A hidden editor recovery file let a malicious Magento checkout skimmer survive ordinary cleanup. In a July 2024 report, Sucuri described one affected e-commerce site: attackers had modified app/bootstrap.php, while a second malicious copy remained in bootstrap.php-swapme. Replacing the visible PHP file and clearing caches did not remove that hidden copy. The case is a practical warning for store owners: investigate the whole environment, preserve evidence, and verify checkout traffic—not just the obvious file.
What happened in the Magento incident?
Sucuri’s July 19, 2024 investigation describes a skimmer injected into a Magento site’s checkout responses. The modified app/bootstrap.php added malicious JavaScript to pages associated with checkout. When a customer submitted the payment form, the script read form values, including names, addresses, card numbers, and other checkout information, and sent captured data to amazon-analytic[.]com. Sucuri reported that the domain was registered in February 2024 and had appeared in other card-theft cases. Sucuri’s incident account provides the technical details.
The key persistence artifact was a second copy of the malicious file named bootstrap.php-swapme. After the visible bootstrap file was replaced and caches were cleared, the skimmer still appeared. Sucuri found that the swap file contained the malicious content; removing it and clearing caches led to a clean checkout page in the investigation.
This was a server-side file compromise that altered what customers’ browsers received. The observed JavaScript was a browser-side skimmer, but the evidence does not establish a compromise of a payment processor’s systems. Nor does the report quantify how many customers were affected or whether stolen card details were used fraudulently.
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What an editor swap file is—and what it is not
An editor swap or recovery file is a temporary file used by some text editors to preserve in-progress work, for example if a session ends unexpectedly. It is unrelated to Linux swap memory or a system pagefile. Depending on the editor and its configuration, such files may have names like bootstrap.php-swapme, hidden names such as .bootstrap.php.swp, or other backup and recovery suffixes.
These files are not automatically malicious: a legitimate editing session can create them. In this incident, the significant fact was that the file held the same malicious content as the altered bootstrap file. Check its contents, ownership, timestamps, and whether it matches a known editing session before treating it as evidence of compromise.
Why replacing the visible file was not enough
A clean-looking primary file does not prove that every alternate, hidden, temporary, backup, symlinked, or generated copy is clean. The swap file gave the attackers’ code a way to persist or reappear after the obvious file was replaced. Restarting services or flushing caches cannot remove malicious source code that remains on disk.
Searching only the most obvious files in the document root can also miss other persistence. An investigation should include the entire hosting account and relevant application, system, and deployment configuration. A suspicious file is one lead, not a complete explanation of how access was obtained.
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What the report establishes—and what it does not
- Documented: Sucuri investigated one Magento e-commerce site, a modified
app/bootstrap.php, and the maliciousbootstrap.php-swapmefile. - Not established: The initial access route, a particular Magento vulnerability or CVE, a named threat actor, a confirmed victim count, or payment-card fraud losses.
- Access hypothesis: Sucuri considered SSH or another terminal-based editing session likely because of the editor-style swap file, but this was an inference, not a confirmed entry method. The contemporaneous Hacker News account likewise did not establish how the attacker got in.
- Scale: A plural headline does not turn the single documented site into evidence of a campaign with a known number of victims. The domain’s reported appearance in other card-theft cases does not by itself establish a common operator.
How to respond if your Magento checkout may be compromised
1. Contain the risk and preserve evidence
- Put the store into maintenance mode or temporarily disable checkout if active payment theft is suspected.
- Before deleting or changing files, preserve a suitable forensic snapshot of the disk or file system, database, web-server and PHP-FPM logs, SSH logs, and hosting environment. Restrict access to the preserved evidence.
- Notify the payment processor, acquiring bank, incident-response provider, and appropriate legal or privacy contacts. Record the suspected compromise window and assess which orders or sessions may have been exposed.
- Block or monitor the case-specific indicator
amazon-analytic[.]comat appropriate network controls. Do not treat that domain as a complete detection rule; attackers can change infrastructure.
Do not rely on a public website scanner alone. A skimmer may activate only on checkout URLs, for particular request methods or visitor states, or after a customer interaction.
