// 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_APT_Trojan_PL_RADIALPULSE_2 
{ 
    meta: 
        author = "Mandiant"  
        date_created = "2021-04-16"       
        md5 = "4a2a7cbc1c8855199a27a7a7b51d0117"
        reference_url = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
    strings: 
        $s1 = "open(*fd," 
        $s2 = "syswrite(*fd," 
        $s3 = "close(*fd);" 
        $s4 = /open\(\*fd,[\x09\x20]{0,32}[\x22\x27]>>\/tmp\/[\w.]{1,128}[\x22\x27]\);[\x09\x20]{0,32}syswrite\(\*fd,[\x09\x20]{0,32}/ 
        $s5 = /syswrite\(\*fd,[\x09\x20]{0,32}[\x22\x27][\w]{1,128}=\$\w{1,128} ?[\x22\x27],[\x09\x20]{0,32}5000\)/ 
    condition: 
        all of them 
}