alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Plugx CnC Activity (CONNECT)"; flow:established,to_server; http.method; content:"CONNECT"; http.uri; content:"/update?id="; startswith; fast_pattern; http.user_agent; bsize:30; content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|MSIE|20|"; http.content_len; bsize:1; content:"0"; http.content_type; content:"text/html"; http.header; header_lowercase; content:"proxy-connection|3a 20|Keep-Alive"; content:"proxy-authorization|3a 20|Basic|20|"; reference:url,twitter.com/StopMalvertisin/status/1628426658956075011; reference:md5,e832281f64504e3dce46860b605116a9; classtype:trojan-activity; sid:2044311; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_23, deployment Perimeter, malware_family Win32_PlugX, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, reviewed_at 2023_11_17;)