alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Backdoor Related Activity"; flow:established,to_server; http.protocol; content:"HTTP/1."; http.header; content:"user-agent|3a 20|mozilla/5.0"; fast_pattern; http.user_agent; content:"|3b 3b|"; content:"|3b 3b 2f|"; distance:0; content:"|2e|"; endswith; reference:md5,5c645e5dcb6bec4ab1bcb3f68421445a; classtype:trojan-activity; sid:2038973; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_09_26, deployment Perimeter, malware_family Gamaredon, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_26;)