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How do zero-click spyware attacks delivered through digital ads work?

Ads can carry malicious code that exploits browser flaws, so browsing alone can infect a device without installing anything, though a full zero-click ad chain isn't documented.

Updated 1 hour ago6 min readVersion 2
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Covers: This page explains the technical mechanisms of zero-click spyware delivered via digital ads, including exploit chains, ad-network abuse, and device infection without user interaction. It does not cover how to conduct such attacks or provide step-by-step instructions.

Also answers: How does zero-click spyware spread through ads? · Can digital ads install spyware without clicking? · What are zero-click ad-based spyware attacks? · How do malvertising zero-click exploits work?

The short answer

Evidence-backed AI-prepared starting map

Digital ads can carry malicious code that infects a device through a drive-by download — an infection that happens when a browser or its components are exploited, without the user choosing to install anything. Research on spyware infection vectors documents that spyware spreads by making use of browser vulnerabilities and that it has appeared in Internet…12

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At a glance

The picture in numbers

Live · updated just now

Reported 2024 trend, up from 26% the prior year

29%

29 in every 100

of malvertising incidents in 2024 involved misleading product offers2
Reported 2024 mobile threat detections

35%

35 in every 100

of mobile threat detections in 2024 were adware2
Reported 2024 trend

10%

10 in every 100

year-over-year rise in malvertising incidents in 20242
Study modelling how far malicious links flow and how long they survive
  • malicious105,642 items
  • benign169,178 items
Malicious and benign items analysed in Twitter malware study3

The evidence behind it

5 sources
  • Other studies and data5

When it was published

Newest from 2026

20052026
Sources on this page by kind and year
SourceKindYear
Taxonomy of Spyware and Empirical Study of Network Drive-By-DownloadsOther studies and data2005
Malvertising as a Vector for Cognitive Hacking: Integrating Technical and Psychological Defense Using the DISARM FrameworkOther studies and data2026
Disrupting drive-by download networks on TwitterOther studies and data2022
Emotions Behind Drive-by Download Propagation on TwitterOther studies and data2020
The Erosion of Cybersecurity Zero-Trust Principles Through Generative AI: A Survey on the Challenges and Future DirectionsOther studies and data2025

The community around it

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In brief

  1. The documented infection route is the drive-by download: spyware exploits browser vulnerabilities, so browsing alone can compromise a device without the user installing anything.1

    Evidence-backed
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  2. Malvertising embeds malicious code and psychological manipulation in ads; reported 2024 figures show incidents up 10% year-over-year, 29% involving misleading product offers, and adware at 35% of mobile threat detections.2

    Evidence-backed
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  3. Malicious campaigns spread through social and emotional dynamics — fear is associated with larger and longer-lived malicious information flows — and disruption is a long-term effort that works better when it targets network and emotion features than when it is random.34

    Evidence-backed
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  4. AI-scaled attacks erode Zero-Trust principles by raising false negatives, extending dwell time, and evading audit trails, and the survey argues only a generative-AI-aware redesign restores defensive parity.5

    Evidence-backed
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  5. A fully zero-click, ad-delivered spyware chain is not documented in the evidence on this page; the ad-plus-browser-vulnerability combination is the closest supported account.12

    Interpretation
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Quick questions from connected pages

What it means for you

Which fits you?

Pick the situation closest to yours. Each answer says what it rests on.

