alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Turla APT Kazuar Backdoor Related Activity"; flow:established,to_server; http.method; content:"POST"; http.cookie; content:"AspNet.Cookies="; fast_pattern; startswith; http.request_body; content:"<"; startswith; http.header_names; content:"|0d 0a|Referer|0d 0a|Content-Type|0d 0a|"; startswith; content:!"Accept"; reference:url,unit42.paloaltonetworks.com/pensive-ursa-uses-upgraded-kazuar-backdoor/; classtype:trojan-activity; sid:2049861; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_27, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_27; target:src_ip;)