President Trump may have pulled back at the 11th hour from airstrikes on Iranian radar and military targets, but U.S. Cyber Command did hit cyber targets within the Iranian intelligence apparatus last week.

The U.S. cyberattacks, okayed by the president, hit systems within the Iranian intel network, the Wall Street Journal reported, and came as officials expressed concern that Iran would launch offensive cyber actions of its own against the U.S.

“Iranian regime actors and proxies are increasingly using destructive ‘wiper’ attacks, looking to do much more than just steal data and money,” Department of Homeland Security (DHS) Cybersecurity and Information Security Agency (CISA) Director Christopher Krebs warned in a statement tweeted out Saturday. “These efforts are often enabled through common tactics like spearphishing, password spraying and credential stuffing.”

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