alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Bitter APT CHM Activity (GET) M3"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php/?h="; offset:10; depth:18; fast_pattern; content:"|2a|"; distance:0; http.user_agent; content:"Windows Installer"; bsize:17; reference:md5,1fa66d93db415a90e1ba6b09a53cc694; classtype:trojan-activity; sid:2041670; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_12_02, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_23, reviewed_at 2024_09_23;)