Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike CnC Beacon (POST)"; flow:established,to_server; urilen:12; http.method; content:"POST"; http.uri; content:"/mobile-home"; fast_pattern; http.accept; content:"|2a 2f 2a|"; http.content_type; content:"text/plain"; bsize:10; http.cookie; content:"|5f 5f|session|5f 5f|id|3d|"; startswith; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; http.connection; content:"Close"; http.header; content:"Cache-Control|3a 20|no-cache|0d 0a|"; http.host; content:!"google.com"; reference:url,thedfirreport.com/2023/05/22/icedid-macro-ends-in-nokoyawa-ransomware; classtype:trojan-activity; sid:2045857; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_24, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_24;)