In the pocket of every employee, manager, or individual lies a gateway that traditional firewalls cannot filter: the smartphone. With an open rate approaching 98% and an average reading time of less than 3 minutes, SMS has become the preferred attack channel for cybercriminals.
Smishing a contraction of SMS and phishing) exploits a fundamental bias: we place almost blind trust in messages received on our mobile phone.
Why SMS is the ultimate social engineering weapon
Unlike corporate email inboxes, which are protected by complex security gateways (SPF, DKIM, AI filters), the SMS channel has historically lacked native verification mechanisms.
- The illusion of proximity: The smartphone is an intimate object. A text message is perceived as an urgent and personal communication, instantly reducing the recipient's vigilance.
- The truncated ergonomics of mobile: On a smartphone screen, the URL display is reduced, masking the real structure of the malicious domain name.
- SMS Spoofing : Attackers manipulate the message header via mass messaging platforms. The phishing SMS then inserts itself into the same conversation thread as legitimate messages from your bank or usual carrier.
Anatomy of the most common SMS scams
| Types of attack | Psychological leverage | Attacker's objective |
| The fake delivery (bpost, DHL, Chronopost) | Curiosity and impatience ("Package blocked, pay €1.99 fee"). | Bank details stolen and subscription hidden. |
| Banking emergency / Fake advisor | Fear and panic ("Suspicious activity detected on your account"). | Capture of bank identifiers and validation of live transfers (Vishing). |
| The family emergency ("Hi Dad/Mom") | Empathy and protection ("I broke my phone, here's my new number"). | Immediate transfer via instant messaging (WhatsApp). |
| The fine or the public service (ANTAI, Health) | Fear of administrative sanctions ("unpaid fine before surcharge"). | Extortion of personal and financial data. |
The impacts: From data theft to enterprise compromise
Smishing does not only target personal bank accounts; it constitutes a major entry point into corporate networks.
- MFA (Two Factor) Bypass: A well-designed smishing SMS will trick the victim into entering their one-time password (OTP) on a mirror page, allowing the hacking of a Microsoft 365 or Google Workspace business account in real time.
- Mobile Malware Infection: Some links encourage users to download a supposed application update or package tracking software. In reality, a banking Trojan (e.g., Flubot, Anatsa) installs itself, steals the address book, and sends thousands of malicious SMS messages without the user's knowledge.
- SIM swapping hacking: By collecting enough personal data via smishing, the attacker can convince the telephone operator to transfer the victim's line to a new SIM card under their control.
How to neutralize the Smishing threat
Faced with a threat that bypasses technology to attack the human factor, the response must combine technical security and operational rigor.
- Ban OTP via SMS: For critical business access, replace two-factor authentication via SMS with authentication applications (TOTP) or, ideally, FIDO2 keys (YubiKey) which are completely immune to phishing.
- protectionMobile Threat Defense: Equip the professional mobile fleet with solutions capable of analyzing and blocking malicious web traffic directly on the device.
- Raising awareness of the golden rules:
- Never click on a link received by SMS for a financial or administrative transaction.
- Always go to the source by directly opening the official application or website from a browser.
- Report any attempts immediately to the national platforms (33700 in France, Safeonweb in Belgium).
Smishing demonstrates that computer security is not limited to the defense of servers: it is now played out at the fingertips, on a 6-inch screen.