How does a watering hole attack work?

Attackers first profile a target group and identify websites they regularly use. They then exploit vulnerabilities or stolen credentials to inject malicious scripts that target only matching visitors.

What are notable examples of watering hole attacks?

In 2024, Google linked campaigns to APT29 that compromised Mongolian government websites with hidden frames. Another 2026 campaign used malicious JavaScript via a Ukrainian analytics service to target mobile users in the US and Europe.

How do you prevent watering hole attacks on a website?

Website owners should regularly inspect for unauthorized scripts, keep CMS and plugins updated, and enforce MFA for admins. Monitoring third-party components like analytics scripts also reduces risk of hidden malicious injection.

What is watering-hole-as-a-service?

It is a dark-web offering that bundles exploit kits for known vulnerabilities into ready-to-use platforms. Buyers configure a target website and payload, and the kit automates victim identification and malware delivery.

How do watering hole attacks identify target visitors?

Malicious code collects browser type, OS, IP, and device details to match criteria set by the attacker. Visitors who do not fit the profile see the normal site, which also hinders detection by researchers.

Watering Hole Attacks Explained: How Hackers Turn Trusted Websites into Traps

Cyber threats have grown more advanced over time, with attackers constantly developing new ways to compromise their targets. One particularly deceptive technique is the watering hole attack, which involves compromising websites that specific individuals or organizations frequently visit. Rather than approaching victims directly, hackers turn familiar online platforms into traps, waiting for their intended targets to visit and unknowingly expose their devices to malicious activity. Attackers have used watering hole attacks in various campaigns. Their ability to exploit trusted websites makes them hard to detect. In this article, we explain how watering hole attacks work, why hackers use them, the damage they can cause, real-world examples, and how individuals and organizations can protect themselves.

What Is a Watering Hole Attack?

A watering hole attack is a targeted cyberattack in which hackers compromise a legitimate website frequently visited by a particular group of people. The attackers secretly introduce malicious code or other harmful content into the website, allowing them to infect visitors' devices or trick them into downloading malware. The name comes from the way predators hunt animals in the wild. Rather than chasing their prey, predators wait near watering holes where animals regularly gather to drink. Once their targets arrive, they have an opportunity to attack.

How Do Watering Hole Attacks Work?

Watering hole attacks generally involve several stages.

1. Identifying and Researching the Targets

The first step is identifying the people or organizations the attackers want to compromise. Unlike attacks that target large numbers of random internet users, watering hole attacks are often designed for specific groups. These might include government employees, financial institutions, healthcare workers, journalists, technology companies, defense contractors, or employees in a particular industry. Attackers use open-source intelligence to gather information about their targets' online behavior and interests. For example, LinkedIn profiles can reveal the conferences employees attend and the professional groups they belong to, while social media activity may expose the software tools, industry publications, and resources their teams regularly use. The objective is to find a website that provides access to a large portion of the intended target group.

2. Selecting a Suitable Website

Once attackers understand their targets' online habits, they look for websites that could serve as watering holes. These websites are often legitimate platforms with established audiences. They may belong to professional associations, government institutions, media organizations, industry suppliers, or community groups. Attackers generally prefer websites that their targets trust and visit regularly. A compromised industry news portal, for example, could expose employees from several organizations to malware without requiring the attackers to compromise each company individually. The attackers also look for security weaknesses that could help them gain control of the website. These might include outdated content management systems, vulnerable plugins, poorly secured administrative accounts, exposed server services, or stolen website administrator credentials. A website does not have to be poorly designed or suspicious to become a watering hole. Even established platforms can be compromised through vulnerabilities or stolen credentials.

