alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Blister Loader Cobalt Strike C2 Profile M4"; flow:established,to_server; http.method; pcre:"/^(GE|POS)T$/"; http.uri; content:"/safebrowsing/b0kKKIjr/"; startswith; fast_pattern; http.host; content:!"safebrowsing.googleapis.com"; content:!"sb.google.com"; content:!"www.google.com"; reference:url,blog.fox-it.com/2023/11/01/popping-blisters-for-research-an-overview-of-past-payloads-and-exploring-recent-developments/; classtype:trojan-activity; sid:2049978; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_10, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_10_03, reviewed_at 2024_10_03; target:src_ip;)