The ads designed to drive business growth are being weaponized to steal credentials, distribute malware, and impersonate brands at scale.
There’s a cruel irony in how search advertising works today. Businesses pay premium rates to appear at the top of search results, trusting that visibility translates to customer acquisition. Meanwhile, attackers pay those same rates to occupy those same positions—not to sell products, but to steal credentials and distribute malware under the guise of trusted brands.
Google blocked 5.1 billion harmful ads in 2024 and suspended 39.2 million advertiser accounts for policy violations. The company permanently banned over 700,000 accounts specifically for AI-driven impersonation scams. Yet despite these enforcement efforts, malvertising surged 10% year-over-year, and security researchers continue to document campaigns that run for weeks before detection. The scale of the problem has grown so severe that over 70% of users now view online ads as untrustworthy.
The question isn’t whether your brand is being impersonated in search advertising. It’s whether you have the visibility to detect it before your customers become victims.
How search ad fraud operates
The mechanics of search ad fraud exploit fundamental features of advertising platforms rather than technical vulnerabilities. Attackers create ads that appear legitimate, bid on branded keywords, and direct clicks to infrastructure designed for theft.
The process typically begins with lookalike domains that closely mimic legitimate brand URLs. An attacker targeting graphic design software might register “frecadsolutions.com” instead of “freecad.org,” a difference most users won’t notice in the split second before clicking. Security researchers at Silent Push documented at least ten distinct malvertising campaigns running through Google Ads from just two IP addresses, targeting professionals searching for CAD and design software.
What makes these attacks particularly effective is their placement. Malicious ads often appear above organic search results, occupying the prime real estate users have been trained to trust. The ads themselves may use official logos, accurate product descriptions, and URLs that display as legitimate brand domains. For organizations monitoring their brand, these ads can be difficult to distinguish from legitimate partner advertising.
The Malwarebytes research team characterized a recent campaign targeting Google Ads users themselves as “the most egregious malvertising campaign” they had tracked. Attackers placed ads impersonating Google Ads, directing victims to phishing pages hosted on Google Sites, which allowed the malicious URLs to display the legitimate “ads.google.com” domain prefix. The campaign used fingerprinting, anti-bot detection, and CAPTCHA-style lures to evade security scanning while appearing completely authentic to human visitors.
The self-perpetuating attack cycle
The most sophisticated search ad fraud operates as a self-sustaining ecosystem. Attackers steal advertiser accounts, use those accounts to run fraudulent ads, and capture new victims whose accounts are then added to the pool.
This cycle explains why campaigns persist despite platform enforcement. When Google suspends one compromised account, the attackers simply activate another from their inventory. The hijacked accounts often have established spending histories and verification, allowing fraudulent ads to bypass the limited reach applied to new advertisers. Security researchers observed ads from “a regional airport” and other established businesses being used to distribute malware: accounts that would pass any cursory legitimacy check.
The credential harvesting extends beyond advertising platforms. Campaigns documented in late 2024 captured not just usernames and passwords but also two-factor authentication codes, enabling immediate account takeover before victims could respond. Once inside an account, attackers can review existing ads to understand targeting strategies, analyze customer data for additional phishing opportunities, and quietly redirect advertising spend to fraudulent campaigns.
This pattern mirrors what we’ve seen in AI-powered fraud more broadly: attackers industrializing operations that once required specialized skills. The barrier to entry has collapsed while the sophistication of attacks continues to increase.
The brand protection gap
For organizations whose brands are being impersonated in search advertising, the challenge is primarily one of visibility. Traditional brand monitoring focuses on trademark infringement and organic content. Paid advertising operates in a separate ecosystem with different detection requirements.
Malicious ads may appear only to users in specific geographic regions, on particular devices, or during certain time windows. Cloaking techniques show different content to security scanners than to legitimate users. The ephemeral nature of some campaigns—appearing for hours before rotating to new infrastructure—means that by the time a report reaches an abuse team, the specific ad may already be gone while the underlying campaign continues.
The damage compounds quickly. Forced redirects accounted for 81% of malicious ads in October 2024, automatically sending mobile users to phishing sites without requiring any interaction beyond clicking the ad. Unlike traditional phishing that depends on victims entering credentials, these attacks can install malware, capture session data, or initiate fraudulent transactions immediately upon redirect.
For more on how attackers hide malicious infrastructure, see our analysis of dynamic DNS abuse and URL shortener exploitation.
What security leaders should consider
The complexity of search ad fraud requires coordinated response across security, marketing, and legal functions. Several considerations can guide that coordination.
Continuous ad monitoring across major search platforms detects brand impersonation in paid placements. This requires capabilities beyond traditional brand monitoring since the content exists in advertising ecosystems rather than indexed web pages.
Trademark registration with ad platforms provides expedited takedown paths when impersonation is detected. Google and Microsoft both offer brand protection programs that can accelerate response times.
Customer communication establishes official channels and helps users recognize fraudulent advertising. When customers know that your organization never advertises certain types of promotions or never requests credentials via advertising links, they’re better equipped to identify impersonation attempts.
Rapid takedown capabilities minimize the window of victim exposure. Given that half of phishing victims fall within the first hour of a campaign, response time directly correlates with customer protection.
The Bottom Line
Search advertising has become a vector for industrial-scale credential theft, malware distribution, and brand impersonation. The platforms’ enforcement efforts—billions of blocked ads, millions of suspended accounts—demonstrate both the scale of the problem and the limits of reactive defense.
Organizations that haven’t extended their brand protection to paid advertising are operating with a significant blind spot. The ads appearing above your legitimate search results may not be from your competitors. They may be from attackers wearing your brand as a disguise.
Key Takeaways
Google blocked 5.1 billion bad ads and suspended 39.2 million advertiser accounts in 2024. The company permanently banned over 700,000 accounts specifically for AI-driven impersonation scams.
Forced redirects dominated malvertising in 2024, accounting for 81% of malicious ads in peak months. These attacks automatically send users to phishing or malware sites without requiring any interaction beyond the initial ad click.
Attackers register lookalike domains, use official brand logos, and exploit platform features like Google Sites to display trusted URL prefixes. They also employ cloaking techniques that show different content to security scanners than to real users.
Attackers steal legitimate advertiser accounts and use them to run fraudulent ads, creating a self-perpetuating cycle. When one account is suspended, they activate another from their inventory of hijacked accounts.
Protection requires continuous monitoring of paid advertising across search platforms, trademark registration with ad platforms for expedited takedowns, clear customer communication about official channels, and rapid response capabilities when impersonation is detected.
