alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Observed POST to xsph .ru Domain"; flow:established,to_server; http.method; content:"POST"; http.host; content:".xsph.ru"; endswith; fast_pattern; http.header_names; content:!"Referer"; classtype:bad-unknown; sid:2032531; rev:1; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2021_04_08, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2021_04_08;)