Rule History

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Sarwent Initial Checkin CnC Response"; flow:established,from_server; flowbits:isset,ET.sarwent.1; http.stat_code; content:"200"; http.response_body; content:"|20|IP|20|"; pcre:"/^[^\x20-\x7e\r\n]/R"; content:"|20 2e 20 2e 20 2e 20 2e 20 2e 20|"; within:50; content:"DNS-"; distance:0; pcre:"/^[^\x20-\x7e\r\n]/R"; content:"|20 2e 20 2e 20 2e 20 3a 20|"; distance:0; pcre:"/^(?:[a-f0-9]{2}-){5}[a-f0-9]{2}/R"; content:"|0d 0a 20 20 20|DHCP|20|"; within:10; fast_pattern; classtype:command-and-control; sid:2029475; 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_08_19;)