alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Fortigate THINCRUST Backdoor Activity M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/p/utils/fortigate_syslog_send"; fast_pattern; http.cookie; content:"DEVICEID"; content:"FGMGTOKEN"; reference:url,www.mandiant.com/resources/blog/fortinet-malware-ecosystem; classtype:trojan-activity; sid:2044679; rev:1; metadata:affected_product Fortigate, attack_target Networking_Equipment, created_at 2023_03_17, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_17;)