What is Sim Swapping?
SIM swapping typically begins with social engineering of carrier customer service representatives, using personal information gathered from data breaches, social media, or dark web marketplaces to pass identity verification. In more sophisticated operations, attackers bribe or recruit carrier employees (insiders), or exploit carrier account management portals directly. Once the number is transferred, the attacker receives all calls and texts intended for the victim, including the SMS one-time passwords that many organizations still use as a second authentication factor. The technique has been implicated in high-profile cryptocurrency thefts, corporate account takeovers, and the compromise of social media accounts belonging to public figures. The FBI reported SIM swapping complaints resulting in more than $68 million in losses in 2024 alone, and prosecutions against SIM-swapping rings have increased as law enforcement agencies develop specialized investigative capabilities. Some carriers now offer SIM-lock or port-freeze features, but adoption remains inconsistent and the technique continues to be effective against organizations and individuals relying on SMS-based MFA.
Business Impact
SIM swapping defeats SMS-based two-factor authentication entirely, turning a security control into an attack vector. Organizations that rely on SMS for customer authentication, password resets, or transaction verification face direct exposure. Financial services companies are the primary targets because SIM swaps enable real-time interception of transaction authorization codes. For brands, the downstream impersonation risk compounds: attackers who control a victim’s phone number can impersonate them in communications, reset passwords on associated accounts, and initiate transactions that appear to originate from the legitimate account holder.
Allure Security's Approach
Allure Security monitors for the credential exposure and identity data aggregation that precedes SIM swapping attacks. Dark web monitoring surfaces stolen personal information, including the phone account details and identity documents that attackers use to execute carrier social engineering. By detecting when customer or employee identity data appears in criminal marketplaces, Allure provides the early warning that enables organizations to implement protective measures before a SIM swap is attempted.