alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Cisco Privilege Level 15 in HTTP Header (Outbound)"; flow:established,to_server; http.header; content:"|0d 0a|Priv-Level|3a 20|15|0d 0a|"; fast_pattern; threshold:type limit,seconds 300,count 1,track by_src; reference:url,blog.talosintelligence.com/active-exploitation-of-cisco-ios-xe-software/; reference:url,twitter.com/SI_FalconTeam/status/1718346358950711807; reference:cve,2023-20198; classtype:misc-activity; sid:2048937; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_10_30, cve CVE_2023_20198, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_30, reviewed_at 2023_10_30;)