I'm from Mexico so it might not be as useful but my ISP is Cablevision. The only proof I've got is that it was an iframe inserted into non related pages from th

I'm from Mexico so it might not be as useful but my ISP is Cablevision. The only proof I've got is that it was an iframe inserted into non related pages from their server and for a specific offer they were making. I really doubt it was any form of local malware.