alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ReverseRat 3.0 CnC Checkin M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"."; content:!"&"; content:!"="; http.request_body; content:"|3b 83 8f bc 30 b7 0d a6 4a 90|"; startswith; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|User-Agent|0d 0a|"; reference:md5,0baa1d0cc20d80fa47eeb764292b9e98; reference:url,threatmon.io/apt-sidecopy-targeting-indian-government-entities/; reference:url,twitter.com/souiten/status/1620629752863404032; classtype:command-and-control; sid:2044379; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_02_28, deployment Perimeter, malware_family ReverseRAT, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_28; target:src_ip;)