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JS_BLACOLE.MZ

May 20, 2013
 Analysis by: Rhena Inocencio
 ALIASES:

Trojan.Malscript (Symantec), Trojan.JS.Obfuscator.w (Sunbelt)

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

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Initial Samples Received Date:

20 May 2013

Payload:

Connects to URLs/IPs

Arrival Details

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

NOTES:

It connects to any of the following sites to load a PDF:

For PDF versions below 8:

  • http://{BLOCKED}nweb.com/news/unpleasant-near_finally-events.php?hjfiy=0f5c0&mtfilk=qya&lvygz=2v:1i:2w:2v:1k:1n:1h:1f:33:1l&kjlzf={pdfver}

For PDF versions 8 or below 9.4:
  • http://{BLOCKED}nweb.com/news/unpleasant-near_finally-events.php?syszin=0f5c0&pztsuf=l&wumhx=2v:1i:2w:2v:1k:1n:1h:1f:33:1l&dgmq={pdfver}

For Adobe Flash version 10.0.40, below 10.10.2 or 10.2.159:

  • http://{BLOCKED}nweb.com/news/unpleasant-near_finally-events.php?riou=0f5c0&uyfu=dltaoa&mps=2v:1i:2w:2v:1k:1n:1h:1f:33:1l&info=02e67fbb1b70fa5a767caa699392156a675f441f1b42adb2df 0e81a45194cc685f32d4aab3539cc1eb88968ed073d93947529943b4315b887f64d6a4d96fa14ba0cc861ae863 0a

For Adobe Flash version 10.2.181 and below or 10.3.181 and below:
  • http://{BLOCKED}nweb.com/news/unpleasant-near_finally-events.php?ucxcxvu=0f5c0&evzrp=pujv&azvpahpu=2v:1i:2w:2v:1k:1n:1h:1f:33:1l&pddhhfpe=damney

It connects to the following site to load a .JAR file:

  • http://{BLOCKED}nweb.com/news/unpleasant-near_finally-events.php?xdoovb=ronpgv&qzfxmb=hjdwq

The following parameters are passed:

parameter name: val
value: Dyy3Ojj?V-%qVo_e?w%t0joe_ijKo3-eViVoymo
parameter name: prime
value: eVlN.8oV--Smeveoyiw3D3xe.b6.O11O6qO1fO6.RCebhvO68Oh_OhvO6qO6oO6DO6.O11O6-Rkb6.RekbURvybk

After performing its intended routine, it redirects users to the following site:

  • http://google.com/search?q=wallmart

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.930.02

FIRST VSAPI PATTERN DATE:

20 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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_BLACOLE.MZ. 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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