How did SolarWind Hackers evade Detection?

A report from the Microsoft 365 Defender Team, Microsoft Threat Intelligence Center (MSTIC), and Microsoft Cyber Defence Operations Center (CDOC) details how the SolarWinds hackers managed to remain undetected for so long. The report discloses new details including the steps and tools used to deploy the custom Cobalt Strike loaders (Teardrop, Raindrop, etc.) after the hackers dropped the Solorigate (Sunburst) DLL backdoor.

It was revealed that: “During our in-depth analysis of the attacker’s tactics, techniques, and procedures (TTPs) seen through the lens of Microsoft 365 Defender’s rich telemetry, we observed a few techniques that are worth disclosing to help other defenders better respond to this incident and use hunting tools like Microsoft 365 Defender advanced hunting or Azure Sentinel queries to search for potential traces of past activity.”

Following the report, Microsoft stated that it is “actively working with MITRE to make sure that any novel technique emerging from this incident is documented in future updates of the ATT&CK framework.”


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