alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT28 Uploader Variant Fake Request to Google"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"."; content:"/?"; distance:0; content:"="; distance:1; within:3; pcre:"/\/\?[a-zA-Z0-9]{1,3}=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header; content:"Content-Length|3a 20|0|0d 0a|"; fast_pattern; http.host; content:"google.com"; bsize:10; http.header_names; content:!"Content-Type|0d 0a|"; content:!"Referer|0d 0a|"; content:!"Accept"; classtype:targeted-activity; sid:2023917; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_07, deployment Perimeter, malware_family APT28_Uploader, performance_impact Significant, signature_severity Major, updated_at 2024_04_30;)