GoKawiilMicrosoft finds spammers hijacking AI-targeted ASCII smuggling to dodge email filters
Microsoft says spammers have repurposed ASCII smuggling, a technique once used mainly to sneak hidden prompt-injection instructions into AI systems, to disguise spam keywords and slip past Office 365 filters. The company detected daily signature hits jump from about 21,000 to over 1.3 million in early February, reaching 2.5 million within days before tapering off by mid-May.