How the SolarWinds Hackers Bypassed Duo’s Multi-Factor Authentication
Schneier on Security
DECEMBER 15, 2020
This is interesting : Toward the end of the second incident that Volexity worked involving Dark Halo, the actor was observed accessing the e-mail account of a user via OWA. Logs from the Exchange server showed that the attacker provided username and password authentication like normal but were not challenged for a second factor through Duo.
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