alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/SPARS/ARS Stealer Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?action="; content:"&hwid="; distance:0; content:"&access="; fast_pattern; distance:0; http.header_names; content:!"Referer"; reference:md5,76516b465b3589547a9c7c7d955238d8; classtype:command-and-control; sid:2025344; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_02_12, deployment Perimeter, malware_family Ars_Stealer, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_24;)