Malvertising is the use of malicious online advertising to deliver scams, malware, redirects, or exploit content to users. It matters because attackers can abuse legitimate ad networks, placements, and user trust to spread harmful content at scale.
What is Malvertising?
Malvertising happens when attackers place or compromise online advertisements that lead users to malicious destinations, fake sites, exploit kits, or unwanted downloads. In some cases, users can be exposed simply by loading a page that serves the malicious ad content.
This attack path can affect otherwise legitimate websites because the malicious behavior comes through the advertising chain rather than from the site owner directly.
How Malvertising Commonly Harms Users
Common harms include redirecting users to scams, dropping malware, triggering exploit flows, harvesting credentials, or driving victims to fake update and support pages.
Malvertising vs. Drive-by Download
Malvertising is the delivery channel through malicious advertising. A drive-by download is one possible outcome where the user’s system is made to download or run malicious content through the browsing experience.
Frequently Asked Questions
Why is malvertising hard to detect?
It can be difficult because the ad delivery chain is complex, content can rotate quickly, and malicious behavior may only appear for selected users or conditions.
How can organizations reduce malvertising risk?
Secure browsing controls, browser patching, ad-blocking policies where appropriate, endpoint protection, DNS filtering, and user awareness all help reduce exposure.
