List of hacker groups

A-G

• Anonymous, originating in 2003, Anonymous was created as a group for people who fought for the right to privacy.
• Anonymous Sudan, founded in 2023, a hacktivist group that claims to act against anti-Muslim activities, but allegedly is Russian backed and neither linked to Sudan nor Anonymous.
• Bangladesh Black Hat Hackers, founded in 2012.
• Chaos Computer Club, founded in 1981, it is Europe's largest association of hackers with 7,700 registered members.
• Conti, one of the most prolific ransomware groups of 2021, according to the FBI.
• Cozy Bear, a Russian hacker group believed to be associated with one or more intelligence agencies of Russia.
• Crime Boys, a Brazilian hacker group that performed website defacements in Governmental websites in protest against Fernando Henrique Cardoso government.
• Croatian Revolution Hackers, a now-defunct group of Croatian hackers credited with one of the largest attacks to have occurred in the Balkans.
• Cult of the Dead Cow, also known as cDc or cDc Communications, is a computer hacker and DIY media organization founded in 1984 in Lubbock, Texas.
• Cyber Partisans, a Belarusian hacktivist group that emerged in 2020, that performed attacks on the Belarusian government and governmental agencies.
• DarkSeoul, a cyber attack group believed to be North Korean-backed, known for destroying data and disrupting networks in South Korea from 2011-2013, targeting banks, media outlets, and government agencies using malware and wiper attacks to cause damage.
• DarkSide, a cybercriminal hacking group, believed to be based in Eastern Europe, that targets victims using ransomware and extortion.
• DCLeaks, claims to be a group of "American hacktivists who respect and appreciate freedom of speech, human rights and government of the people."
• Decocidio is an anonymous, autonomous collective of hacktivists who are part of Earth First!, a radical environmental protest organization, and adheres to Climate Justice Action.
• Derp, a hacker group that attacked several game sites in late 2013.
• Digital DawgPound The DDP was founded and named by StankDawg.
• Equation Group, suspected to be the offensive operations wing of the U.S. National Security Agency.
• Fancy Bear, a Russian cyberespionage group.
• Genocide2600, a group that gained notoriety for combating child pornography. Disbanded in 2009.
• Ghost Squad Hackers, or by the abbreviation "GSH" is a politically motivated hacking team established in 2015.
• Global kOS was a grey hat computer hacker group active from 1996 through 2000.
• globalHell was a group of hackers, composed of about 60 individuals. The group disbanded in 1999 when 12 members were prosecuted for computer intrusion and 30 for lesser offenses.
• Goatse Security (GoatSec) is a loose-knit, nine-person grey hat hacker group that specializes in uncovering security flaws.

