Security researchers discovered that attackers are also deploying a Linux backdoor on compromised e-commerce servers after injecting a credit card skimmer into online shops’ websites.
The PHP-coded web skimmer (a script designed to steal and exfiltrate customers’ payment and personal info) is added and camouflaged as a .JPG image file in the /app/design/frontend/ folder.
The attackers use this script to download and inject fake payment forms on checkout pages displayed to customers by the hacked online shop.
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Source: Bleeping Computer