3. Compromising the Website

After selecting a suitable website, attackers attempt to gain unauthorized access and modify its content or functionality. Credential stuffing is one of the less noticeable ways attackers gain unauthorized access to websites. They use username and password combinations stolen in earlier data breaches, often obtained from dark-web marketplaces, and rely on automated tools to try these credentials against website administration systems. These systems may include content management system (CMS) login pages, hosting control panels, and FTP accounts. If attackers find working login details for a WordPress administrator account or a cPanel dashboard, they can gain the ability to change website files, insert malicious scripts, or modify DNS settings. The rise of watering-hole-as-a-service has also made these attacks more accessible to less-skilled cybercriminals. Exploit kits identified during 2024 and 2025 have bundled exploits for known software vulnerabilities into ready-to-use platforms advertised on dark-web forums. Instead of developing their own attack tools, buyers can configure the website they want to target and select a malicious payload. The exploit kit then automates several stages of the operation, including identifying visitors' browsers, choosing suitable exploits, and delivering the payload.

4. Identifying Visitors and Selecting Victims

Not everyone who visits a compromised website will necessarily receive malware. Attackers often configure their malicious code to identify visitors who match specific criteria. This helps them avoid exposing their tools to unnecessary users and increases the chances of reaching valuable targets. The malicious code may collect information such as the visitor's browser type, operating system, device details, and IP address. Attackers can use this information to determine whether a visitor belongs to the group they want to target. For example, a campaign targeting government employees in a particular country might only activate when visitors connect from certain locations or use specific devices. Other visitors may see the website as usual without knowing that malicious activity is taking place in the background. This selective approach also makes watering hole attacks harder to investigate. Security researchers who visit a compromised website may not trigger the malicious behavior if they do not meet the attacker's conditions.

5. Delivering Malware or Exploiting Vulnerabilities

When an employee who matches the attacker's target profile visits the compromised website, the malicious code attempts to infect their device or steal sensitive information. In a drive-by download attack, malware may be installed without requiring the visitor to click anything or take any other action. This can happen when attackers exploit vulnerabilities in the browser or its plugins, allowing malicious software to be downloaded and executed while the website loads. In other campaigns, the injected code relies on social engineering to trick visitors into taking action. For example, users may encounter fake browser update alerts, fraudulent software patch notifications, or imitation login pages designed to capture their usernames and passwords. The type of malware delivered depends on what the attackers want to achieve. Some campaigns use remote access trojans (RATs) to maintain access to infected devices and monitor victims. Others deploy keyloggers to record keystrokes, information stealers to collect sensitive data, or ransomware-related malware that gives attackers an initial foothold before launching a subsequent file-encryption attack.

6. Stealing Information and Expanding Access

Once attackers compromise a device, they can begin carrying out their objectives. Depending on the attackers' goals, the final objective may be corporate espionage, financial theft, surveillance, intellectual property theft, or disruption of business operations.

Common Techniques Used in Watering Hole Attacks

Malicious JavaScript Injection

JavaScript is commonly used to make websites interactive and load additional content. Attackers can abuse this functionality by injecting malicious scripts into legitimate websites. These scripts may collect information about visitors, redirect selected users to malicious websites, or load additional code from attacker-controlled servers. Because JavaScript is widely used across the internet, malicious scripts can sometimes blend in with the normal activity of a website.

Drive-By Downloads

A drive-by download occurs when malware is downloaded or installed on a device during a website visit, sometimes without the user realizing it. Attackers may exploit vulnerabilities in browsers, browser extensions, or other software to execute malicious code. In other cases, they trick users into downloading files disguised as legitimate updates or applications. Keeping browsers and operating systems updated is important because attackers frequently look for devices running vulnerable software.

Exploiting Zero-Day and Unpatched Vulnerabilities

Some watering hole campaigns use software vulnerabilities to compromise visitors' devices. A zero-day vulnerability is a security flaw that is unknown to the software vendor or has no available security patch at the time it is exploited. Such vulnerabilities can be particularly valuable to attackers because security products may not recognize the associated attack techniques. However, attackers do not always need zero-day exploits. They can also exploit known vulnerabilities when users have not installed available security updates.

Malicious Redirects and Hidden Frames

Attackers can insert hidden frames or redirects into compromised websites. These elements load content from another server without requiring visitors to click anything. For example, a legitimate website might quietly load a hidden frame connecting to an attacker-controlled server. That server can then determine whether the visitor matches the attacker's target profile and deliver malicious content when appropriate. Visitors may never see the malicious page or realize that their browser has connected to another website.

