How MFA Fatigue Attack Works in 2024

Receiving unexpected texts asking you to approve something you didn't initiate? You could be facing an MFA fatigue attack. This modern cybersecurity headache involves hackers bombarding you with authentication requests. Their hope? You'll get so annoyed you'll hit 'approve' just to stop it.

If you suspect you might be targeted, don't worry. In this blog, we'll dive deep into MFA fatigue attack intricacies. We'll explore how it works, what makes you an easy target, and the best MFA fatigue attack prevention tips. We'll also discuss whether using an MFA is still safe in 2024. Are you ready to get started? Continue to read below. 

What is MFA (multi-factor authentication)?

MFA stands for Multi-Factor Authentication, which is a security system that requires more than one form of identification from you before letting you access your account. This way, even if someone has your password, they still need that second code to get in.

It's like having a second lock on your door. You might use MFA every day without realising it. Banks often use it for online transactions, and social media platforms do, too, to keep accounts safe. By combining something you know, like a password, with something you have, like your phone, MFA makes your digital life much safer.

How is MFA vulnerable? 

When MFA becomes vulnerable, it's often not the technology itself that is at fault but how we use it. Let's break down the habits and actions that weaken MFA's security shield:

• Reusing verification codes: If you use the same code across different services, you're asking for trouble. Each code should be a one-hit wonder, used once and then forgotten.

• Sharing security details: Even if you trust someone, sharing your MFA codes or devices can expose you to risks. Keep your security info to yourself.

• Ignoring software updates: Those annoying update notifications for your authentication apps? They're actually patching security holes. Skipping updates might leave you vulnerable.

• Falling for phishing scams: Hackers are clever, often tricking people into giving away their MFA info through fake emails or texts. Always double-check before clicking or sharing.

• Using unsecured networks: Public Wi-Fi can be a hacker's playground. If you're entering MFA details on a public network, you might as well be shouting them out loud.

• Not locking devices: Your phone or computer is a goldmine of access. Not using a password or biometric lock? Then your MFA is as good as compromised.

In essence, MFA's effectiveness is heavily reliant on how securely you handle your authentication methods. By tightening up these areas, you'll ensure that MFA continues to serve as a robust barrier against unauthorised access to your digital life.

What is an MFA fatigue attack? 

If you're not careful with MFA, you could be targeted by an MFA fatigue attack, also known as MFA bombing. This happens when hackers flood your device with constant MFA requests for logins you didn't start. They're betting on you getting so annoyed or confused that you'll approve a request to make them stop. 

Just one slip, and they have access. It's a simple but effective way to break through your defences, relying on your frustration rather than sophisticated hacking techniques. 

How do MFA fatigue attacks work

An MFA fatigue attack starts when hackers attempt to log into your accounts. They might already have your username and password, maybe from a previous breach. What they need now is the second factor of credentials, often a code sent to your phone. 

Here’s where the attack takes shape. Instead of trying to guess this code, attackers send MFA requests. If they send enough requests, they hope you’ll approve one just to stop the annoyance.

Imagine getting back-to-back notifications asking you to confirm attempts to access your account. It's late, you're tired, and in a moment of frustration, you hit 'approve' to make them stop. That’s all it takes. The hacker gains access the moment you approve one of these requests.

This scenario is particularly relevant in the UK, where many are known to work long hours. A study highlighted by The Independent shows that one in six office workers spends over 11 hours a week working outside the office on tasks like checking emails and making calls.

This workaholic culture could possibly make British workers prime targets for MFA fatigue attacks. The constant shift between work and personal life blurs, increasing the chances of a fatigued approval of malicious MFA requests.

Signs you're experiencing MFA bombing or other identity-based attacks

Worried that you might be experiencing an MFA fatigue attack? Here are the signs to look for: 

Unexpected MFA requests

The most glaring sign is receiving multiple MFA prompts without attempting to log in. These aren't random; they're targeted attempts by hackers trying to wear you down until you accidentally approve one.

