The Zero Group is a hacker group that is known for conducting cyber attacks against government and corporate websites. The group has claimed responsibility for a number of high-profile hacks, including the defacement of the website of the Central Intelligence Agency (CIA) in 2013 and the cyber attack on the Sony Pictures Entertainment website in 2014.
Very little is known about the members of the Zero Group, and it is not clear who is behind the group or where it is based. The group is known for using sophisticated hacking techniques and tools, and it has been described as a "professional" and "well-organized" hacker group.
The Zero Group has been the subject of controversy and has faced legal action in various countries for its activities. It is not clear how active the group is at present, or whether it is still in operation.