The iOS zero-click attacks that targeted iPhones of Kaspersky senior employees earlier this year, known as ‘Operation Triangulation’, focused heavily on stealth. The attacks used malicious iMessage attachments designed to exploit a zero-day vulnerability and deploy spyware. The threat actors implemented multiple techniques to avoid detection, including the use of validators in the infection chain, deleting traces of the attack, and having a microphone-recording module that could stop when the device’s screen was in use. This level of care taken by the threat actors highlights the importance of exercising stealth in advanced cyberattacks.