Social media giant Meta said on Friday that a hacking group linked to Iran was responsible for “malicious activity” on Whatsapp. Meta’s security team had blocked a “small cluster” of Whatsapp accounts posing as support agents for tech companies. Meta-owned companies include WhataApp, Facebook and Instagram. “Our investigation linked this activity to APT42, an Iranian threat actor known for its persistent phishing campaigns across the internet targeting political and diplomatic officials, and other public figures,” Meta said in a statement. The malicious activity originated in Iran and attempte…