The FBI, National Security Agency and Cybersecurity and Infrastructure Security Agency collaborated with the United Kingdom's National Cyber Security Centre to release a Joint Cybersecurity Advisory examining tactics, techniques, and procedures associated with Russian Foreign Intelligence Service (SVR). The advisory provides additional insights on SVR activity including exploitation activity following the SolarWinds Orion supply chain compromise.
CISA released a related document, Fact Sheet: Russian SVR Activities Related to SolarWinds Compromise, that summarizes three joint publications focused on SVR activities related to the SolarWinds Orion compromise.
SVR cyber operators appear to have reacted to prior reporting by changing their TTPs in an attempt to avoid further detection and remediation efforts by network defenders. Read more at CISA.