Analysis by: Anthony Joe Melgarejo
ALIASES:

Exploit:JS/Blacole.GB (Microsoft), JS/Exploit-Blacole.gq !! (McAfee), JS/Kryptik.AGF trojan (ESET), Mal/ExpJS-N (Sophos), Exploit.JS.Blacole (Ikarus)

 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:

  • In the wild: Yes

  OVERVIEW

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

This is the Trend Micro detection for files that contain a malicious script.

  TECHNICAL DETAILS

File Size: 116,071 bytes
File Type: HTML, HTM
Initial Samples Received Date: 07 Feb 2013

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.252.128/9891215e787fe4eaac9d4548fae056b2/9891215e787fe4eaac9d4548fae056b2/q.php

It saves the files it downloads using the following names:

  • %User Temp%\wpbt0.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This is the Trend Micro detection for files that contain a malicious script.

It executes the downloaded file using the following commands:

  • %User Temp%\wpbt0.dll
  • regsvr32 -s %User Temp%\wpbt0.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.712.08
FIRST VSAPI PATTERN DATE: 08 Feb 2013
VSAPI OPR PATTERN File: 9.713.00
VSAPI OPR PATTERN Date: 08 Feb 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

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\wpbt0.dll

Step 4

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