alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/G2 Stealer/GravityRAT CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?Value="; content:"UserCode="; distance:0; content:"MacId="; distance:0; content:"HitDate="; distance:0; content:"FingerPrint="; distance:0; fast_pattern; content:"CurrentIp="; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|user-agent|0d 0a|"; content:!"cache"; content:!"|0d 0a|connection|0d 0a|"; reference:md5,6899c2219764bac56007ce80021bfcbf; reference:url,blog.talosintelligence.com/2018/04/gravityrat-two-year-evolution-of-apt.html; classtype:command-and-control; sid:2025540; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_04_26, deployment Perimeter, malware_family GravityRAT, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)