alert tcp $HOME_NET any -> any $HTTP_PORTS (msg:"🐾 - 🔥👁 FireEye - Backdoor.HTTP.BEACON.[Yelp GET]"; flow:to_server; content:"GET "; depth:4; content:"&parent_request_id="; distance:0; within:256; fast_pattern; content:" HTTP/1"; distance:0; within:1024; content:"|0d 0a|Sec-Fetch-Dest: empty|0d 0a|"; distance:0; within:256; content:"request_origin=user"; offset:0; depth:256; pcre:"/^GET [^\r\n]{0,256}&parent_request_id=(?:[A-Za-z0-9_\/\+\-%]{128,1024})={0,2}[^\r\n]{0,256} HTTP\/1\.[01]/"; reference:url,https://www.fireeye.com/blog/products-and-services/2020/12/fireeye-shares-details-of-recent-cyber-attack-actions-to-protect-community.html; reference:url,https://www.fireeye.com/blog/threat-research/2020/12/unauthorized-access-of-fireeye-red-team-tools.html; reference:url,https://github.com/fireeye/red_team_tool_countermeasures; metadata:created_at 2020_12_11, updated_at 2020_12_11; sid:3309553; rev:1; classtype:trojan-activity;)