Create js_obfuscator.yar

malware/js_obfuscator.yar

+/*
+    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.
+
+*/
+rule jjEncode
+{
+   meta:
+      description = "jjencode detection"
+      ref = "http://blog.xanda.org/2015/06/10/yara-rule-for-jjencode/"
+      author = "adnan.shukor@gmail.com"
+      date = "10-June-2015"
+      version = "1"
+      impact = 3
+      hide = false
+   strings:
+      $jjencode = /(\$|[\S]+)=~\[\]\;(\$|[\S]+)\=\{[\_]{3}\:[\+]{2}(\$|[\S]+)\,[\$]{4}\:\(\!\[\]\+["]{2}\)[\S]+/ fullword 
+   condition:
+      $jjencode
+}