Authorities in Pakistan have arrested 21 individuals linked to the “Heartsender” malware service, which facilitated spam and cybercrime for over a decade, resulting in extensive financial losses. The operation, which targeted various internet companies, was identified by KrebsOnSecurity in 2021, and included notorious figures like Rameez Shahzad, the alleged ringleader. The arrests follow a series of raids conducted by the National Cyber Crime Investigation Agency amid ongoing investigations into transnational organized crime.