An article in As Sharq Al Awsat says:
كما يقول المثل رب ضارة نافعة
The article is about arms dealers in Syria so I imagine it has to do with profiting from suffering but what does the proverb mean exactly? Shukran!
According to the Wiktionary page for the English phrase[1], 'every cloud has a silver lining' is equivalent to (رب ضارة نافعة). Might this expression work?