The Netcraft Browser Extension now offers credential leak detection for extra protection against shopping site skimmers.

With brick-and-mortar shops around the world closed due to COVID-19, consumers turned to online businesses to fulfil their shopping needs. According to Adobe’s Digital Economy Index report, US online spending in June was $73 billion, up 76% from $42 billion last year. Even with restrictions lifted, research commissioned by Visa suggests that 74% of Britons who shopped online more often during the lockdown will continue to do so.

Now more than ever it is important to protect against JavaScript skimmers. These are snippets of malicious code which criminals upload to compromised shops. Unbeknownst to the store owner or the user, they transmit entered card details directly to the criminal. Unlike scams such as phishing, which can often be avoided by a vigilant internet user, skimmers are invisible to the human eye without a tool such as the Netcraft Extension to expose them.

Netcraft currently blocks over 6,000 shopping sites which contain skimmers, and even large companies such as British Airways, Ticketmaster and Puma have fallen prey to these attacks in the past.

When you visit a shopping site, the Netcraft extension will evaluate all requests made by the web page. If a request is found to be sending credentials to a different domain, the extension will block the request to prevent your data from being stolen. A block screen will notify you about the request and provide information about the malicious behaviour that was detected. Only card number leaks are currently blocked, but other types of credentials may be enabled in future updates.

For example, if you check out using your credit card on exampleshoppingsite.com but your card details are sent to examplebadsite.com, the extension will block the request. This checking is done locally and securely in your browser – no sensitive information is sent to Netcraft.

The extension will also block pages which make requests to malicious domains that are part of JavaScript attacks.

In addition to shopping site skimmers, the Netcraft Extension also protects against other malicious JavaScript, phishing and fake shops, including those related to coronavirus. The extension is available for Chrome, Firefox, Opera and the new Microsoft Edge based on Chromium.

If you already have the Netcraft Extension installed, your browser will update it automatically.

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The current coronavirus pandemic has resulted in the closure of many pubs, restaurants, and brick-and-mortar retail stores. Many purchases that would previously have been made in person now take place online. In research commissioned by Visa, 89% of Britons have shopped online since the UK’s lockdown restrictions began, with 31% buying items online for the first time during this period. This increase in online shopping activity benefits criminal groups in that: smaller businesses newly reliant on online transactions provide attackers with a stream of inadequately-defended shopping sites to exploit, and buyers are far more likely to be driven to these compromised shops or to fake shops compared to before the pandemic.

JavaScript skimmers run on compromised shopping sites. When shoppers enter their payment details, the skimmer secretly sends a copy to the attacker - potentially even if the customer does not complete the transaction. Even the most careful of users can be victims of these attacks, as they appear on compromised but otherwise well-intentioned shops with no visual indication of their presence.

Fake shops are another threat. Shoppers seeking bargains may unknowingly find themselves on a fake shop which claims to offers the products they want at a highly discounted price, but the victim will subsequently only receive counterfeit goods, no goods at all, or have the transaction aborted after entering credentials which is equivalent to a phishing attack.

Fake shops also take advantage of the pandemic by offering goods in high demand due to coronavirus, such as N95 masks. The FBI has released a Public Service Announcement about an increase in online shopping scams involving the sale of counterfeit healthcare products such as Personal Protective Equipment (PPE). To date, Netcraft has blocked over a thousand such coronavirus-themed fake shops, 80,000 other fake shops selling all sorts of counterfeit goods, and around 3,500 compromised shops hosting JavaScript skimmers.

The Netcraft browser extension and mobile apps provide protection against fake shops as well as legitimate shopping sites that have been compromised with JavaScript skimmers. When an extension or app user visits one of these dangerous shops, Netcraft will block access to the shop and alert them:

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