alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Agent.TRM Data Exfil (sysinfo)"; flow:established,to_server; http.method; content:"POST"; http.start; content:"Cookie|3a 20|dkv="; fast_pattern; http.cookie; content:"dkv="; startswith; content:"|3b|YSC="; distance:32; within:5; pcre:"/^dkv=[a-f0-9]{32}\x3bYSC=\d+$/C"; http.header_names; content:!"Referer"; content:!"Content-Type"; http.request_body; content:"DQpIb3N0IE5hbWU6"; startswith; reference:md5,d2b81c4f5d075daa681f823cc9a5e4c0; reference:url,twitter.com/w3ndige/status/1247547923845578755; classtype:command-and-control; sid:2029855; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_09, deployment Perimeter, deployment SSLDecrypt, malware_family MSIL_Agent_TRM, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_31;)