https://www.reuters.com/article/us-global-cyber-usa-solarwinds/experts-who-wrestled-with-solarwinds-hackers-say-cleanup-could-take-months-or-longer-idUSKBN28Y1K3

Cybersecurity expert Steven Adair and his team were in the final stages of purging the hackers from a think tank's network earlier this year when a suspicious pattern in the log data caught their eye.