alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Sehyioa Variant Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?r=cmd"; endswith; fast_pattern; http.header_names; content:!"Referer"; reference:md5,e47a296bac49284371ac396a053a8488; reference:url,www.group-ib.com/blog/oldgremlin; classtype:trojan-activity; sid:2030904; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_09_23, deployment Perimeter, malware_family Win32_Sehyioa, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_23;)