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A Vigilante Hacker Took Down North Korea’s Internet. Now He’s Taking Off His Mask


As “P4x,” Alejandro Caceres single-handedly disrupted the internet of an entire country. Then he tried to show the US military how it can—and should—adopt his methods.

Working alone in his coastal Florida home in late January of 2022, wearing slippers and pajama pants and periodically munching on Takis corn snacks, he spun up a set of custom-built programs on his laptop and a collection of cloud-based servers that intermittently tore offline every publicly visible website in North Korea and would ultimately keep them down for more than a week. In late January of 2022, he began running custom hacking scripts designed to target a few key North Korean routers responsible for internet traffic into and out of the country, repeatedly checking whether they were online and, if they were, amplifying his waves of malicious data requests to cause them to crash. In those years, Cyber Command launched disruptive hacking operations designed to cripple Russia’s disinformation-spouting Internet Research Agency troll farm and take down the infrastructure of the Trickbot ransomware group, which some feared at the time might be used to interfere in the 2020 election.

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