H-R

• Hacktivist Nepal is a Nepali pro-monarchy hacktivist group that has endorsed the restoration of hindu state in Nepal.
• Hackweiser is an underground hacking group and hacking magazine founded in 1999.
• Hafnium Possibly with Chinese associations, responsible for the 2021 Microsoft Exchange Server data breach.
• Hive was a notorious ransomware as a service criminal organization that targeted mainly public institutions.
• Honker Union is a group known for hacktivism, mainly present in Mainland China, whose members launched a series of attacks on websites in the United States, mostly government-related sites.
• Indian Cyber Force is a hacktivist group that targets entities perceived to be against Indian interests. Notable incidents include cyberattacks against Canada, Maldives, Palestine, Pakistan.
• Insanity Zine Corp., active during the beginning of the 2000s in Brazil, it is known for their website defacements.
• International Subversives was a group of three hackers including Julian Assange under the name Mendax, supposedly taken from Horace's splendide mendax and two others, known as "Trax" and "Prime Suspect" who regularly hacked into corporations like Nortel and systems belonging to a "who's who of the U.S. military-industrial complex".
• Iranian Cyber Army unofficially confirmed to be connected to government.
• Islamic State Hacking Division, a Jihadist hacking group associated with the Islamic State.
• IT Army of Ukraine is a volunteer cyberwarfare organisation created amidst the 2022 Russian invasion of Ukraine.
• Killnet is a pro-Russian group that attacked several countries' government institutions and attempted to DDoS the 2022 Eurovision Song Contest website.
• L0pht, was a hacker collective active between 1992 and 2000 and located in the Boston, Massachusetts area.
• Lapsus$, a black-hat hacker group known for using extortion tactics. active since late 2021, allegedly dumping data from Microsoft, Samsung and Nvidia, and with members arrested in March 2022.
• Lazarus Group, with strong links to the North Korean government, involved in the Sony Pictures hack, the Bangladesh Bank robbery and the WannaCry ransomware attack.
• Legion of Doom; LOD was a hacker group active in the early 80s and mid-90s. Had noted rivalry with Masters of Deception.
• Legion Hacktivist Group, a hacking group that hijacked the Indian Yahoo server and hacked online news portals of India.
• Level Seven was a hacking group during the mid to late 1990s. Eventually dispersing in early 2000 when their nominal leader "vent" was raided by the FBI on February 25, 2000.
• Lizard Squad, known for their claims of distributed denial-of-service attacks primarily to disrupt gaming-related services. Currently broken up.
• Lords of Dharmaraja, an India based security hacking group which threatened in 2012 to release the source code of Symantec's product Norton Antivirus.
• LulzSec, a group of hackers originating and disbanding in 2011 that claimed to hack "for the lulz".
• Masters of Deception, MOD's initial membership grew from meetings on Loop-Around Test Lines in the early- to mid-1980s. Had noted rivalry with Legion of Doom.
• milw0rm is a group of "hacktivists" best known for penetrating the computers of the Bhabha Atomic Research Centre in Mumbai.
• NCPH is a Chinese hacker group based out of Zigong in Sichuan Province.
• Noisebridge, a hackerspace located in San Francisco which goes by the early definition of hacking and not security hacking.
• Noname057(16) a Russian speaking hacker group, attacks aligned with Russia's invasion in Ukraine
• OurMine, a hacker group of unknown origin that has compromised various websites and Twitter accounts as a way of advertising their "professional services".
• P.H.I.R.M., an early hacking group that was founded in the early 1980s.
• Phone Losers of America, an internet prank call community founded in 1994 as a phone phreaking and hacking group.
• Piratas Unidos Argentinos, the first hacking group from Argentina and one of the firsts from Latin America.
• Play, a ransomware extortion group, experts believe them to be from Russia.
• Prime Suspectz, a Brazilian hacker group active in the 2000s known for their website defacements, specially against Microsoft.
• Powerful Greek Army, is a Greek group of black-hat computer hackers founded in 2016.
• RedHack is a socialist hacker group based in Turkey, founded in 1997. They usually launch attacks against the Turkish government's websites and leak secret documents of the Turkish government.
• Rhysida group behind the 2023 British Library cyberattack and the Insomniac games dump using ransomware-as-a-service.
• Rocket Kitten or the Rocket Kitten Group is a hacker group thought to be linked to the Iranian government. Formed in 2010 by the hacker personas "Cair3x" and "HUrr!c4nE!".

S-Z

• Sandworm, also known as Unit 74455, a Russian cyber military unit of the GRU.
• The Shadow Brokers, originating in summer 2016. They published several leaks containing hacking tools, including several zero-day exploits of the National Security Agency.
• ShinyHunters is a hacker and extortion group that is said to be responsible for numerous data breaches in 2020 and 2021. The ShinyHunters cybercriminal group is also known as Scattered Spider/,,,, and . The ShinyHunters cybercriminal group once owned BreachForums following the arrest of the original founder. The group is still very active with their back to back massive destructive campaigns in 2024 and 2025 - their recent activities include Snowflake and Salesforce data-theft campaigns.
• Scattered Lapsus$ Hunters, a group active since around August 2025, apparently composed of members from Scattered Spider, Lapsus$ and ShinyHunters.
• SiegedSec, founded in 2022, a hacktivist group known for its anti-government and LGBTQ+-supportive stance, often targeting U.S. government agencies, law enforcement, and right-wing institutions.
• TeaMp0isoN is a group of black-hat computer hackers established in mid-2009.
• Telecomix, a hacktivist group mainly known for circumventing internet censorship during multiple political events.
• TeslaTeam is a group of black-hat computer hackers from Serbia established in 2010.
• TESO was a hacker group originating in Austria that was active primarily from 1998 to 2004
• The Unknowns is a group of white-hat hackers that exploited many high-profiled websites and became very active in 2012 when the group was founded and disbanded.
• Turla, one of the most sophisticated groups supporting the Russian government.
• UGNazi, a hacking group led by JoshTheGod, was founded in 2011. They are best known for several attacks on US government sites, leaking WHMC's database, DDoS attacks, and exposing personal information of celebrities and other high-profile figures on exposed.su.
• Vice Society, a Russian-speaking hacker group known for attacks on healthcare and education organizations
• Wizard Spider, a Russian / Ukrainian hacker group, suspected of being behind the Ireland Health Service Executive cyberattack, sometimes called Trickbot per the malware.
• Yemen Cyber Army, a pro-Yemeni hacker group that has claimed responsibility for the defacement of the London-based pro-Saudi Al-Hayat website in April 2015, as well as the exfiltration of data from the Saudi Arabia's Ministry of Foreign Affairs in May subsequently listed on WikiLeaks.
• YIPL/TAP - Youth International Party Line or Technological Assistance Program, was an early phone phreak organization and publication created in the 1970s by activists Abbie Hoffman.
• Xbox Underground, an international group responsible for hacking game developers, including Microsoft.
• UNC1151, believed to be based in Belarus.