Microsoft experts continue to investigate the SolarWinds attack and spotted 3 new strains of malware used as second-stage payloads. Microsoft announced the discovery of three new malware strains tracked as GoldMax, Sibot, and GoldFinder. The three pieces of malware were by the threat actors to maintain persistence and perform malicious actions in very targeted attacks. Microsoft provided details about the malware and the alerts provided by its security solution when detecting behavior associated with a wide range of attacks, including the NOBELIUMs activity.”]
Source: https://securityaffairs.co/wordpress/115311/malware/microsoft-solarwinds-malware.html