I’ve published a new article on MSDN Wiki which explains how connectionstring details can be extracted from an existing SSIS package.
You can find the article in the below link
You can find the article in the below link
This approach can be used when you want to audit the existing SSIS packages and understand the details like connectionstrings its using, which SQLServer instances its trying to connect to etc and comes handy in maintenance projects where you inherit an existing system with no or little documentation.
Feel free to revert for any clarification