Security researchers have uncovered hundreds of instances of a Chinese-developed AI hacking tool that are publicly accessible on the internet, potentially enabling outsiders to launch cyberattacks against unsuspecting victims. The software, known as Artex, is an open-source autonomous penetration testing tool—software that automatically scans computer systems for vulnerabilities—and has been connected to multiple cyberattacks since its public release in July. Because it is open-source, anyone can freely download and run it on their own servers, making it a popular choice for those who lack access to the most advanced cybersecurity AI models from Anthropic or OpenAI for discovering security flaws. Microsoft has previously characterized Artex as a system of AI agents capable of conducting cyberattacks "from reconnaissance through data exfiltration with little needed human interaction."

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In a blog post, cybersecurity firm Censys, which scans the internet for exposed or vulnerable systems, reported identifying more than 800 distinct deployments of Artex that were accessible from the web without requiring a password to log in. Silas Cutler, principal security researcher at Censys who authored the blog post, noted that not every Artex instance is operated with malicious intent and that many are used by authorized testers. However, it remains unclear why hundreds of these Artex systems are exposed to the web, since the software does not require internet accessibility. These findings highlight how even powerful hacking tools can be misconfigured to be publicly accessible by anyone, increasing the likelihood that someone will find and misuse them. The publicly accessible systems also expose attack tools, such as implants (hidden malicious software) used to compromise and maintain persistent access to a victim's network. Security companies have linked Artex usage to several large-scale cyberattacks, including one against the Korean finance industry in September. Cybersecurity giant CrowdStrike attributed those attacks to a Chinese-speaking hacker who used an Artex instance, partly because the hacker had left an "open directory" hosting the system. Censys stated that its data showed the Artex instance in question had been publicly exposed for months and appeared to contain more attack data extending "well beyond South Korean banks," including payment and gaming companies. Artex was also used in an attack on IT support giant ConnectWise earlier in October, which allowed Chinese-linked hackers to spy on thousands of organizations whose data and files are hosted in Microsoft's cloud. Microsoft, which has visibility into the attack, said in a blog post that the hackers used Artex to break into customers' cloud environments and steal their data at such speed that defenders had "little time to detect and respond."

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Many of the attacks linked to Artex involved exploiting simple vulnerabilities, such as guessing weak or known passwords, and a lack of multi-factor authentication. The findings demonstrate that simple vulnerabilities, including misconfigurations, can expose both the attacker and their targets. Artex has since announced it would go closed-source, effectively limiting further releases to paid customers. There are still dozens of copies of Artex's code available on code-sharing sites that can still be used in active attacks.