alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE LNK/Agent.GX CnC Traffic"; flow:established,to_server; http.method; content:"GET"; http.header; content:!"Referer"; content:"UA-CPU"; http.uri; pcre:"/^\/[a-zA-Z0-9+=]{29,44}.{0,8}=$/U"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 10.0|3b 20|Win64|3b 20|x64|3b 20|Trident|2f|7.0|3b 20|.NET4.0C|3b 20|.NET4.0E|3b 20|.NET CLR 2.0.50727|3b 20|.NET CLR 3.0.30729|3b 20|.NET CLR 3.5.30729)"; bsize:156; fast_pattern; reference:md5,4b9eb054d9f7f5dd8c23cc1d7312013c; classtype:trojan-activity; sid:2034410; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_09, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_09;)