Preventing Executive SIM-Swapping Attacks on Financial Accounts

Article summary: SIM-swapping attacks can turn control of an executive’s phone number into a path to sensitive business accounts. Stronger carrier protections and moving away from SMS verification on financial and other critical accounts can reduce that risk without making everyday access more difficult.

Your phone suddenly shows “No Service” in the middle of the workday. Calls stop coming through, texts disappear, and restarting the phone does nothing.

That loss of service could be the first sign of a SIM-swapping attack. A criminal has convinced your mobile carrier to move your phone number to a device they control, giving them access to calls and text messages, including security codes sent by SMS. From there, they may be able to reset passwords and take over email or financial accounts.

For business owners and employees with access to company finances, that can quickly become a serious business security problem.

In this post, we’ll explain how SIM-swapping attacks work, why executives and financial decision-makers can be attractive targets, and what businesses can do to reduce the risk.

How a SIM Swapping Attack Works

A SIM swap doesn’t involve hacking a phone directly. Instead, an attacker gathers enough personal details, often from social media or a company website’s “meet the team” page, to convince a mobile carrier’s support desk that they are the account holder.

Once the carrier transfers the number, the victim’s phone loses cellular service and incoming calls and texts are redirected to the attacker’s device instead.

From there, accounts that rely on SMS for verification or password resets may be at risk, including email, banking, and payroll accounts.

Why Executives and Financial Approvers Get Targeted

SIM-swapping attacks are often targeted rather than random. Criminals look for phone numbers tied to valuable accounts, making business owners, executives, and employees with access to company finances especially attractive targets.

Once an attacker controls the number, SMS verification can become a way into other accounts. The FBI warns that SIM swapping can allow criminals to defeat SMS-based authentication and reset passwords for email, cloud storage, and other services.

For a business, that can quickly become more than a stolen phone number. If an attacker gains access to an executive’s email or financial accounts, they may be able to impersonate that person, request payments, or target employees who are accustomed to acting on their instructions.

The Real Cost When It Works

A successful SIM swap can get expensive quickly. Thomson Reuters reports that the FBI investigated 1,075 SIM-swapping incidents in 2023, with losses approaching $50 million. In one case, a bank customer lost $38,000 after a fraudster took control of his phone number and intercepted authentication codes.

The phone number is only the starting point. The real cost comes from what an attacker does with that access, from unauthorized transfers to compromised accounts and the time spent getting everything back under control.

Locking Down Your Carrier Account

Carriers have added stronger protections against SIM swapping, and new federal rules are strengthening them further. In late 2023, the FCC adopted rules requiring wireless providers to use secure authentication before SIM changes and number transfers, notify customers about those requests, and offer an option to lock accounts against unauthorized transfers.

Those safeguards help, but businesses should not assume every available protection is already turned on. A few account-level changes can make an executive’s phone number much harder to hijack.

Turn on your carrier’s account protection

Check what protections your carrier offers against unauthorized SIM changes and number transfers. Look for features such as an account lock, number lock, or port-out protection, and enable them for executives and anyone with access to company finances. Protect the carrier account itself with a strong password and any additional PIN or passcode available.

Pay attention to account change alerts

Treat unexpected messages about SIM changes, number transfers, or other account activity as a warning sign. Make sure your carrier has current contact information, and if you receive an alert for a change you did not request, contact the carrier immediately through its official app, website, or customer service number.

Reducing What SMS Can Unlock

Even with carrier protections in place, the more valuable fix is reducing how much damage a stolen phone number can actually do.

• Move sensitive accounts away from SMS codes to an authenticator app or hardware security key, which can’t be redirected by a carrier-level SIM swap.
• Require callback verification, a call to a previously known number, before approving any wire transfer, even one that appears to come from the owner.
• Review which accounts still use a phone number as the password-reset method and change the recovery option where possible.

This comparison of MFA methods breaks down which authentication options actually hold up against this kind of attack, which matters as much for SIM swapping attack prevention as it does for ordinary phishing.

Protect the Accounts That Matter Most

Reducing the risk of SIM swapping does not require new phones or complicated security tools. Start by strengthening your carrier account protections and moving sensitive business accounts away from SMS verification wherever stronger authentication options are available.

Sound Computers can help identify where your executive and financial accounts still rely on text-message codes and recommend stronger ways to protect them

Ready to strengthen your account security? Contact Sound Computers to schedule a consultation. Call us at (860) 577-8060, reach us online, or email info@soundcomputers.net to learn more. 

Article FAQs

What is a SIM swapping attack?

A SIM-swapping attack happens when a criminal gets a mobile carrier to transfer a victim’s phone number to a device the criminal controls. Calls and text messages, including security codes sent by SMS, may then go to the attacker instead of the victim.

Why do SIM-swapping attacks target executives?

Business owners, executives, and financial approvers can be valuable targets because their phone numbers may be connected to sensitive email, financial, and other business accounts. Taking over the number can give an attacker another way to attempt password resets or intercept SMS verification codes.

Can a port-out PIN stop a SIM swap?

A port-out PIN or similar carrier protection can make an unauthorized transfer more difficult, but it should not be your only defense. Enable the strongest account protections your carrier offers and avoid SMS verification for sensitive accounts when more secure authentication methods are available.