alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA457 Related Activity M3 (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/GO/"; startswith; content:".php"; endswith; http.user_agent; content:"Go-http-client/"; startswith; http.header; content:"|0d 0a|Authorization|3a 20|auth_token="; fast_pattern; http.request_body; content:"news="; startswith; content:"&request_for_read="; distance:0; http.header_names; content:!"Referer"; reference:md5,f8c29040122cf892190bcf3665975d2f; reference:url,research.checkpoint.com/2022/state-sponsored-attack-groups-capitalise-on-russia-ukraine-war-for-cyber-espionage/; classtype:trojan-activity; sid:2036758; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_06_02, deployment Perimeter, malware_family TA457, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_02;)