alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lemon_Duck Linux Shell Script CnC Activity"; flow:established,to_server; http.uri; content:"/ln/a.asp?"; startswith; fast_pattern; content:"_"; distance:0; reference:url,github.com/sophoslabs/IoCs/blob/master/Trojan-LDMiner.csv; classtype:command-and-control; sid:2030826; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_09_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_02;)