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Threat Encyclopedia

JS_EXPLOIT.MEA

ANALYSIS BY

Rhena Inocencio


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

Infection Channel:

Downloaded from the Internet


This malicious script was inserted onto a legitimate website of the US Department of Labor and downloads a Poison Ivy backdoor.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan executes when a user accesses certain websites where it is hosted.

TECHNICAL DETAILS

File Size:

12,006 bytes

File Type:

Script

Initial Samples Received Date:

02 May 2013

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}l.{BLOCKED}1.us:8081/bookmark.png - detected as BKDR_POISON.MEA

NOTES:

This Trojan is hosted from the following website:

  • http://{BLOCKED}l.{BLOCKED}1.us:8081/update/index.php

It loads the following sites where its component for decoding base64 can be found:

  • http://{BLOCKED}l.{BLOCKED}1.us:8081/update/base64.js

It takes advantage of the following vulnerability in Internet Explorer (IE) 8 to download the malicious file:

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.892.07

FIRST VSAPI PATTERN DATE:

03 May 2013

VSAPI OPR PATTERN File:

9.893.00

VSAPI OPR PATTERN Date:

03 May 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

Remove malware/grayware files dropped/downloaded by JS_EXPLOIT.MEA

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_EXPLOIT.MEA. 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.

Step 5

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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