The cyberespionage group Elfin, aka APT33, has launched a heavily targeted campaign against multiple organization in Saudi Arabia and the United States.

Researchers said the most recent targets include major corporations and despite 42 percent of observed attacks focusing heavily on Saudi Arabia. The U.S. has also been an area of interest for the group with 18 organizations, including a number of Fortune 500 companies, being hit over the past three years, according to a March 27 Symantec blog post.

U.S.-based targets have been against firms in the engineering, chemical, research, energy consultancy, finance, IT and healthcare sectors with some organizations being targeted for mounting supply chain attacks, researchers said in the report.

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