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Cybersecurity researchers have uncovered a dangerous malware campaign targeting e-commerce sites, particularly those running on Magento. This campaign employs an innovative and stealthy approach, embedding malicious code within image tags in HTML to avoid detection by traditional security measures. The malware, known as MageCart, is designed to steal sensitive payment information from unsuspecting users and is a significant threat to online retailers.
MageCart is a type of malware capable of pilfering payment details, such as credit card numbers, expiration dates, and CVVs, from online shopping platforms. It operates using various techniques on both the client and server sides, making it a persistent and sophisticated threat. In this latest campaign, the malware hides its malicious code inside <img> tags, which are commonly used to display images on web pages. This makes the malicious code difficult to spot, even by website administrators or security tools.
The attack typically occurs when users enter their payment information on the checkout page. The malware waits until the user submits their payment details and then captures that sensitive information in real time. MageCart attacks have evolved over time, from targeting Magento sites to adapting to other e-commerce platforms like WooCommerce and PrestaShop. The attackers’ goal is to remain undetected for as long as possible, ensuring a successful theft of financial data.
What Undercode Says:
MageCart malware is a growing and evolving threat in the cybersecurity landscape, and this latest method of hiding malicious code inside image tags is a significant step forward in the malware’s sophistication. The use of the <img> tag, a standard element for embedding images in HTML, allows attackers to remain under the radar. By embedding Base64-encoded malicious JavaScript in the image source, attackers take advantage of the browser’s inherent trust in these image elements.
The technique hinges on the “onerror” event, which is triggered when an image fails to load. Normally, this event would just display a broken image icon, but in the case of this attack, the event is hijacked to execute JavaScript. This subtle manipulation allows the malware to run without raising alarms. Security scanners, which typically focus on malicious scripts or suspicious file uploads, may overlook this attack because it masquerades as an innocent image element.
The dynamic nature of the attack ensures it remains highly effective. Once the malicious JavaScript is activated, it checks if the user is on the checkout page and waits for the user to submit their payment details. The malware then injects a fake form into the page, collecting vital payment information such as credit card numbers, expiration dates, and CVVs, which is then sent to an external server. This technique ensures that the attacker has all the details needed to commit financial fraud.
One of the most concerning aspects of this attack is its ability to evade detection for long periods. By hiding in plain sight as an image element, the malicious script is unlikely to be flagged by security software scanning for typical attack vectors like JavaScript exploits or suspicious form submissions. Additionally, because the <img> tag is so ubiquitous, it doesn’t raise any suspicions from website administrators or security teams who may be monitoring the site.
The continued evolution of MageCart attacks highlights the growing complexity of cyber threats targeting e-commerce platforms. As these attackers shift their tactics and make their malware more difficult to detect, website administrators must be vigilant in their defense strategies. Regular security scans that include checks for hidden malicious code in all HTML elements, including <img> tags, are crucial in preventing these types of attacks. Additionally, e-commerce platforms should implement more robust monitoring and anomaly detection systems to identify suspicious activities, such as unauthorized form submissions or unexpected outbound data transmissions.
It’s also important to note that MageCart isn’t the only threat out there. Researchers have also pointed to another evolving attack vector in WordPress sites, where attackers have used must-use plugins to implant backdoors and execute malicious PHP code. These plugins, unlike regular plugins, are automatically loaded on every page load, making them difficult to disable or detect. This type of persistent attack exemplifies the lengths to which cybercriminals will go to maintain control over compromised sites.
Given these evolving threats, online retailers and businesses running on platforms like Magento, WooCommerce, and WordPress need to ensure they are taking comprehensive security measures to protect both their sites and their customers’ data. Regular updates, secure coding practices, and using advanced threat detection tools are essential steps in combating the ever-growing array of cyber threats. As the landscape of e-commerce security continues to change, staying ahead of these threats will require continuous adaptation and vigilance from website administrators and security teams.
References:
Reported By: https://thehackernews.com/2025/02/cybercriminals-exploit-onerror-event-in.html
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