alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Citrix App Delivery Controller and Citrix Gateway M1 (CVE-2019-19781)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/newbm.pl"; nocase; fast_pattern; endswith; http.header_names; content:"|0d 0a|NSC_USER|0d 0a|"; nocase; content:"|0d 0a|NSC_NONCE|0d 0a|"; nocase; http.request_body; content:"template.new"; nocase; content:"url="; nocase; reference:url,github.com/trustedsec/cve-2019-19781; reference:cve,2019-19781; classtype:attempted-admin; sid:2034279; rev:2; metadata:attack_target Server, created_at 2021_10_28, cve CVE_2019_19781, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_02_04, reviewed_at 2023_08_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)