If you want to understand the mechanism rather than a specific incident

start from the drive-by-download model: an ad or page is the delivery surface and a browser vulnerability is the entry point, which is what removes the need for the user to install anything.1

Evidence-backed

If you are assessing how large the malvertising problem is

the reported 2024 figures are a 10% year-over-year rise in incidents, 29% involving misleading product offers, and adware at 35% of mobile threat detections — treat these as trend indicators from a qualitative study, not as a count of zero-click attacks.2

Evidence-backed

If you are thinking about how malicious campaigns spread and how to disrupt them

expect emotional content, especially fear, to drive larger and longer-lived malicious flows, and expect disruption to require targeting network and emotion features over the long term rather than random removal.34

Evidence-backed

If you are relying on Zero-Trust architecture against AI-scaled ad threats

the survey argues incremental extensions are insufficient and that a generative-AI-aware redesign is needed, because synthetic identities, context manipulation, and adversarial telemetry raise false negatives and evade audits.5

Evidence-backed

If you need a precise, current account of a zero-click ad-delivered exploit chain

the evidence here does not supply one; the 2005 browser-vulnerability findings are dated and the malvertising figures are aggregate trends, so the specific chain remains an open question on this page.12

Interpretation

The full explanation

Evidence-backed AI-prepared starting map

Digital ads can carry malicious code that infects a device through a drive-by download — an infection that happens when a browser or its components are exploited, without the user choosing to install anything. Research on spyware infection vectors documents that spyware spreads by making use of browser vulnerabilities and that it has appeared in Internet sectors generally considered "safe," including banking, online travel, and real estate sites. Malvertising — ads embedding malicious code and psychological manipulation — is a growing problem: incidents rose 10% year-over-year in 2024, with 29% involving misleading product offers (up from 26% the prior year), and adware accounted for 35% of mobile threat detections in 2024. What the sources do not yet establish is a fully zero-click chain in which an ad alone compromises a device with no interaction at all; the documented mechanism is browser-vulnerability exploitation during ad or page delivery.12

What this rests on5 independent sources
  • Evidence 14
  • Interpretation 5

The full story · 3 chapters

01

How infection without user action is understood

AI summary:Explains the drive-by download route through browser vulnerabilities, the ad-side malvertising trend, and why a complete zero-click chain remains inferred.

Evidence-backed

Evidence-backed: The clearest documented mechanism is the drive-by download: spyware infection occurs by exploiting browser vulnerabilities, so a device can be compromised through ordinary browsing rather than through a file the user deliberately runs. Spyware has been found to circumvent common security practices, funnel information to remote parties, and consume system resources, and it has appeared in bank, online travel, and real estate Internet sectors — areas users treat as safe. The same work identifies four common activities present in all spyware that lead to multiple behavioral capabilities, and examines how system security patch maintenance and browser differences affect susceptibility to drive-by downloads.1

Evidence-backed

Evidence-backed: Malvertising is the ad-side counterpart: malicious code and psychological manipulation are embedded in digital ads, and the tactic is converging with cognitive hacking and disinformation. Reported 2024 trends show incidents up 10% year-over-year, with 29% involving misleading product offers versus 26% the prior year, and mobile environments facing growing risk as adware accounted for 35% of mobile threat detections. The study behind these figures concludes that governance, threat-intelligence sharing, and integration of technical and psychological defenses all show major gaps.2

Interpretation

Interpretation: Putting the two together: an ad is a delivery surface, and a browser vulnerability is the entry point. That combination is what would make an ad-delivered compromise possible without the user installing anything — but the sources here stop short of describing a complete zero-click chain, so the step from "ad is served" to "spyware is installed and persists" remains inferred rather than documented.12

02

How malicious campaigns spread and how they are disrupted

AI summary:Describes research on how malicious links spread on social platforms and how network and emotion features help disrupt them.

Evidence-backed

Evidence-backed: Research on malicious URLs on Twitter analysed 105,642 malicious and 169,178 benign items to model how far information flows and how long it survives. For malicious content, negative emotions — especially fear — were associated with both the size and the survival of information flows, whereas for benign content positive emotions and positive sentiment predicted size and survival. Social and content factors were statistically significant for both samples.3

Evidence-backed

Evidence-backed: A follow-up study on disrupting drive-by-download networks found that network and emotion features were more effective for disruption than random strategies, and that strategically removing malicious users forces cybercriminal networks to become more vulnerable. The authors stress that successful disruption is a long-term effort because networks can be resilient — able to keep disseminating even when users are removed.4

Interpretation

Interpretation: These findings describe how malicious links propagate through social platforms and how defenders might break those networks. They do not describe ad-network abuse or zero-click delivery, so they should be read as context on campaign dynamics rather than as an explanation of the ad-delivered spyware mechanism itself.34

03

AI-scaled attacks and the limits of Zero-Trust defenses

AI summary:Outlines a survey arguing AI-scaled attacks erode Zero-Trust defenses and require a generative-AI-aware redesign.

