alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lemon_Duck Powershell CnC Checkin M6"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".jsp?&"; fast_pattern; content:"&"; distance:0; content:"-"; distance:0; content:"&"; distance:0; content:"|3a|"; distance:2; within:1; content:"&"; distance:0; content:"&"; distance:0; content:"&"; distance:0; content:"&"; distance:0; content:"&"; distance:0; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; content:!"User-Agent"; content:!"Accept"; content:!"Referer"; reference:md5,293b4a6f18fdf5146b92e87e51cf8aa1; classtype:command-and-control; sid:2033020; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_24;)