alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT FlashPack Secondary Landing Oct 29"; flow:established,from_server; file_data; content:"Windows%20"; within:10; content:"<br>|0d 0a|"; within:10; pcre:"/^\d/R"; content:"FlashVars=|22|exec="; pcre:"/^(?!687474703a2f2f)(?P<h>[a-f0-9]{2})(?P<t>[a-f0-9]{2})(?P=t)(?P<p>[a-f0-9]{2})(?P<colon>[a-f0-9]{2})(?P<slash>[a-f0-9]{2})(?P=slash)/R"; classtype:trojan-activity; sid:2019596; rev:2; metadata:created_at 2014_10_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)