alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lemon_Duck Powershell CnC Activity M15"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".jsp?"; content:"_"; distance:0; content:"*"; distance:0; http.host; content:"t."; startswith; fast_pattern; pcre:"/^[a-z0-9]{5}\.com$/R"; http.header_names; content:!"Referer"; content:!"User-Agent"; content:!"Accept"; classtype:command-and-control; sid:2033021; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_24, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_10;)