alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CURRENT_EVENTS Possible WhiteLotus IE Payload"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?"; fast_pattern; startswith; pcre:"/^\/\?[A-Za-z0-9]+=(?P<v1>[^&]+)&(?P=v1)=[A-Za-z0-9]+$/"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; http.user_agent; content:"|20|MSIE|20|"; classtype:trojan-activity; sid:2017743; rev:5; metadata:created_at 2013_11_22, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_23;)