We have an Oscommerce site which has been compromised on multiple occasions, different files have been modified in multiple ways, we've managed to sort it out each time and have cleaned infected files etc... and tried to clamp down on the security but the problem is persistent, because the attacks dont seem to have much in common I would believe that they're different vulnerabilities / back doors that are being used.
The latest attack has left our website with this error from Google:
We've not been able to track it down partly because we dont have the relevant PHP skills.
So what we're looking for is for someone to sort this out, then secure our server so that it does not happen again.
We cannot simply apply patches as a lot of the files have been edited by hand.
We're located in South Africa and are under pressure to get this resolved.