The hacktivists, which describe themselves as made up of "gay furry hackers," usually target government orgs whose policies they disagrees with, and have a flare for political publicity stunts, also posted a link to the purported stolen files on their Telegram channel.
"The astonishing siegedsec hackers have struck NATO once more!!1!!!," the crew wrote, bragging: "NATO: 0. Siegedsec: 2."
The team is referring to its earlier NATO intrusion in July, during which it claimed it swiped information belonging to 31 nations and leaked 845MB of data from the alliance's the Communities of Interest (COI) Cooperation Portal.