0day Syndicate is a financially motivated ransomware group that first emerged with documented activity on May 28, 2026. The group operates by gaining unauthorized access to victim networks and deploying ransomware, threatening to leak sensitive data if ransom demands are not met. While generally operating under the name 0day Syndicate, there has been some potential confusion with a self-proclaimed ransomware-as-a-service collective named 0APT Syndicate, which was assessed as a likely scam or hoax group due to fabricated data samples. However, 0day Syndicate, as evidenced by multiple incident reports, has claimed responsibility for several cyberattacks and data exfiltration threats against various organizations. The group’s primary motivation is financial gain through extortion.

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