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This is a partial list of notable hacker groups.
Internet activism, hacktivism, or hactivism, is the use of computer-based techniques such as hacking as a form of civil disobedience to promote a political agenda or social change. With roots in hacker culture and hacker ethics, its ends are often related to free speech, human rights, or freedom of information movements.
The Internet has a long history of turbulent relations, major maliciously designed disruptions, and other conflicts. This is a list of known and documented Internet, Usenet, virtual community and World Wide Web related conflicts, and of conflicts that touch on both offline and online worlds with possibly wider reaching implications.
Jeremy Hammond, alias sup_g, is an American anarchist activist and former computer hacker from Chicago. He founded the computer security training website HackThisSite in 2003. He was first imprisoned over the Protest Warrior hack in 2005 and was later convicted of computer fraud in 2013 for hacking the private intelligence firm Stratfor and releasing data to WikiLeaks, and sentenced to 10 years in prison.
Underground: Tales of Hacking, Madness and Obsession on the Electronic Frontier is a 1997 book by Suelette Dreyfus, researched by Julian Assange. It describes the exploits of a group of Australian, American, and British black hat hackers during the late 1980s and early 1990s, among them Assange himself.
Anonymous is a decentralized international activist and hacktivist collective and movement primarily known for its various cyberattacks against several governments, government institutions and government agencies, corporations and the Church of Scientology.
Operation Payback was a coordinated, decentralized group of attacks on high-profile opponents of Internet piracy by Internet activists using the "Anonymous" moniker. Operation Payback started as retaliation to distributed denial of service (DDoS) attacks on torrent sites; piracy proponents then decided to launch DDoS attacks on piracy opponents. The initial reaction snowballed into a wave of attacks on major pro-copyright and anti-piracy organizations, law firms, and individuals. The Motion Picture Association of America, the Pirate Party UK and United States Pirate Party criticised the attacks.
The Jester is a self-identified grey hat hacktivist. He claims to be responsible for attacks on WikiLeaks and Islamist websites. He claims to be acting out of American patriotism.
HBGary is a subsidiary company of ManTech International, focused on technology security. In the past, two distinct but affiliated firms had carried the HBGary name: HBGary Federal, which sold its products to the US Government, and HBGary, Inc. Its other clients included information assurance companies, computer emergency response teams, and computer forensic investigators. On 29 February 2012, HBGary, Inc. announced it had been acquired by IT services firm ManTech International. At the same time, HBGary Federal was reported to be closed.
LulzSec was a black hat computer hacking group that claimed responsibility for several high profile attacks, including the compromise of user accounts from PlayStation Network in 2011. The group also claimed responsibility for taking the CIA website offline. Some security professionals have commented that LulzSec has drawn attention to insecure systems and the dangers of password reuse. It has gained attention due to its high profile targets and the sarcastic messages it has posted in the aftermath of its attacks. One of the founders of LulzSec was computer security specialist Hector Monsegur, who used the online moniker Sabu. He later helped law enforcement track down other members of the organization as part of a plea deal. At least four associates of LulzSec were arrested in March 2012 as part of this investigation. Prior, British authorities had announced the arrests of two teenagers they alleged were LulzSec members, going by the pseudonyms T-flow and Topiary.
Teamp0ison was a computer security research group consisting of 3 to 5 core members. The group gained notoriety in 2011/2012 for its blackhat hacking activities, which included attacks on the United Nations, NASA, NATO, Facebook, Minecraft Pocket Edition Forums, and several other large corporations and government entities. TeaMp0isoN disbanded in 2012 following the arrests of some of its core members, "TriCk", and "MLT".
Anonymous is a decentralized virtual community. They are commonly referred to as an internet-based collective of hacktivists whose goals, like its organization, are decentralized. Anonymous seeks mass awareness and revolution against what the organization perceives as corrupt entities, while attempting to maintain anonymity. Anonymous has had a hacktivist impact. This is a timeline of activities reported to be carried out by the group.
We Are Legion: The Story of the Hacktivists is a 2012 documentary film about the workings and beliefs of the self-described "hacktivist" collective, Anonymous.
Ryan Ackroyd, a.k.a.Kayla and also lolspoon, is a former black hat hacker who was one of the six core members of the computer hacking group "LulzSec" during its 50-day spree of attacks from 6 May 2011 until 26 June 2011. Throughout the time, Ackroyd posed as a female hacker named "Kayla" and was responsible for the penetration of multiple military and government domains and many high profile intrusions into the networks of Gawker in December 2010, HBGaryFederal in 2011, PBS, Sony, Infragard Atlanta, Fox Entertainment and others. He eventually served 30 months in prison for his hacking activities.
On October 21, 2016, three consecutive distributed denial-of-service attacks were launched against the Domain Name System (DNS) provider Dyn. The attack caused major Internet platforms and services to be unavailable to large swathes of users in Europe and North America. The groups Anonymous and New World Hackers claimed responsibility for the attack, but scant evidence was provided.
Ghost Squad Hackers ("GSH") is a hacktivist group responsible for several cyber attacks. Former targets of the group include central banks, Fox News, CNN, the United States Armed Forces and the government of Israel. The group is led by a de facto leader known as s1ege, and selects targets primarily for political reasons. The group forms a part of the hacktivist group Anonymous.
Hack Forums is an Internet forum dedicated to discussions related to hacker culture and computer security. The website ranks as the number one website in the "Hacking" category in terms of web-traffic by the analysis company Alexa Internet. The website has been widely reported as facilitating online criminal activity, such as the case of Zachary Shames, who was arrested for selling keylogging software on Hack Forums in 2013 which was used to steal personal information.
Distributed Denial of Secrets, abbreviated DDoSecrets, is a non-profit whistleblower site founded in 2018 for news leaks. The site is a frequent source for other news outlets and has worked on investigations including Cyprus Confidential with other media organizations. In December 2023, the organization said it had published over 100 million files from 59 countries.
Emma Best is an American investigative reporter and whistleblower. They gained national attention for their work with WikiLeaks and activist Julian Assange. Best is known for prolific filing of Freedom of Information Act (FOIA) requests on behalf of MuckRock and co-founding the whistleblower site Distributed Denial of Secrets (DDoSecrets).
Anonymous, a decentralized international activist and hacktivist collective, has conducted numerous cyber-operations against Russia since February 2022 when the Russian invasion of Ukraine began.
Assange's youthful hacker name was Mendax ('lying'), allegedly from Horace's phrase 'splendide mendax,' or 'nobly lying'.