2. Hunt for hidden copies and related indicators
Run investigative commands as an appropriately privileged administrator, preferably on a forensic copy first. Adapt paths to the actual Magento root and hosting environment:
cd /path/to/magento
find . -type f (
-name '*swapme*' -o
-name '.*.swp' -o
-name '.*.swo' -o
-name '*~'
) -printSearch for case-specific indicators and suspicious behavior:
grep -RInE
'amazon-analytic|bootstrap.php-swapme|ob_filter_callback|base64_decode|curl_init|querySelectorAll'
app pub var generated vendor 2>/dev/nullInspect the bootstrap file and nearby file metadata:
Best Value
stat app/bootstrap.php
sha256sum app/bootstrap.php
find app -type f -printf '%TY-%Tm-%Td %TT %u %g %pn' | sortThese are examples, not a complete malware-detection procedure. Magento and legitimate extensions may use functions such as base64_decode or curl_init, while an attacker can use different indicators. Compare files against a trusted copy of the same Magento version and build rather than assuming a single string match proves infection or cleanliness.
3. Look beyond the PHP file
- Search the full account for unexpected PHP, hidden editor files, and modified core files, including writable and generated locations.
- Review cron jobs, systemd timers, SSH authorized keys, users, deployment hooks, web-server configuration, and PHP auto-prepend settings.
- Check Magento administrator accounts, database configuration, and content-injection fields.
- Review file ownership and permissions, SSH authentication, administrator activity, and unexpected outbound HTTP or HTTPS traffic.
- Quarantine suspicious files for analysis instead of immediately deleting them. Preserve timestamps and a copy before removal.
The Sucuri incident involved the swap file, but a store can have other persistence mechanisms. Removing one artifact does not establish that the attacker has lost access.
4. Restore trusted code, rotate credentials, and validate checkout
- Reinstall or redeploy Magento core from a trusted package matching the site’s version and build. Compare extensions and themes against trusted copies as well.
- Remove confirmed malicious artifacts only after preserving evidence. Rebuild generated files and clear Magento caches after restoring trusted code; restart PHP or web services only as part of a controlled remediation plan.
- Update Magento, extensions, themes, PHP, the operating system, and server software. Patching reduces exposure to known weaknesses but does not clean an existing compromise.
- Rotate SSH keys, hosting and control-panel credentials, Magento administrator passwords, database passwords, API keys, deployment secrets, and payment-related credentials that may have been exposed.
- Review authentication and administrative logs, then test checkout in a clean browser and an instrumented test environment. Inspect page source and browser network requests for unauthorized scripts or destinations, including the known case indicator.
- Compare production files with a known-good baseline and continue monitoring for file changes, unexpected outbound traffic, and reinfection.
For broader cleanup guidance, see Sucuri’s hacked-website cleanup guide. A specialist is particularly important if there are signs of root or hosting-level access, multiple compromised stores, an unknown dwell time, or possible cardholder-data exposure. Incident notification duties depend on the facts, applicable law, and contracts.
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- Restrict administration: Limit SSH, SFTP, hosting-panel, VPN, and other administrative access to trusted networks where practical. Use strong MFA, audit authorized keys, and disable unused accounts. Sucuri specifically recommends restricting administrative protocols to trusted IP ranges in its incident report.
- Control production changes: Use reviewed, repeatable deployments rather than ad hoc editing of production PHP. Keep credentials short-lived and separate production access from routine development access.
- Monitor integrity and egress: Compare production files against a trusted baseline and alert on unexpected changes. Monitor outbound traffic from the web tier for unauthorized destinations.
- Harden the environment: Keep software current, minimize write permissions for the web user, separate application and administrative systems where practical, and maintain protected backups with tested restoration.
- Use layered defenses: A WAF or reverse proxy can block some malicious requests, but it cannot remove a hidden server-side file or rotate compromised credentials. CSP and payment-page monitoring can help detect unauthorized scripts when compatible with the checkout architecture.
- Consider checkout design: A payment-hosted or tokenized checkout may reduce the storefront’s exposure to raw card details, depending on the integration. It does not eliminate the need to secure the Magento server and checkout page.
When a scanner or managed cleanup service is appropriate
An external scanner can be a quick triage step for publicly visible issues or blacklist status, but it cannot prove that hidden server-side PHP, swap files, cron jobs, SSH keys, database injections, or authenticated-only behavior are clean. Sucuri’s SiteCheck scanner is one such external check; treat a clean result as limited evidence, not a forensic clearance.
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