alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE STRRAT Initial HTTP Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?lid="; fast_pattern; content:"-"; distance:4; within:1; content:"-"; distance:4; within:1; pcre:"/\.php\?lid=[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}$/"; http.user_agent; content:"Java/"; startswith; http.header_names; content:!"|0d 0a|Referer"; content:!"|0d 0a|Cache-"; content:!"|0d 0a|Pragma"; reference:md5,bef4a453c819a453c255569c368972ea; reference:url,gdatasoftware.com/blog/strrat-crimson; classtype:command-and-control; sid:2030359; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_19, deployment Perimeter, malware_family STRRAT, confidence High, signature_severity Major, updated_at 2024_03_10;)