More on our research, the exploit has been almost over a year now, and cyber criminals still using it in the wild. We found out that about 30% of Joomla! users are still working on the targeted version.
We also discovered that it is not that easy to migrate from Joomla! 1.5 to the latest. The blame was put on the developers of Joomla! for not providing an easy path to upgrade to the latest version of the popular CMS. Developers, need to migrate it meticulously or at least built from scratch to upgrade to the new version. Third party tools have been developed for this migration but do not perform to anyone's expectation causing massive errors on the site after the upgrade.
However, it is better to go through the upgrade hassle and block hackers before they destroy, install ransomware blocking access to your files
or even take your site down permanently due to malware distribution.