alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Sarwent Initial Checkin"; flow:established,to_server; flowbits:set,ET.sarwent.1; http.method; content:"GET"; http.uri; content:"/gate/test"; bsize:10; fast_pattern; http.user_agent; content:"Opera"; startswith; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a|User-Agent|0d 0a|Accept|0d 0a 0d 0a|"; classtype:command-and-control; sid:2029474; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_17, deployment Perimeter, malware_family Sarwent, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_17;)