alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA402/Molerats CnC Checkin"; flow:to_server,established; http.method; content:"POST"; http.uri; content:".php"; endswith; pcre:"/^\/[A-Za-z0-9]{30}\.php$/U"; http.header_names; content:!"Referer"; http.request_body; content:"aW50ZXJuYWwgY2xhc3M"; startswith; fast_pattern; content:"IHs"; distance:0; within:20; content:"cHVibGljIHN0cmluZw"; within:20; classtype:trojan-activity; sid:2035112; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_27, deployment Perimeter, malware_family Molerats, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_07;)