign countries, including in water and wastewater systems and other sectors. It is a concrete example of an operational-technology threat, but the advisory does not present it as retaliation for Soleimani’s killing. Read CISA’s advisory on CyberAv3ngers activity.
June 30, 2025: agencies warn of opportunistic targeting
In a joint fact sheet published June 30, 2025, CISA, the FBI, DC3, and NSA urged vigilance amid the geopolitical environment at that time. The agencies described likely target-of-opportunity activity against vulnerable devices and networks, including exploitation of known vulnerabilities and weak or default passwords. The fact sheet also warned of likely increased distributed denial-of-service (DDoS) activity, possible ransomware collaboration, and hack-and-leak activity. This is a dated warning, not an assessment of threat conditions in September 2026, and it does not establish that every listed activity occurred in response to the 2020 strike. The joint fact sheet provides the agencies’ warning and recommendations.
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2024 FBI testimony: capability is not attribution
FBI testimony in 2024 said Iran had options that included cyber operations intended to sabotage public and private infrastructure. The testimony also discussed plots and threats connected to Soleimani’s death. Those are distinct statements: a general capability to conduct cyber operations does not attribute every cyber incident to a retaliatory order. The FBI testimony record should be read in its dated context.
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Practical steps for organizations
The agency advisories support a defense focused on reducing exposure and limiting the impact of compromise. Their guidance applies to organizational networks and operational technology; it does not require a particular vendor or product.
- Reduce internet exposure: Remove OT and industrial-control devices from public internet access where possible. If remote access is necessary, restrict it and monitor its use.
- Fix known weaknesses: Patch internet-facing systems and prioritize vulnerabilities that are known to be exploited.
- Strengthen access: Replace default and weak passwords with strong, unique credentials. Use multifactor authentication, especially for remote access and OT networks.
- Watch for changes: Review access logs and monitor configuration changes so suspicious access or unexpected device changes are more likely to be noticed.
- Plan for disruption and disclosure: Maintain incident-response and recovery plans, including backups. Prepare for data theft and public leaks as well as encryption or service disruption.
These measures reflect recommendations in the June 2025 joint fact sheet and CISA’s OT advisory.
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