// Copyright 2021 by FireEye, Inc.
// You may not use this file except in compliance with the license. The license should have been received with this file.

rule FE_Trojan_SH_ATRIUM_1
{
    meta:
        author = "Mandiant"
        date_created = "2021-04-16"
        md5 = "a631b7a8a11e6df3fccb21f4d34dbd8a"
        reference_url = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
    strings:
        $s1 = "CGI::param("
        $s2 = "Cache-Control: no-cache"
        $s3 = "system("
        $s4 = /sed -i [^\r\n]{1,128}CGI::param\([^\r\n]{1,128}print[\x20\x09]{1,32}[^\r\n]{1,128}Cache-Control: no-cache[^\r\n]{1,128}print[\x20\x09]{1,32}[^\r\n]{1,128}Content-type: text\/html[^\r\n]{1,128}my [^\r\n]{1,128}=[\x09\x20]{0,32}CGI::param\([^\r\n]{1,128}system\(/
    condition:
        all of them
}