There is lots of different stuff ‘all over the internet’. For example:
Assad’s Forces May Be Aiding New ISIS Surge
http://www.nytimes.com/2015/06/03/world ... .html?_r=0
Assad Policies Aided Rise of Islamic State Militant Group
http://www.wsj.com/articles/assad-polic ... 1408739733
U.S. embassy in Syria accuses al-Assad of helping Islamic State
http://www.upi.com/Top_News/World-News/ ... 433244005/
Insurgents claim Assad aiding Islamic State group
http://www.seattletimes.com/nation-worl ... ate-group/
I am not saying it is necessarily true, just because it is on the internet, even if all of the above quotes come from gilt-edged sources, but it is an angle that merits serious consideration, and I think the reality is far too complex to allow for any single simple conspiracy theory.