Western Cybersecurity Experts Brace for Iranian Reprisal

US and Israel May Have Launched 'Largest Cyberattack in History' Against Tehran David Meyer • March 1, 2026

Organizations across the West and allied nations should prepare for Iranian cyberattacks in the wake of Israeli and U.S. ongoing strikes, threat intelligence firms warned as the first signs of the Iranian cyber counteroffensive became clear on Sunday.

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"This is not a theoretical scenario - Iran-backed groups are confirmed escalating operations," security operations center software maker Anomali warned in a Saturday brief, Iranian threat actors tracked as MuddyWater, APT42 and APT33 units were "activated and retooling before the kinetic trigger." The company expressed concern over apparent silence from Iran's APT34, writing that "Iran's most prolific espionage group has been undetected for the ...