alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected APT43 BITTERSWEET Related Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?v="; fast_pattern; pcre:"/^[0-9A-F]{12}$/R"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|"; startswith; content:!"Referer|0d 0a|"; http.user_agent; content:"Mozilla/5.0|20|"; startswith; reference:md5,cd83a51bec0396f4a0fd563ca9c929d7; reference:url,mandiant.widen.net/s/zvmfw5fnjs/apt43-report; classtype:trojan-activity; sid:2044823; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_29, deployment Perimeter, performance_impact Moderate, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_29; target:src_ip;)