What You Need to Know About SMS Phishing Attacks

What is SMS Phishing?

Phishing is a type of online attack in which a cybercriminal impersonates a legitimate entity or authority and attempts to deceive their target into clicking on a malicious link or attachment. This can enable hackers to steal their victim's sensitive information or infect their device with malicious software.

While email-based phishing attacks have been prevalent for some time, attackers have increasingly adopted SMS (text message) as a delivery method in recent years. SMS phishing, also known as "smishing," is a type of phishing attack in which an attacker sends malicious messages and links to hundreds or even thousands of cell phone numbers to deceive the recipients into taking actions that are against their best interest.

For cryptocurrency holders, the primary intent of SMS phishing attacks is to gain access to the recipient's crypto wallet or account so that attackers can steal their funds. SMS phishing poses particular challenges in the cryptocurrency space for two key reasons:

• Cybercriminals have an ever-growing incentive to steal crypto assets due to their unprecedented growth in monetary value
• Cryptocurrency transactions are irreversible once the transaction has been confirmed and written onto the blockchain ledger

If you're invested in cryptocurrency or considering it, it is strongly recommended that you take the time to understand how to identify this common threat and what to do if you receive one of these messages.

How to Identify SMS Phishing

Phishing messages can be detected with high reliability by completing three simple checks:

The Sending Number. One of the first things to check is the phone number from which the message was sent. By performing a quick search online, you will often find that this phone number is associated with known scams — your first red flag. Legitimate organizations typically use recognizable phone numbers or official channels for communication.

The Message Content. Grammar mistakes are often a strong indicator that a message is likely a scam. Even if there are no obvious grammatical errors, examine the intent of the message carefully. Phishing messages frequently attempt to manipulate your emotions by either creating a sense of fear or excitement. If you receive a message that is emotionally triggering—whether positive or negative—it may be a phishing attempt and should raise immediate concern. Common emotional triggers include urgent account security warnings, unexpected prize notifications, or time-sensitive offers.

The Link. Always examine the link carefully before clicking. If the link does not contain the domain of a legitimate platform you recognize, it is almost certainly a phishing attempt. Pay special attention to slight variations in domain names, as attackers often use similar-looking domains to deceive users.

What to Do if You Receive an SMS Phishing Message

Now that you have the tools to detect SMS phishing messages, the next question is what to do if you receive one.

The most important action is simple: Do not click the link! This is the single most critical step in protecting yourself from SMS phishing attacks.

Beyond avoiding the malicious link, there are additional steps you can take:

Report to Your Mobile Carrier. Copy the message and send it to 7726, a short-code service established by major US-based cell phone carriers to help them detect and block malicious messages on their networks. By reporting the phishing message to 7726, you help mobile carriers identify and block these threats, protecting other users as well.

Report to the Platform. Take a screenshot of the message and report it to the security team of the platform being impersonated. If the message impersonates a major cryptocurrency platform, send the screenshot to their official security contact email. This enables their security team to investigate the phishing link and submit abuse reports to organizations that can help have the phishing site taken down.

As cryptocurrency continues to grow in popularity, cybercriminals will continue to innovate and attempt to discover new ways to gain access to users' investments. While security teams at major platforms work to keep users informed of new threats as they arise, it is equally important that you take an active role in protecting the security of your own account.

Additional Examples of SMS Phishing

Understanding real-world examples of SMS phishing can help you recognize these attacks more effectively. Here are several common scenarios:

Example 1: Suspicious Phone Number with Fear-Based Messaging

The phone number is largely unknown and does not appear in legitimate search results. The message contains grammar issues and attempts to invoke a fear response by claiming unauthorized account access. The link included in the message does not direct to the legitimate platform's official domain. Some attackers use Internationalized Domain Names (IDNs) in phishing attacks, employing special characters or accents that closely resemble legitimate domain names—for instance, using an accent mark on a letter to mimic a well-known platform's branding.

Example 2: Abnormal Number with Excitement-Based Messaging

The phone number is abnormally long and appears suspicious upon inspection. The message contains multiple grammar errors and attempts to invoke excitement by falsely indicating receipt of cryptocurrency. The link does not direct to the legitimate platform's official domain but instead to a fraudulent site designed to capture user credentials.

Example 3: Unknown Number with Reward Notification

The phone number is largely unknown and does not appear in search results for legitimate businesses. The message attempts to create excitement by suggesting the recipient has received cryptocurrency rewards or bonuses. The link is not from the legitimate platform's official domain, but instead from a spoofed or phishing domain designed to trick users into entering their login information.

These examples demonstrate the common patterns used in SMS phishing attacks. By remaining vigilant and applying the identification techniques outlined above, you can significantly reduce your risk of falling victim to these schemes. Remember: when in doubt, do not click the link, and always verify communications through official channels.

FAQ

What is SMS phishing and how does it differ from email phishing?

SMS phishing is a cyberattack using fraudulent text messages to steal personal information by impersonating trusted entities. Unlike email phishing which uses emails, SMS phishing exploits the SMS channel for higher response rates and urgency perception.

How to identify and prevent SMS phishing attacks? What are common warning signs?

Identify SMS phishing by suspicious links, urgent language, and requests for personal information. Red flags include messages claiming account verification needed, payment issues, or unusual activity alerts from unknown senders. Never click links or share credentials via SMS.

What tactics and social engineering methods are commonly used in SMS phishing attacks?

SMS phishing attackers impersonate trusted entities like banks or government agencies, creating urgency to trick victims into clicking malicious links or revealing sensitive information. They exploit psychological manipulation through urgent language and false authority to compromise cryptocurrency wallets and personal data.

If I accidentally clicked on a link in a phishing SMS, what should I do immediately?

Immediately change all important account passwords, disable potentially affected payment cards, and contact your financial institutions to report suspicious activity. Monitor your accounts closely for unauthorized transactions.

How can enterprises and individuals protect themselves from SMS phishing attacks?

Stay vigilant by avoiding unknown links and verifying sender identities. Enable two-factor authentication, use security software, and conduct regular security training. Never share sensitive information via SMS, and report suspicious messages immediately.

What are real examples of SMS phishing attacks in crypto? What consequences did they cause?

The 'Smishing Triad' case targeted users via fake postal service SMS messages, stealing financial credentials and payment information, causing significant financial losses to affected users and damaging their account security.