Trojan:HTML/Magecart identifies code on a webpage that shares similarities with harmful code known to be used by the Magecart hacking group. The harmful code is designed to to steal personal and credit card details by harvesting any information a user enters into a website's payment processing form.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
The Magecart hacking group gained notoriety in late 2018, following a cyberattack on a major airline's website that lead to a data breach involving hundreds of thousands of online customer transactions, including personal and credit card details. There have also been reports of other websites, including a ticketing site and website push notification service, also being affected by the Magecart code.
Reports of the initial incident attributed the breach to harmful code that was silently inserted onto the website, which harvested the information customered entered in the payment form on the site.
Subsequent news reports about other breaches attributed to the Magecart group suggested that the attackers exploited vulnerabilities in the websites to silently insert the harmful code.