MirrorMask: Protect Your Checkout Data from Silent Skimming

Urgent Security Alert: MirrorMask E-Skimming Threat |
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At Turaco Labs, we've identified a live digital skimmer, dubbed 'MirrorMask,' that silently hijacks Stripe Elements (and potentially other gateways). This subtle attack proxies Stripe through a look-alike mirror system, making it incredibly difficult to detect. |
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Stripe Elements is trusted for secure payment card data collection. MirrorMask bypasses these checks by relaying traffic through a controlled mirror server, maintaining a normal-looking checkout while siphoning data. We've seen no evidence of a weakness in Stripe's platform; the compromise occurs on the merchant site. I recommend that we protect ourselves against this threat. |
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A small code change redirects Stripe's script domain to the attacker's, which then mirrors Stripe while injecting skimmer logic. This clever technique spoofs headers, making the attack appear legitimate. |
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For the time being, this attack primarily targets merchants using Stripe Elements. I recommend checking for unexpected hosts serving Stripe paths or harmless-looking string replacements in your templates. |
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To defend against MirrorMask, I suggest you: |
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- Enforce a site-wide CSP (Content Security Policy) for scripts/frames and API calls.
- Verify build and template sources for unexpected domain replacements.
- Tighten change control and audit admin access.
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ThreatView is designed to catch threats like MirrorMask with: |
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- File System Integrity Monitoring (FIM): Flags even single-line changes.
- Checkout Monitoring: Continuously validates that sensitive flows only call approved domains.
- Deep External Malware Scanning: Performs daily scans for hidden malicious code.
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Protect your online business with ThreatView. I'm here to help you deploy CSP or scan your checkout for MirrorMask-style issues. Contact me today! |
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