Increased phishing emails or messages

An uptick in phishing attempts often precedes or accompanies an MFA fatigue attack. Hackers might try to snag your login details to pair with the MFA approvals they're seeking.

Account lockouts

If you find your accounts locked out without reason, it's a potential sign attackers have been trying to access your account. Hackers might be triggering security protocols that lock your account after too many failed login attempts.

Suspicious activity on your accounts

Should you notice unfamiliar actions on your accounts that you didn’t authorise, like password change requests or unknown devices attempting access, it's time to take action.

Reports from contacts

Sometimes, the first sign of trouble comes from your contacts. If they receive strange messages or requests from your accounts, it could mean someone else has gained access. It’s now time to read the best MFA fatigue attack prevention tips. 

MFA fatigue attack examples: Why are you being attacked? 

Ever found yourself puzzled by a barrage of MFA push notifications asking you to approve login attempts you never made? If so, you're not alone. You might be the target of MFA hackers. Let's delve into why you're on their radar.

Your data's value

Hackers target individuals with access to valuable information and could sell it to the dark web. Whether it's financial data, personal records, or confidential company intel, your digital assets are gold mines. The more precious your data, the more attractive you are to these digital hackers.

Weak passwords or being passwordless

It sounds simple, but weak passwords are akin to leaving your front door unlocked. If your password is easily guessable, has been exposed in a breach, or you have no password at all, attackers only need to bypass one more hurdle— the MFA request. And they're banking on you to let them in.

Public Wi-Fi use

Using public Wi-Fi without a VPN is like having a private conversation in a crowded room. Attackers lurking on the same network can intercept data and launch MFA requests. Before you know it, you might inadvertently grant them access.

Outdated software

Failing to update your software is akin to ignoring a weak spot in your armour. Outdated applications, especially those related to security, give hackers a playground to exploit vulnerabilities, making MFA fatigue attacks even more feasible.

Social engineering tactics

Hackers have become adept at manipulating users through phishing emails or fake security alerts. These tactics aim to create a sense of urgency, prompting you to act hastily and approve malicious MFA requests.

The insider threat

Sometimes, the danger lies within. Disgruntled employees or those with malicious intent can misuse their access to launch MFA attacks, knowing well the routines and potentially lax security practices of their colleagues.

How to prevent MFA fatigue attacks or data breaches

Protecting yourself from MFA fatigue attacks and data breaches requires a proactive approach to security. Here are the best MFA fatigue attack prevention tips in 2024: 

Tip #1 Strengthen your passwords

Use complex passwords that are hard to guess. Include a mix of letters, numbers, and symbols. Avoid using the same password across different accounts. Consider a password manager to keep track of your secure passwords.

Tip #2 Be wary of phishing attempts

Phishing emails or messages are often the first step in an MFA fatigue attack. Always verify the source before clicking on links or providing any information. If in doubt, contact the company directly through official channels.

Tip #3 Regularly update your software

Keeping your operating system, applications, and security software up to date is one of the best practices to prevent an MFA fatigue attack. These updates often contain patches for security vulnerabilities that attackers could exploit.

Tip #4 Use a VPN on public Wi-Fi

Among the common MFA fatigue attack prevention strategies is to avoid public Wi-Fi. If needed, though, you can opt to use a VPN to encrypt your internet connection, making it much harder for attackers to intercept your data or launch MFA requests.

Tip #5 Enable account lockout policies

Set up account lockout policies that temporarily lock your account after a few failed login attempts. This can prevent attackers from bombarding your account with MFA requests.

Tip #6 Educate yourself and your team

Awareness is key. Whether it’s just you or your entire organisation, make sure everyone knows the signs of an MFA fatigue attack and how to respond. Regular training sessions can be invaluable when someone requires the user to have their sign-in credentials. 

Tip #7 Monitor your accounts for suspicious activity

Keep an eye on your accounts for any unusual activity. This includes unexpected MFA requests, unknown devices accessing your account, or unfamiliar transactions.

