alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Shamoon V3 CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?selection="; http.user_agent; content:"Mozilla/13.0|20 28|MSIE|20|7.0|3b 20|Windows|20|NT|20|6.0|29|"; fast_pattern; endswith; http.header_names; content:!"Referer"; reference:url,researchcenter.paloaltonetworks.com/2018/12/shamoon-3-targets-oil-gas-organization/; classtype:command-and-control; sid:2026730; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_12_14, deployment Perimeter, malware_family DistTrack, malware_family Shamoon, performance_impact Low, confidence High, signature_severity Major, tag APT, tag Wiper, updated_at 2020_09_16;)