Evidence-backed

Evidence-backed: A 2025 survey proposes the Cyber Fraud Kill Chain, a seven-stage attacker model — target identification, preparation, engagement, deception, execution, monetization, and cover-up — mapping generative techniques to the NIST SP 800-207 components they erode. It argues that synthetic identities, context manipulation, and adversarial telemetry raise false-negative rates, extend dwell time, and sidestep audit trails, undermining the Zero-Trust principles of "verify explicitly" and "assume breach." The authors state that existing guidance offers no systematic countermeasures for AI-scaled attacks, that compliance regimes struggle to audit content AI can mutate on demand, and that incremental extensions of current Zero-Trust architecture are insufficient — only a generative-AI-aware redesign will sustain defensive parity.5

Interpretation

Interpretation: This matters for ad-delivered threats because ad content can be generated and mutated at scale, which is exactly the property the survey says defeats static auditing. It is a general argument about AI-scaled fraud and Zero-Trust erosion, not a measurement of zero-click spyware through ads.5

Before you go

What to remember

Try to recall each hidden figure before you reveal it. Remembering, not rereading, is what makes it stick.

  1. Malvertising embeds malicious code and psychological manipulation in ads; reported 2024 figures show incidents up year-over-year, 29% involving misleading product offers, and adware at 35% of mobile threat detections.

  2. The documented infection route is the drive-by download: spyware exploits browser vulnerabilities, so browsing alone can compromise a device without the user installing anything.

  3. Malicious campaigns spread through social and emotional dynamics — fear is associated with larger and longer-lived malicious information flows — and disruption is a long-term effort that works better when it targets network and emotion features than when it is random.