Tip #8 Use advanced MFA options

Where possible, use advanced MFA options such as biometric verification or hardware security keys. These methods offer a higher level of security compared to SMS or email codes.

Tip #9 Implement least privilege access

Ensure that users have only the access they need to perform their tasks. This minimises the risk of stolen credentials and potential damage an attacker can do if they gain access to an account.

Tip #10 Have an incident response plan

Preparing for the worst is one of the best MFA fatigue attack prevention tips. Have a clear, step-by-step plan in place for responding to security incidents, including MFA fatigue attacks and data breaches. Knowing what to do in advance can significantly reduce the impact of an attack.

Is it still safe to use MFA?

Absolutely, MFA remains a cornerstone of modern cybersecurity practices. Despite the emergence of MFA fatigue attacks, the additional layer of security it provides is invaluable.

Consider this: a password alone, however strong, can be compromised. MFA introduces an extra hurdle for attackers. They must now possess something you have, like your phone or a hardware token, in addition to knowing your password. This significantly reduces the risk of unauthorised access. 

Being aware of phishing attempts, not reusing passwords, and monitoring for suspicious activity all play a part in keeping your accounts secure. In essence, MFA, when implemented and used correctly, remains an effective defence mechanism against a wide array of cyber threats.

Choose Serveline for unmatched cybersecurity

Facing sneaky cyber threats like MFA fatigue attacks? Serveline's got your back. We're not just any IT support crew; we're your digital defence heroes, ready to keep your data safe and sound. Since kicking off in 2009, Serveline has been all about giving top-notch, friendly IT support that stops cyber baddies in their tracks.

Whether you need help keeping your systems up-to-date or battling against hackers, we've got the tools and the know-how. And with a trusty track record with over 400 companies and a 94% SLA compliance rate, you know we mean business.

Step up your cybersecurity now! 

Ready to keep those cyber threats at bay? Serveline’s team is on standby, armed with the latest in cybersecurity smarts to make sure your business runs without a hitch.

Don't let hackers mess with your peace of mind. Contact us today at hello@serveline.co.uk and find out how we can tailor our expertise just for you.

Frequently asked questions

How does a social engineering attack compromise MFA security?

Social engineering attacks deceive individuals into revealing sensitive data, undermining MFA security by exploiting human factors rather than technical vulnerabilities. Attackers rely on manipulation to obtain access to accounts, bypassing the need for direct hacking.

What role does Microsoft Authenticator play in enhancing MFA applications?

Microsoft Authenticator enhances MFA applications by providing a secure method to authenticate login attempts. It uses number matching and notifications for users to verify access attempts, significantly reducing the risk of unauthorised account access.

How can threat actors use MFA spamming to conduct a cyberattack?

Threat actors use MFA spamming to overwhelm users with constant MFA notifications, hoping they'll accidentally approve a malicious login. This attack method exploits users' fatigue, making it easier for attackers to gain access to sensitive accounts.

Can passwordless authentication defend against brute force attacks?

Passwordless authentication offers a robust defence against brute force attacks by eliminating the use of traditional passwords. This approach relies on alternative authentication methods, such as biometrics or security keys, reducing the attack surface available to cybercriminals.

How do attackers exploit the MFA fatigue attack to work?

Attackers exploit the MFA fatigue attack by continuously sending MFA requests to the victim. This relentless approach is designed to tire the user into inadvertently approving access, thereby allowing the attacker to gain unauthorised access to the account.

What measures can be taken to ensure successful MFA against cyberattacks like MFA bombing or MFA spamming?

To ensure successful MFA against attacks like MFA bombing or MFA spamming, users should adopt advanced MFA security features, such as number matching and the use of applications like Microsoft Authenticator. Awareness of these cyberattack methods, reading the best MFA fatigue attack prevention tips, and regular monitoring of login activities are crucial.