alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO LNK File Downloaded via HTTP"; flow:established,to_client; file_data; content:"|01 14 02 00 00 00 00 00 c0 00 00 00 00 00 00 46|"; fast_pattern; offset:4; depth:16; reference:url,learn.microsoft.com/en-us/openspecs/windows_protocols/ms-shllink/c3376b21-0931-45e4-b2fc-a48ac0e60d15; classtype:misc-activity; sid:2048508; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_10_10, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_10, reviewed_at 2023_10_10;)