alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Webdor.NAC Variant CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".html?m="; content:"&c="; distance:0; content:"&v="; distance:0; content:"&myID="; content:"/"; within:255; content:"/"; within:10; http.user_agent; content:"Catalyst"; bsize:8; fast_pattern; reference:md5,1e2a28d5f4f03420df7a6766e0e4277c; classtype:trojan-activity; sid:2035456; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_15, deployment Perimeter, malware_family Win32_Webdor_NAC, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_15;)