alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS sysWeb User-Agent"; flow:established,to_server; http.user_agent; content:"|20|sysWeb/"; fast_pattern; reference:md5,3f295401fa59a32ff7a11551551ec607; reference:url,twitter.com/starsSk87264403/status/1422543872853426198; classtype:trojan-activity; sid:2033665; rev:1; metadata:created_at 2021_08_04, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_04;)