Threat actors have exploited misconfigured Docker containers to deliver cryptomining malware.

“Docker implements virtualization on the operating system (OS) level — also known as containerization,” Trend Micro researchers said in an Oct. 25 blog post. “The Docker APIs, in particular, allow remote users to control Docker images like a local Docker client does. Opening the API port for external access is not recommended, as it can allow hackers to abuse this misconfiguration for malicious activities.”

The attacks weren’t the result of the Docker engine being compromised or problems within Docker’s enterprise platform but instead were the result of misconfiguration set up at the administrator level.

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