[ SEA-GHOST MINI SHELL]

/*
   Yara Rule Set
   Author: Brian Laskowski
   Date: 2018-09-06
   Identifier: shell4
   Reference: https://github.com/Hestat/lw-yara/
*/

/* Rule Set ----------------------------------------------------------------- */

rule infected_09_06_18_shell4_stats5 {
   meta:
      description = "shell4 - file stats5.php"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-09-06"
      hash1 = "8053c1ced5fe5f93dded31afdda01c9469be7bb025fdd2cd192903c4fccec40f"
   strings:
      $s1 = "ZXJyb3JfcmVwb3J0aW5nKDApOyBpZiAoaXNzZXQoJF9QT1NUWydjb29raWVzX2UnXSkpIHtldmFsKGJhc2U2NF9kZWNvZGUoJF9QT1NUWydjb29raWVzX2UnXSkpO30g" /* base64 encoded string */
      $s2 = "@error_reporting(0); @eval(base64_decode(" ascii
      $s3 = "<?php" ascii
   condition:
      ( uint16(0) == 0x3f3c and
         filesize < 1KB and
         ( all of them )
      ) or ( all of them )
}