Web skimming

Web skimming, formjacking or a magecart attack is an attack where the attacker injects malicious code into a website and extracts data from an HTML form that the user has filled in. That data is then submitted to a server under control of the attacker.[1][2]

Mitigation

Subresource Integrity or a Content Security Policy can be used to protect against formjacking, although this does not protect against supply chain attacks. A web application firewall can also be used.[2][3]

Prevalence

A report in 2016 suggested as many as 6,000 e-commerce sites may have been compromised via this class of attack.[4] In 2018, British Airways had 380,000 card details stolen in via this class of attack.[5] A similar attack affected Ticketmaster the same year with 40,000 customers affected[6] by maliciously injected code on payment pages.

Magecart

Magecart is software used by a range[7] of hacking groups for injecting malicious code into ecommerce sites to steal payment details.[8] As well as targeted attacks such as on Newegg,[9] it's been used in combination with commodity Magento extension attacks.[10] The 'Shopper Approved' ecommerce toolkit utilised on hundreds of ecommerce sites was also compromised by Magecart[11] as was the conspiracy site InfoWars.[12]

According to Malwarebytes, The Magecart software has tried to avoid detection by using the WebGL API to check whether the used renderer is either "swiftshader", "llvmpipe" or "virtualbox", which would indicated that the software is running in a virtual machine and thus not a real world victim.[13]

References
  1. Reddy, Niranjan (2019). Practical Cyber Forensics : an Incident-Based Approach to Forensic Investigations. Berkeley, CA. ISBN 1-4842-4460-5. OCLC 1110377452.
  2. "You Need to Protect Your Website Against Formjacking Right Now". PCMag. Retrieved 2021-05-20.{{cite web}}: CS1 maint: url-status (link)
  3. Wueest, Candid. "Internet Security Threat Report - Formjacking: How Malicious JavaScript Code is Stealing User Data from Thousands of Websites Each Month". Symantec.{{cite web}}: CS1 maint: url-status (link)
  4. Ismail, Nick (13 October 2016). "Stowaways: malicious skimming code hiding in almost 6,000 online shops". Retrieved 9 December 2018.
  5. Whittaker, Zack (11 September 2018). "British Airways breach caused by credit card skimming malware, researchers say". Retrieved 9 December 2018.
  6. Priday, Richard (28 June 2018). "The Ticketmaster hack is a perfect storm of bad IT and bad comms". Retrieved 9 December 2018.
  7. Whittaker, Zack (13 November 2018). "Meet the Magecart hackers, a persistent credit card skimmer group of groups you've never heard of". Retrieved 9 December 2018.
  8. Muncaster, Phil (1 October 2018). "Magecart: Time to Focus on Web Security to Mitigate Digital Skimming Risk". Archived from the original on 10 December 2018. Retrieved 9 December 2018.
  9. Osborne, Charlie (19 September 2018). "Magecart claims another victim in Newegg merchant data theft". Retrieved 9 December 2018.
  10. Cimpanu, Catalin (23 October 2018). "Magecart group leverages zero-days in 20 Magento extensions". Retrieved 9 December 2018.
  11. Leyden, John (9 October 2018). "Payment-card-skimming Magecart strikes again: Zero out of five for infecting e-retail sites". Retrieved 9 December 2018.
  12. Blake, Andrew (14 November 2018). "Alex Jones' Infowars store infected with malware capable of skimming payment data". Retrieved 9 December 2018.
  13. "Magecart Credit Card Skimmer Avoids VMs to Fly Under the Radar". Threatpost. Retrieved 2022-04-03.
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