Loaded Commerce Community

Hi everybody, since several days, we have a big problem with certain websites. Our version of Oscommerce is : CRE Loaded6 v4 Fr Sp1.2 RC2. The website, himself, don't reveal any problems but when we put http://my.website/whatsoever in the address bar, the website is automatically redirect to companyupdate.ru, we suppose that's a hacker website. We have already established a software in the websites to protect against Sql injection, XSS injection ... and we have clean .htaccess. We've also made several searches about malicious scripts in base 64 or others in the files but with not success. We've taken notes about the security methods of Oscommerce, we changed the name of admin directory and created a .htaccess to protect the directory.
Do you have an idea of ​​which could be the cause of this problem?

Cause of problem = hacked = using a very old version of the cart (CRE Loaded6 v4 Fr Sp1.2 RC2 ????!!!!)
Solution = shift hosting companies, upgrade.

Simon

Agreed - a check on PHP_SELF or PHPSELF may also be helpful in helping prevent penetrations in any CRE Loaded site older than 6.4.1

David