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php.backdoor.gzinflate.002

Backdoors are pieces of code that allow attackers to bypass authentication, maintain their access to the server and reinfect files. Some of those malicious files can be as simple as a single line of code, allowing the execution of remote code, or complex algorithms, providing different functions to the attacker.

gzinflate() function is another function commonly used for compressing the payload to make it smaller and more compact. It's also not possible to directly see the code in such compressed payload.

Affecting

Any PHP based web site (often through outdated WordPress, Joomla, osCommerce, Magento, Drupal and stolen passwords).

Cleanup

Cleanup is done by deleting the malicious file, which can be found in your system by searching for the dump code below inside your files. Reviewing access logs for non-expected HTTP POSTs can point out the possible infected files.
You can also sign up with us and let our team remove the malware for you.\';

Dump

Part of a malicious script using gzinflate() function:

"ev"."al(gzi"."nflate(b"."ase6"."4_dec"."ode('lVZtU+JIEP4sv2KcQ'.'pNsRV5OQHdZXCjN'.'7Vqn4EW4qjvx...