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https://www.microsoft.com/security/blog/2021/01/20/deep-dive-into-the-solorigate-second-stage-activation-from-sunburst-to-teardrop-and-raindrop/

Deep dive into the Solorigate second-stage activation: From SUNBURST to TEARDROP and Raindrop - Microsoft Security Our continued investigation into the Solorigate attack has uncovered new details about the handover from the Solorigate DLL backdoor (SUNBURST) to the Cobalt Strike loader (TEARDROP, Raindrop, and others).

More on the SolarWinds code compromise....

cyber.dhs.gov - Emergency Directive 21-01 A site for cybersecurity directives and implementation guidance, from the Cybersecurity and Infrastructure Security Agency.