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JS_DLOADER.MEX

March 01, 2013
 Analysis by: Rhena Inocencio
 ALIASES:

Exploit:JS/Blacole.KH (Microsoft), Trojan-Downloader.JS.Expack.aie (Kaspersky)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


This Trojan may be hosted on a website and run when a user accesses the said website.

It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

JS

Initial Samples Received Date:

28 Feb 2013

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}musi.ru

NOTES:

It loads the following URLs where a malicious Java is hosted:

Java version below 1.7.0_09:

  • http://{hosted site}/closest/df7guhoijewpgkegwegko.php?jnollhfx=kvlfps&hfa=cnxdj
  • http://{hosted site}/98y7y432ufh49gj23sldkkqowpsskfnv.php?tluhe=mzgegs&vvzh=cijwqqet

Java version below 1.6 or 1.6.0_33

  • http://{hosted site}/df7guhoijewpgkegwegko.php?pypbyn=omkaiwon&kip=gltmdl
  • http://{hosted site}/98y7y432ufh49gj23sldkkqowpsskfnv.php?hqi=nwambtrx&xovxj=aohixl

The malicious Java is detected as JAVA_ARCAL.A

The following sites redirects users to sites where this malicious script is hosted:

  • http://{BLOCKED}meer.nl/templates/beez/i.php?pprec
  • http://www.{BLOCKED}otel.kz/templates/beez/i.php?c002

This Trojan may be hosted on the following websites:

  • http://{BLOCKED}removalonly.org/closest/{random value}.php
  • http://{BLOCKED}owinggopayment.net/closest/{random value}.php
  • http://{BLOCKED}selse.org/closest/{random value}.php

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.758.02

FIRST VSAPI PATTERN DATE:

28 Feb 2013

VSAPI OPR PATTERN File:

9.759.00

VSAPI OPR PATTERN Date:

01 Mar 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_DLOADER.MEX. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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