alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Observed nc (netcat) EXE Inbound"; flow:established,to_client; file.data; content:"MZ"; depth:10; content:"!This program"; distance:0; content:"www.vulnwatch.org/netcat/"; distance:0; fast_pattern; content:"nc [-options]"; distance:0; content:"nc -l -p port"; distance:0; reference:md5,e0db1d3d47e312ef62e5b0c74dceafe5; classtype:policy-violation; sid:2033890; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_02, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03, reviewed_at 2024_05_07;)