tl;dr: Adform, an ad network serving 1.5 billion daily ads, was compromised on July 27 when attackers injected malicious code into its ad delivery, replacing crypto wallet addresses in victims' clipboards every three seconds to redirect transfers to the attacker. The company disclosed the breach but hasn't revealed how it was compromised or how many users were affected, and is still investigating whether browsing data was exfiltrated. Ad blockers like uBlock Origin blocked Adform's domain entirely, preventing the malicious payload from loading.