alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO PK/Compressed doc/JAR header"; flow:established,to_client; flowbits:set,ET.zipfile; flowbits:noalert; file.data; content:"|50 4B 03 04|"; startswith; classtype:misc-activity; sid:2022055; rev:6; metadata:created_at 2015_11_10, deprecation_reason Relevance, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_24;)