alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP PUP/PUA OSSProxy HTTP Header"; flow:to_server,established; threshold:type limit, count 5, seconds 300, track by_src; http.header; content:"X-OSSProxy|3a 20|OSSProxy"; reference:url,www.marketscore.com; reference:url,www.spysweeper.com/remove-marketscore.html; classtype:policy-violation; sid:2001564; rev:13; metadata:created_at 2010_07_30, signature_severity Minor, updated_at 2020_08_13;)