alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bitter APT Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?h="; fast_pattern; content:"|2a|"; distance:0; http.user_agent; bsize:17; content:"Windows Installer"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,1d7d9b2c46bd733f5270d34c4dd748e9; reference:url,twitter.com/h2jazi/status/1491852987324637185; classtype:trojan-activity; sid:2035180; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_02_11, deployment Perimeter, malware_family Bitter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30;)