alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BazaBackdoor Variant CnC Activity M4"; flow:established,to_server; urilen:36; http.method; content:"POST"; http.uri; content:!"."; content:!"?"; content:!"="; content:!"&"; pcre:"/^\/[a-z0-9]{32}\/\d\/$/i"; http.cookie; content:"group="; depth:6; isdataat:!2,relative; fast_pattern; pcre:"/^\d$/R"; reference:url,twitter.com/lazyactivist192/status/1364668631460827142; reference:md5,8488d9be18308a7f4e83b7c39fc79d17; classtype:command-and-control; sid:2031673; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_02_25, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_03, reviewed_at 2024_01_02;)