Upgrading 1. Documentation The "J1. This page contains information for a Joomla! It is risky to upgrade a live site without testing the upgrade process first.
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If you would like to make the logs available, they could be analyzed and a definite determination made as to how the attackers got in. Viruses on PCs are quite common these days as the anti-virus companies have been using "generic" signatures in an effort to try and keep up with the many viruses created.
I would disable that username in your FTP acccounts for now, clean all the files and also look for. Many times they are found in the images folder. The reason is, the virus must know by know how to avoid detection of the currently installed anti-virus program.
So something different needs to be installed. Again, if one of these is already being used, then they must install one of the others. The virus works in a variety of ways. First, it knows where Filezilla and many other FTP programs store their plain text usernames and passwords.
All the virus does is look for those files, opens them, steals the usernames and passwords and sends them to a server that carries out the infection of the available websites. If none of the IP addresses are from an area where the developer works, then you can safely assume that the attackers somehow stole that username and password. Or if the infected index. I really do think that this type of infection is from a compromised FTP account. But like I said, following the other security steps is also a good idea and strongle recommended.
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Upgrading 1.5 from an existing 1.5x version