Smishing

One text message, time pressure and a link to a fake website are enough for a security incident to occur. Smishing takes advantage of the fact that we trust text messages more than emails and we read them on the fly, without the habit of checking the sender. The phone in your hand gives the illusion of a private, secure channel, and this reflex of trust is the greatest vulnerability here.

What is smishing?

Smishing (from SMS phishing) is a social engineering fraud carried out via SMS or instant messaging, in which the criminal impersonates a trusted institution to trick the victim into clicking a malicious link, downloading an application or providing confidential data. The name of the links is “SMS” and “phishing”.

Smishing belongs to the family of phishing attacks and differs from other types in terms of the delivery channel. In phishing, the medium is an email, in vishing a telephone call, and in quishing a QR code. Smishing uses a text message that goes straight to a private phone and is read almost immediately.

The common denominator is human manipulation, which is why all these techniques are tested together during social engineering tests. Smishing, however, is the most difficult to stop on the company’s end because it goes to a private phone that the security department usually does not control.

Smishing and phishing, vishing and quishing

Why is smishing so effective?

The effectiveness of smishing does not result from technical advancement, but from several features of the SMS channel itself:

• Higher trust than email. Text messages are still associated with contact from a bank, courier or friend, so the recipient is less likely to approach them with reserve.
• Reading on the go. The SMS is opened reflexively and immediately, without a moment to verify the sender or address, which favors acting on impulse.
• No mail-class filters. The phone does not analyze the content of the SMS in the same way as a company’s mail gateway analyzes email, so a malicious message usually arrives without any problems.
• Link without context. Short, abbreviated addresses in SMS do not show the real domain, and on a small screen it is harder to see that the website is fake.

How does a smishing attack work?

A smishing campaign usually follows a repeating pattern:

• Impersonating the sender. The criminal forges the sender’s name (spoofing), for example “InPost” or the name of the bank. The fake message often ends up in the same thread as the victim’s real text messages from a given company, which makes it even more credible.
• Message with pressure and a link. The content informs about an urgent matter: underpayment for the package, account blocking or overdue payment, and directs you to a link “to solve the problem”.
• False website. The link leads to a website that is confusingly similar to the website of a bank, courier or payment operator.
• Fraud or infection. The victim provides login or card details, makes a quick transfer or downloads an application that installs malware on the phone.

Smishing – examples of the most common scams

Smishing is set in situations that seem like ordinary everyday life. There are mainly four recurring motifs in Polish reality:

1. Parcel surcharge – SMS with a small underpayment, for example PLN 1.50, for a parcel allegedly held up at the sorting office. The low amount is intended to lull your vigilance, and the real target is the card details entered on the fake payment page.
2. Account or service block, i.e. information about hacking, account suspension or subscription expiration, with a link to immediate “unblocking”.
3. Demand for payment: an alleged fine, overdue tax or electricity bill based on fear of the consequences.
4. Promise of refund, for example an overpayment from the office or the National Health Fund, directing the victim to a phishing form.

The authentication mechanism can be even more clever when the fraudster impersonates the sender’s name (spoofing) and the forged SMS ends up in the same thread where the victim has real messages from the bank or courier

How to recognize smishing? Quick test

Before you click anything in an SMS, it’s worth asking yourself three questions: whether I expected this message, whether someone is putting me under time pressure, and where the link actually leads. An affirmative response to pressure and uncertainty about the address is reason enough to stop.

Specific signals that should raise suspicion include a shortened or strange address that does not match the institution’s domain, a request for login or card details, a request to install an application from outside the official store, and a sender name that matches a well-known company despite the disturbing content. The sender’s name itself is not proof because it can be easily forged.

How to protect your organization against smishing?

For a single user, the rule is simple: do not open links to the bank or payments directly from the SMS, just enter the address manually or use the application. Send the suspicious message free of charge to the number 8080 operated by CERT Polska, and if you have already provided your data, change your password immediately and notify the bank.

From the company’s perspective, the problem is more difficult because smishing bypasses infrastructure security and attacks employees’ private phones. What will work here is not another filter, but the preparation of people.

Training in realistic scenarios works best as it shows in numbers how many employees would click on a crafted SMS and allows you to train your stopping reflex. We test such a channel in Practical Anti-Phishing Training, where, in addition to email phishing and QR codes, we also prepare smishing simulations tailored to the industry and positions. You can watch the platform’s operation and audit reports live by scheduling a free demo.

FAQ – smishing

Smishing what is it in short?

This is a scam in which a criminal impersonates a trusted institution via text message or messenger to extort data or money. Most often, it uses a short message with a link and time pressure.

Smishing – how to defend yourself most effectively?

Do not click on links from the SMS, just enter the institution’s address yourself, and do not provide data under pressure. Report suspicious messages to 8080, and in your organization regularly train employees on simulations involving the SMS channel.

What to do if I clicked a link and provided data?

Immediately change your account and banking passwords, contact your bank to block your card or transactions, and in the event of a financial loss, notify the police. If you downloaded the application from the link, disconnect your phone from the network and have it checked.