alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING SUSPICIOUS .LNK File Inside of Zip"; flow:established,to_client; file.data; content:"PK|03 04|"; startswith; content:".lnk"; nocase; fast_pattern; within:500; classtype:unknown; sid:2035026; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_01, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)