This detection rule identifies potentially malicious attempts to update Adobe Flash Player from unofficial sources. The detection is based on web proxy logs, specifically monitoring the Uniform Resource Identifier (URI) for requests that suggest a Flash Player installation. The rule looks for URIs that contain '/flash_install.php' or end with '/install_flash_player.exe', while filtering out legitimate requests coming from the official Adobe domain. The logic behind the rule is to flag any match from the selection that does not originate from Adobe's official website, which could indicate an attempt to leverage outdated or malicious Flash Player updates to achieve unauthorized access or execution within a system. Given that Flash Player has been targeted in numerous attacks, any update attempt from suspicious locations warrants investigation, especially since Flash has been deprecated in modern environments.