An Iran-affiliated hacking group named Handala has claimed responsibility for a cyberattack on the US medical technology company Stryker. The group announced on Wednesday that it stole 50 terabytes of data as retaliation for a military strike in Iran. According to AFP, Handala said the operation was carried out in response to an attack on Iran’s Minab School that killed at least 150 people and as a counter to ongoing cyberattacks on Tehran-backed groups.

Stryker confirmed that the incident caused a global network disruption in its Microsoft environment but reported no evidence of ransomware or malware, stating that the situation was under control. The group warned Israeli leaders and lobbyists that this marks the beginning of a new chapter in cyber warfare. Handala, named after a Palestinian symbol, has recently claimed attacks on companies in Israel and the Gulf region.

Cyber intelligence experts and reports cited in the source describe Handala as one of the most notorious Iran-linked hacking groups, known for data theft and spreading fear and uncertainty.