Hardening US Infrastructure Before a Potential Iranian Cyber Attack

After recent U.S. strikes on Iranian nuclear facilities, the United States is on high alert for potential Iranian retaliation in cyberspace. Cyber attacks offer Iran a low-cost, high-impact way to respond without triggering a conventional military escalation. Digital strikes are also harder to trace than missiles or drones, giving Iran plausible deniability while still achieving strategic disruption. Officials from the Federal Bureau of Investigation, National Security Agency, and Cybersecurity and Infrastructure Security Agency warn that Iran’s attacks will likely target U.S. critical infrastructure and high-profile officials. The United States should prepare now, not just because of Iran’s potential intent, but because of its proven capability.

Over the past decade, Iran has developed a strong and persistent cyber program. State-backed advanced persistent threat (APT) groups like APT 33, APT 34, and APT 42, along with ideologically aligned hacktivist fronts, have repeatedly breached U.S. networks, especially those tied to critical infrastructure and government entities. These groups collaborate closely, sharing malware, credentials, and access strategies. They often infiltrate networks long before launching attacks. In many instances, these groups employ “living-off-the-land” techniques, exploiting legitimate admin tools already present in a system to carry out their activities. These methods enable Iranian actors to maintain access while staying hidden and launch attacks at any given time while evading most traditional cybersecurity defenses.

Iran has steadily evolved its offensive playbook, adopting more aggressive tactics. These include multi-factor authentication (MFA) push bombing—flooding users with login requests until one is accepted—and credential overload attacks that bypass identity checks. Spear phishing also remains a central tactic via emails disguised as urgent or official messages targeting infrastructure employees. In some cases, Iranian hackers have deployed zero-day exploits—previously unknown software vulnerabilities—to access sensitive networks undetected.

Iran often pairs its cyber attacks with disinformation campaigns to sow panic and mistrust. They flood social media, websites, and alert systems with false claims to spread panic. After recent hostilities between Israel and Iran, many Israelis received fake alerts impersonating the Home Front Command, warning of nationwide fuel shortages and imminent terrorist bombings. These disinformation tactics, used to sow fear and confusion, could be easily replicated in the United States to undermine public trust and destabilize institutions. Iran has also launched distributed denial-of-service (DDoS) attacks to disable government websites and apps, conducted smear campaigns against political figures, most recently Trump administration officials, such as the White House Communications Director Steven Cheung and top presidential aides, to discredit U.S. leadership. These tactics reflect a level of coordination, sophistication, and strategic patience that warrants serious attention.

Iranian cyber teams have repeatedly targeted systems Americans rely on. In 2018, they attacked networks linked to Atlanta’s airport and seaport. In 2020, they posed as Proud Boys operatives to send threatening emails during the U.S. election, aiming to spread fear and undermine trust. In 2023, Iranian-linked hackers targeted water utilities in Pennsylvania and Texas, exploiting Internet-connected devices to access vulnerable systems. With minimal cost and attribution risk, these attacks offer Tehran a way to generate domestic disruption. As tensions rise, critical infrastructure remains a likely and vulnerable target.

To counter these risks, the U.S. government should act fast. The Trump administration should direct the Cybersecurity and Infrastructure Agency (CISA) to first rebuild public-private collaboration by reviving the Critical Infrastructure Partnership Advisory Council (CIPAC), creating a formal structure for real-time intelligence sharing and joint threat modeling across federal, state, local, and private-sector entities. At the same time, CISA should work with state and local municipalities to harden soft targets—systems, networks, or local services that are easy for hackers to attack because they lack strong defenses, such as outdated software or weak security settings—by conducting nationwide vulnerability audits, modernizing outdated systems, and upgrading authentication protocols, including biometric and behavior-based authentication.

Finally, the federal government should work with state and local agencies to establish baseline cybersecurity standards across all critical infrastructure. Much like standards for clean air and water protect Americans’ physical safety, cyber standards should protect America’s digital safety. Whether public or private, every utility and transit system should meet minimum security expectations supported by federal mandates, incentives, and regular red-teaming and joint response exercises.

Even if the immediate threat from Iran passes, U.S. critical infrastructure is still vulnerable to attacks from state-backed cyber attackers in Russia, North Korea, and China. The time to act is now. Once a cyberattack begins, the response window narrows, and the damage becomes harder to contain. Building a coordinated, national cybersecurity posture has never been optional and only grows more essential as threat actors continue to evolve. Preparing for cyber attacks isn’t just about defense; it’s about building lasting digital resilience before the next strike hits.