I am a part of a security company. Would keep this real quick, since last few days we've seen rise in Joomla hack situations. Possibly, the cause is LDAP Injection vulnerability which was released some time ago.
Here's a quick suggestion, it is advised to update your Joomla version to 3.8 as 1.5.0 through 3.7.5 all versions are vulnerable.
More information with video demo: https://www.getastra.com/blog/cms/jo...vulnerability/
Hope this helps!
Are you sure your are posting in product assigned forum?
What is your CMS version?
: Joomla 2.5
Link to installation
Have you edited any files? If yes tell us which ones.
Is this personal or client website?