Compromised Third-Party Components

Modern websites often depend on external services, including advertising networks, analytics platforms, content delivery networks, and plugins. If attackers compromise one of these services, they may be able to inject malicious content into multiple websites that rely on it. This creates a wider security problem because the owners of affected websites may not even know that a third-party component has been compromised.

Real-World Examples of Watering Hole Attacks

In November 2026, cybersecurity researchers discovered a watering hole campaign linked to Russian hackers targeting iOS and Android users through compromised websites across the United States and Europe. According to the researchers, the attackers injected malicious JavaScript into websites to identify visitors and deliver exploits to selected devices. They also compromised Plerdy, a Ukrainian web analytics service, allowing malicious code to spread through its tracking script to hundreds of websites, including platforms associated with military and defense organizations. In August 2024, Google's Threat Analysis Group reported several watering hole campaigns targeting visitors to Mongolian government websites. The attacks took place between November 2023 and July 2024 and involved compromised websites belonging to Mongolia's government, including the Cabinet and Ministry of Foreign Affairs websites. According to Google, the attackers injected hidden frames into the compromised websites. These frames loaded content from attacker-controlled domains and delivered exploits to selected visitors. The campaigns initially targeted Apple devices using an exploit affecting older versions of iOS. Later operations targeted Android users through Chrome browser exploit chains. Google linked the activity with moderate confidence to APT29, a Russian government-backed threat group.

How Organizations Can Protect Themselves From Watering Hole Attacks

1. Keep Browsers and Software Updated

Outdated browsers, operating systems, plugins, and applications can contain vulnerabilities that attackers exploit to infect visitors. Individuals should install security updates as soon as they become available and enable automatic updates where possible.

2. Use Reliable Endpoint Protection

Antivirus and endpoint detection and response (EDR) solutions can help identify and block malicious files, suspicious scripts, and unusual activity on computers. These tools may detect malware delivered through compromised websites before it causes significant damage. Organizations should ensure that endpoint security software is installed, updated, and actively monitoring devices used by employees. However, endpoint protection should not be treated as a complete solution. Sophisticated attacks may use techniques that evade traditional security tools.

3. Apply Web Filtering and Browser Protection

Organizations can use secure web gateways, DNS filtering, and browser security features to block access to known malicious websites and suspicious destinations. Some security solutions can also detect malicious redirects, unsafe downloads, and suspicious website behavior. Browser isolation is another useful security measure. It separates website activity from the user's actual device, reducing the risk that malicious website content can directly compromise the computer.

4. Monitor Websites and Third-Party Components

Website owners should regularly inspect their platforms for suspicious changes, unauthorized scripts, unexpected redirects, and unfamiliar administrator accounts. They should also keep content management systems, plugins, themes, and server software updated. Website administrators should use strong passwords, MFA, restricted administrative access, and security monitoring to reduce the risk of unauthorized changes.

5. Browser Isolation and Sandboxing

Organizations can use browser isolation and sandboxing technologies to run web browsing activities in separate, controlled environments, keeping potentially harmful website content away from users' devices and internal networks. These solutions help prevent malicious scripts, infected downloads, and browser-based exploits from directly compromising endpoints. Even if an employee visits a compromised website, the isolated environment can limit the malware's ability to access local files, steal sensitive information, or spread to other systems.

Conclusion

Watering hole attacks is an example of how cybercriminals can turn the websites people trust into tools for compromising their devices and stealing sensitive information. Protecting against this threat requires more than simply avoiding suspicious websites. Individuals and organizations must keep their software updated, use reliable endpoint protection, secure their online accounts, and monitor unusual network activity. Website owners also have a responsibility to protect their platforms through regular security updates, strong access controls, and continuous monitoring.

Watering Hole Attacks Explained: How Hackers Turn Trusted Websites into Traps

What Is a Watering Hole Attack?

How Do Watering Hole Attacks Work?