alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TransparentTribe APT Maldoc CnC Checkin"; flow:established,to_server; threshold:type limit, count 1, seconds 60, track by_src; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"relay=y"; startswith; fast_pattern; endswith; http.content_type; content:"application|2f|x-www-form-urlencoded"; http.header_names; content:!"Referer"; content:!"Connection"; content:!"Accept"; reference:url,mp.weixin.qq.com/s/pJ-rnzB7VMZ0feM2X0ZrHA; classtype:targeted-activity; sid:2028569; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag TransparentTribe, updated_at 2020_09_17;)