The joint alert from the U.S. Department of Homeland Security and the Federal Bureau of Investigation said that "cyber actors of the North Korean government" had targeted the media, aerospace and financial sectors, as well as critical infrastructure, in the United States and globally.
North Korea has routinely denied involvement in cyber attacks against other countries. The North Korean mission to the United Nations was not immediately available for comment.
The alert said Hidden Cobra has compromised a range of victims since 2009 and that some intrusions had resulted in thefts of data while others were disruptive. The group's capabilities include denial of service attacks, which send reams of junk traffic to a server to knock it offline, keyloggers, remote access tools and several variants of malware, the alert said.
Hidden Cobra commonly targets systems that run older versions of Microsoft Corp operating systems that are no longer patched, the alert said.
North Korean hacking activity has grown increasingly hostile in recent years, according to Western officials and cyber security experts.
Tuesday's alert said Hidden Cobra's cyber attacks have been previously referred to by private sector experts as Lazarus Group and Guardians of the Peace, which have been linked to attacks such as the 2014 intrusion into Sony Corp's Sony Pictures Entertainment.
(Reporting by Dustin Volz in Washington and Jim Finkle in Toronto; Additional reporting by Michelle Nichols at the United Nations; Editing by Jonathan Oatis and Lisa Shumaker)
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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