Microsoft released details on later-stage malware the company says was used by the group behind the SolarWinds espionage campaign. (Microsoft)

Microsoft released details Thursday on later-stage malware the company says was used by the group behind the SolarWinds espionage campaign that breached several government agencies and private firms, including Microsoft and FireEye.

A coordinated blog from FireEye provided a separate deep dive on one of the malware strains in the Microsoft post, but the firm was less confident about attributing it to the SolarWinds campaign. According to its blog, FireEye obtained a sample from a malware repository.

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