What Is Malvertising? How Fake Ads Can Harm Your Business Ever clicked on an online ad without thinking twice? What if that ad wasn’t safe? Cybercriminals are using a tactic called malvertising (short for “malicious advertising”) to spread malware, steal data, and trick users into
What Is Malvertising? How Fake Ads Can Harm Your Business
Ever clicked on an online ad without thinking twice? What if that ad wasn't safe?
Cybercriminals are using a tactic called malvertising (short for "malicious advertising") to spread malware, steal data, and trick users into handing over money. And the worst part? You don't even need to click the ad to be at risk-just loading a webpage with a malicious ad can compromise your device.
So, how does malvertising work? And more importantly, how can you protect your business from fake ads?
"42% increase in malvertising campaigns in the US during 2024"
Malvertising rose 10% globally, with over 70% of users now viewing online ads as untrustworthy.
"81% of malicious ads used forced redirects in October 2024"
Unlike traditional scams requiring clicks, forced redirects automatically send visitors to malicious sites.
"1 in 40 UK ad impressions flagged as malicious in 2025"
Compared to 1 in 160 in the US. UK has become a global hotspot for malvertising.
"Nearly 1 million devices compromised in early 2025 malvertising campaign"
Campaign redirected users from illegal streaming sites to GitHub-hosted malware.
How Does Malvertising Work?
Malvertising works by injecting malicious code into legitimate-looking ads, which then appear on trusted websites. These ads can:
- Trick users into downloading malware disguised as software updates
- Redirect users to fake websites to steal login details
- Exploit browser vulnerabilities to install malware without a click
The ads often impersonate trusted brands, making them difficult to spot. But once they infect your system, they can steal sensitive data, lock files with ransomware, or install spyware to monitor activity.
What Are the Most Common Malvertising Attacks?
There are three main types to watch out for.
1. What Is Scam Malvertising?
Scam malvertising creates fake security alerts, claiming your device is infected. It urges you to call a support number, where scammers trick you into installing software that gives them control over your system. They then demand payment to "fix" the issue-when in reality, there was no problem to begin with.
2. What Is Fake Installer Malvertising?
Fake installer malvertising leads users to cloned versions of trusted websites. You think you're downloading software from a legitimate source, but instead, you're installing malware-often ransomware or spyware.
3. What Is Drive-By Download Malvertising?
This is one of the most dangerous types of malvertising because you don't even need to click the ad to be infected. If your browser is outdated, a malicious ad can exploit security flaws and install malware automatically.
How to Protect Your Business from Malvertising
Cybercriminals count on people clicking without thinking. The good news? With the right precautions, you can reduce the risk of attacks.
1. Question Before You Click
If an ad claims your computer is infected, your account is compromised, or you need to take urgent action-pause. Legitimate companies don't use pop-ups to warn you about security threats.
2. Check the Link First
Before clicking on any ad or link, hover over it to see the destination URL. If it looks odd, contains typos, or doesn't match the official domain, avoid it.
3. Keep Your Software Updated
Outdated browsers and security software make it easier for malvertising to work. Regular updates patch vulnerabilities and reduce the risk of drive-by downloads.
4. Use an Ad Blocker
A high-quality ad blocker prevents malicious ads from even appearing, reducing the chance of accidental exposure.
5. Train Your Team
Your employees are the first line of defence against cyber threats. Equip them with cybersecurity awareness trainingto help them spot and avoid malvertising scams.
6. Strengthen Your Security Measures
Consider using advanced cybersecurity solutions, such as DNS filtering and endpoint protection, to add an extra layer of defence against malicious content.
Is Your Business Safe from Malvertising?
Malicious ads is designed to look harmless but act dangerously. By staying cautious, keeping software up to date, and educating your team, you can protect your business from online threats.
Don't leave your business vulnerable to malvertising and other cyber threats.
Get in touch today to find out if your systems are at risk.
Let us help you secure your business and keep your team safe from malicious online attacks.