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Sources

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  1. 1
    Taxonomy of Spyware and Empirical Study of Network Drive-By-Downloads
    Calhoun: The Naval Postgraduate School Institutional Archive (Naval Postgraduate School) (Barwinski)Published Aug 31, 2005Checked Oct 15, 2026
    “Spyware has rapidly become a major security concern in government and corporate networks as well as for home computers. Spyware is able to circumvent common security practices, funneling information to remote parties and consuming system resources with impunity. This malicious software has infiltrated common search engines and Internet sectors generally considered "safe." Making use of browser vulnerabilities, spyware infection is wide-spread. This thesis considers common infection vectors and reviews current definitions in arriving at an improved definition of spyware. It identifies four common activities present in all spyware which lead to multiple behavioral capabilities. An empirical analysis of network drive-by-downloads shows the presence of spyware in bank, online travel, and real estate-related Internet sectors. The impact of system security patch maintenance on spyware susceptibility, and browser differences in the context of drive-by-downloads is also presented.”
  2. 2
    Malvertising as a Vector for Cognitive Hacking: Integrating Technical and Psychological Defense Using the DISARM Framework
    RAIS Journal for Social Sciences (Burton)Published Apr 20, 2026Checked Oct 15, 2026
    “Malvertising, which embeds malicious code and psychological manipulation in digital ads, has become a major cybersecurity problem as it converges with cognitive hacking and disinformation. In 2024, incidents rose 10% year-over-year, with 29% involving misleading product offers, up from 26% the prior year, reflecting more deceptive tactics. Mobile environments face growing risks, as adware accounted for 35% of mobile threat detections in 2024. This qualitative study uses thematic analysis of recent industry data and academic reports to evaluate adaptive attack tactics and defense frameworks, including DISARM (Disinformation Analysis and Risk Management). Findings expose major gaps in governance, threat intelligence sharing, and the integration of technical and psychological defenses. The research concludes that a multidisciplinary strategy is vital to strengthen digital advertising ecosystem resilience and improve user protection. This work will interest cybersecurity professionals, researchers, policymakers, and digital advertising leaders seeking effective responses to emerging online threats.”
  3. 3
    Emotions Behind Drive-by Download Propagation on Twitter
    ACM Transactions on the Web (Javed et al.)Published Aug 25, 2020Checked Oct 15, 2026
    “From the malicious (N= 105, 642) and benign (N= 169, 178) data sample identified, we built models to predict information flow size and survival. We define size as the number of retweets of an original tweet, and survival as the duration of the original tweet’s presence in the study window. We selected the zero-truncated negative binomial (ZTNB) regression method for our analysis based on the distribution exhibited by our dependent size measure and the comparison of results with other predictive models. We used the Cox regression technique to model the survival of information flows as it estimates proportional hazard rates for independent measures. Our results show that both social and content factors are statistically significant for the size and survival of information flows for both malicious and benign tweets. In the benign data sample, positive emotions and positive sentiment reflected in the tweet significantly predict size and survival. In contrast, for the malicious data sample, negative emotions, especially fear, are associated with both size and survival of information flows.”
  4. 4
    Disrupting drive-by download networks on Twitter
    Social Network Analysis and Mining (Javed et al.)Published Aug 20, 2022Checked Oct 15, 2026
    “Policymakers and researchers have struggled to develop an efficient network disruption strategy to stop malware propagation effectively. We define an efficient strategy as one that considers network topology and dependency on network resilience, where resilience is the ability of the network to continue to disseminate information even when users are removed from it. One of the challenges faced while curbing malware propagation on online social platforms is understanding the cybercriminal network spreading the malware. Combining computational modelling and social network analysis, we identify the most effective strategy for disrupting networks of malicious URLs. Our results emphasise the importance of specific network disruption parameters such as network and emotion features, which have proved to be more effective in disrupting malicious networks compared to random strategies. In conclusion, disruption strategies force cybercriminal networks to become more vulnerable by strategically removing malicious users, which causes successful network disruption to become a long-term effort.”
  5. 5
    The Erosion of Cybersecurity Zero-Trust Principles Through Generative AI: A Survey on the Challenges and Future Directions
    Journal of Cybersecurity and Privacy (Xu et al.)Published Oct 15, 2025Checked Oct 15, 2026
    “To expose this compounding risk, we contribute the Cyber Fraud Kill Chain (CFKC), a seven-stage attacker model (target identification, preparation, engagement, deception, execution, monetization, and cover-up) that maps specific generative techniques to NIST SP 800-207 components they erode. The CFKC highlights how synthetic identities, context manipulation and adversarial telemetry drive up false-negative rates, extend dwell time, and sidestep audit trails, thereby undermining the Zero-Trust principles of verify explicitly and assume breach. Existing guidance offers no systematic countermeasures for AI-scaled attacks, and that compliance regimes struggle to audit content that AI can mutate on demand. Finally, we outline research directions for adaptive, evidence-driven ZTA, and we argue that incremental extensions of current ZTA that are insufficient; only a generative-AI-aware redesign will sustain defensive parity in the coming threat cycle.”

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Open questions

  • What does a complete zero-click ad-delivered spyware chain look like in practice — which ad or rendering component is exploited, and how does installation and persistence follow without any user action?

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  • How much of the 2005 drive-by-download and browser-vulnerability picture still applies to today's ad-delivery stacks and mobile browsers?

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  • How are ad networks and ad exchanges abused to place malicious creatives, and what fraction of malvertising incidents involve zero-click rather than click-dependent delivery?

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  • Which governance, threat-intelligence-sharing, and technical-plus-psychological defenses are most effective against ad-delivered spyware, given the reported gaps?

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