alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY I2P Seeds File Download"; flow:established,to_client; file_data; content:"I2Psu3"; within:6; reference:url,phishme.com/dyre-attackers-shift-tactics/; classtype:policy-violation; sid:2020416; rev:2; metadata:created_at 2015_02_12, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)