alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 Amazon Profile POST (PNG)"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"/s/ref=nb_sb_noss_1/167-3294888-0262949/field-keywords=books"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; http.request_body; content:"|89 50 4e 47|"; startswith; reference:url,securelist.com/ghostemperor-from-proxylogon-to-kernel-mode/104407/; classtype:command-and-control; sid:2034085; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_01, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_01;)