Hewlett-Packard disclosed to the SEC that they were compromised by APT29 a/k/a/ Cozy Bear a/k/a/ Midnight Blizzard
Microsoft believes they were compromised roughly November, 2023
https://counter.social/@ecksmc/111798302470277281
Hewlett-Packard believes they were compromised roughly May, 2023
"Based on our investigation, we now believe that the threat actor accessed and exfiltrated data beginning in May 2023 from a small percentage of HPE mailboxes belonging to individuals in our cybersecurity, go-to-market, business segments, and other functions," reads the SEC filing.
https://www.sec.gov/Archives/edgar/data/1645590/000164559024000009/hpe-20240119.htm
Follow
Midnight Blizzard: Guidance for responders on nation-state attack