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SUPERNOVA is an in-memory web shell written in .NET C#. It was discovered in November 2020 during the investigation of APT29's SolarWinds cyber operation but determined to be unrelated. Subsequent analysis suggests SUPERNOVA may have been used by the China-based threat group SPIRAL.(Citation: Guidepoint SUPERNOVA Dec 2020)(Citation: Unit42 SUPERNOVA Dec 2020)(Citation: SolarWinds Advisory Dec 2020)(Citation: CISA Supernova Jan 2021)(Citation: Microsoft Analyzing Solorigate Dec 2020)