Just days after a ransomware attack disrupted operations at Norwegian aluminium company Norsk Hydro, two U.S.-based chemical companies last Friday disclosed that they were affected by an unspecified network security incident that blocked access to certain IT systems and data.

Reports suggest the incidents could be the work of LockerGoga, the same malicious encryption program that infected Norsk Hydro on March 18.

Columbus, Ohio-based Hexion, which specializes in thermset resins, and Waterford, N.Y.-based MPM Holdings Inc. (aka Momentive), which deals in silicons and advanced materials, both issued press releases on March 22, acknowledging the attacks. Hexion and Momentive are controlled by the same public equity firm, Apollo Global Management.

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