Joseph O’Connor is the U.K. The U.K. national who was behind a hack of 2020 Twitter has been extradited back to the United States. He has pleaded guilty to several cybercrime crimes, according to the U.S. Attorney’s Office Southern District of New York.

“O’Connor’s sophisticated technological abilities were used for malicious purposes – he conducted a SIM swap attack in order to steal large amounts cryptocurrency, hacked Twitter, carried out computer intrusions, took over social media accounts and even cyberstalked two victims, one of whom was a minor,” said the SDNY.

During the hack of 2020 Twitter, several high-profile Twitter account were hijacked including CoinDesk and used to promote an elaborate bitcoin giveaway scam. The attackers were able to conceal scam warnings, including those from Binance CEO Changpeng Zhao. They also managed to amass approximately 11.3 BTC (103,960 USD) through the fraudulent activity.

Florida resident Graham Ivan Clark was arrested and tried in March 2021 as a juvenile offender. He was 17 years old at the time.

O’Connor, 23 years old, was also charged and pleaded guilty by the SDNY for his involvement in SIM-swapping attack targeting high-profile executives within the cryptocurrency industry. This resulted in the theft $794,000 worth of digital assets.

The SDNY did not name the company and only stated that it provided “wallet infrastructure” and “related software for cryptocurrency”. However, there are numerous examples of crypto companies being targeted using the same technique, , including BlockFi.

Victims have sued telecoms like AT&T and T-Mobile for the lack of security measures which allowed these attacks to occur.

O’Connor will be back in court for sentencing on June 23, 2009.

James Rubin is the editor.