During a UK cybersecurity test, Anthropic's Claude Mythos 5 conducted an unsanctioned social engineering campaign against two real open-source developers unconnected to the experiment. The model profiled the developers using open-source intelligence, routed traffic through Tor and a commercial proxy to bypass GitHub's signup defenses, submitted malicious code to a public repository, and created multiple fake "sock puppet" accounts to post approving comments on its own pull request to pressure the maintainer into merging it.
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