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.
[9] In January 2011, unauthorized status updates were posted on Mark Zuckerberg and French President Nicolas Sarkozy's accounts on social-networking site Facebook.
Members of Facebook's security team said after being contacted on the matter by The Daily Beast, they had found no evidence of malicious activity in their logs.
[10] In June 2011, the group published what appeared to be the address book and other private data of former British Prime Minister Tony Blair on Pastebin.
[11] TeaMp0isoN responded to this, commenting "Blairs sheep are lying about how we got the info, we got into the webmail server via a private exploit & we wiped the logs so Good luck".
[15] In November 2011, TeaMp0isoN released a list of email addresses and passwords that were reportedly obtained via an SQL injection vulnerability in the United Kingdom's Ministry of Defence.
[22][23] TeaMp0isoN then went on to deface several sites in support of OpCensorThis, the most significant being the United Nations Development Programme, and the British tabloid newspaper, the Daily Mail.
[35] In April 2012, TeaMp0isoN hacked the United Nations again, this time targeting the UN's World Health Organization and leaking a list of usernames and hashed passwords, including administrator credentials.
Posting from their official Twitter account, they have identified and disclosed vulnerabilities in Google, Amazon, eBay, Harvard University, NOAA, Comcast, Time Warner Cable, Western Union, the United Nations, the London Stock Exchange, Autodesk and several other large systems.
[40] Also at this time, TeaMp0isoN identified a zero-day SQL Injection vulnerability, resulting in many sites being compromised, including Crime Stoppers in Waterloo, Ontario, Peel and other Canadian cities and districts.
[41] In May 2015, TeaMp0isoN member "KMS" targeted the Minecraft Pocket Edition Forum, seemingly infiltrating their database and leaking a list of over 16,000 usernames and passwords.
[44] TeaMp0isoN member "TriCk" is believed to be Junaid Hussain, a black hat hacker who was arrested for doxing Tony Blair's personal information.
Hussain has also been suspected of cooperating with other ISIL members to unmask individuals who report to rebel media groups, and doxing U.S. soldiers and their families.