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Recognizing a Reinfection Pattern in a Compromised Evolution CMS Site
A practical security note on repeated malware cleanup when one obvious infected file is only part of the real problem.
One of the most dangerous moments in incident response is when a site appears clean for a few hours and then becomes compromised again. That usually means the visible infected file was only one symptom, not the persistence mechanism.
The source example showed a malicious rewrite rule redirecting requests into assets/config.php and an obfuscated payload wrapped in compressed, base64-decoded PHP. That is a classic sign of reinfection rather than a one-time corruption.
What to do first
- Do not clean only the visible injected file.
- Audit writable directories, admin credentials, scheduled tasks, and upload points.
- Replace compromised core files from a trusted source.
- Rotate passwords and review server logs for the initial entry path.
Why this matters
If a malicious rewrite or payload reappears, some foothold is still active. Treat the event as a full security incident, not as a formatting or file-corruption issue.
For older Evo sites especially, proper cleanup means source replacement, credential rotation, and path review together. Otherwise the same infection just comes back in a slightly different shape.
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