PhpBB is a very popular software to use for internet boards/forums, so this affects a lot of sites. The worm is extra tricky because it replaces asp/php/htm/shtm files with its own code. There is no patch for this problem, only a work-around, which can be found here. Currently no patch is available for this worm, but it can be used to replace files on other sites using the same host asp/.php/http://://www.com/phpBB.”]
Source: https://securelist.com/net-worm-perl-santy-a-outbreak/29915/