alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT-C-23 Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/mehro"; endswith; fast_pattern; http.request_body; content:"celal="; startswith; content:"&type="; distance:0; content:"&value="; distance:0; http.header_names; content:!"Referer"; content:!"Accept"; content:!"Connect"; reference:md5,738886d83e8dc379fc463e3869c74217; classtype:trojan-activity; sid:2033200; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_28;)