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Parrot TDS is a traffic direction system: malicious code injected into a compromised website profiles visitors and, when conditions are met, can send their browsers to a malicious page or other harmful content. Avast reported finding it on more than 16,500 websites in 2022. That is a historical observation—not a current count of infected sites.
How Parrot TDS works
A traffic direction system filters and routes web traffic. In the flow described by Palo Alto Networks Unit 42, Parrot TDS begins with a landing script injected into JavaScript files hosted on a compromised site. The script checks a visitor’s environment and gathers information about that visitor. If its conditions are met, the browser requests a payload from a separate server; that payload can direct the browser to a malicious webpage or other potentially harmful content.
The compromised site can therefore act as an intermediary. It may look and function normally for many visitors while serving injected code or triggering a redirect for selected visitors. A website’s familiar appearance does not rule out a compromise of its files or server.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors“This injected script consists of two components: an initial landing script that profiles the victim, and a payload script that can direct the victim’s browser to a malicious location or piece of content.” — Palo Alto Networks Unit 42, “Parrot TDS: A Persistent and Evolving Malware Campaign”
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What researchers observed—and what remains uncertain
Code markers can help identify samples
Unit 42 identified strings including ndsj and ndsw in landing scripts and ndsx in payloads. These are clues for grouping or investigating samples, not a complete, permanent signature that can rule Parrot TDS in or out by itself.
Sucuri’s 2024 report describes an NDSW/NDSX variant using obfuscated injected code and a custom PHP proxy. It says the markers changed in April 2024 to zqxw, zqxq and qwzx. The change is a reason not to rely on a single string search as a definitive test.
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No single entry method is established
Avast reported compromised servers using multiple content-management systems, most often WordPress and Joomla. It proposed that weak login credentials or poorly secured servers might have enabled access, but said it did not have enough information to confirm that explanation. Unit 42 also notes that server-side vulnerabilities can affect sites that do not use a CMS. The available findings do not establish one universal initial-access route, a particular plugin flaw or weak passwords as the cause in every case.
What the reported numbers mean
Published counts refer to different dates and measurements. They should not be combined into a single estimate of the network’s current size.
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| Reported figure | What it measures | Source and context |
|---|---|---|
| More than 16,500 websites | Sites Avast said were affected; they included adult-content sites, personal websites, universities and local government. | Avast, 2022. A historical observation, not a present-day network count. |
| More than 600,000 unique users globally | Users Avast said it protected from visiting infected sites between March 1 and March 29, 2022. Avast also reported more than 73,000 in Brazil, nearly 55,000 in India and more than 31,000 in the United States during that interval. These are protected-user observations, not counts of infected websites or infections. | Avast, 2022. |
| More than 10,000 landing scripts | Samples analyzed, not infected websites. Unit 42 said the samples came from internal and external data sources and covered August 2019 through October 2023. | Palo Alto Networks Unit 42, 2023 analysis. |
| More than 61,000 websites in 2021 | A separate site count attributed to Sucuri in a 2022 report by The Hacker News. Its measurement context differs from Avast’s figure, so the two counts should not be treated as directly comparable. | The Hacker News, 2022, reporting Sucuri’s 2021 figure. |
There is also a difference in the reported timeline. Public reporting described Parrot TDS as active since October 2021; Unit 42’s retrospective sample data suggested it may have appeared as early as 2019. The earlier date is an inference from analyzed samples, not the same kind of claim as the public-reporting start date.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How a site owner can investigate a suspicion
There is no single marker or universal test in these reports that can confirm or exclude Parrot TDS on every site. If you suspect a compromise, treat it as a possible server or website-file issue—not just a suspicious page visible in your own browser.
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- Arrange a website malware scan, and consider qualified incident-response support if the site or its hosting environment may be compromised.
- Choose the investigation route based on whether you need a one-time scan or hands-on cleanup, whether the concern is limited to site files or may involve hosting/server access, and whether the provider supports your CMS and hosting setup.
- If there is an urgent incident, prioritize incident response rather than relying on a scan alone. A scan can help investigate; it is not, by itself, proof that every affected file or access path has been addressed.
- Do not treat the strings listed above as a complete detection rule. Variants and markers have changed, and the cited reports do not provide a universal cleanup procedure.
Unit 42 directs organizations that believe they may be compromised to its Incident Response team. Sucuri’s reporting discusses the injected-code and proxy behavior relevant to scanning and cleanup. Neither source, in the findings summarized here, establishes a guaranteed remediation checklist for every affected site.
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