Since 2011 a group of attackers has been targeting companies that operate industrial control systems with a backdoor program called BlackEnergy.

“Multiple companies working with ICS-CERT have identified the malware on Internet-connected human-machine interfaces (HMIs),” the Industrial Control Systems Cyber Emergency Response Team (ICS-CERT), a division of the U.S. Department of Homeland Security, said in a security advisory Tuesday.

HMIs are software applications that provide a graphical user interface for monitoring and interacting with industrial machinery. They are a component of SCADA (supervisory control and data acquisition) systems that are used in industrial environments.

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