Short definition: A cyber-attack where malicious advertisements are delivered through legitimate ad networks to infect users or redirect traffic.
1 min read
What It Is
Malvertising injects harmful scripts into online ads distributed across trusted websites. Users can be compromised simply by loading a page, as the malicious code may trigger silent redirects, exploit kits, or drive-by downloads without any clicks.
Why It Matters
Because ads are syndicated widely, a single compromised campaign can reach millions of users within hours. Malvertising can cause brand damage, traffic hijacking, malware deployment, and major operational disruption for both end-users and site owners.
How to Reduce Risk
- Use reputable ad networks and scanning tools
- Block or restrict third-party scripts
- Keep browsers and plugins updated
- Monitor for unexpected redirects or traffic anomalies
Related Terms
- Drive-By Download
- Supply Chain Attack
- Malware
External Resources
- Europol: Malvertising Threat Landscape — https://www.europol.europa.eu