JS_BLACOLE.GO

August 24, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:JS/BlacoleRef.BG (Microsoft), JS/Exploit-Blacole.eu (McAfee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be hosted on a website and run when a user accesses the said website.

It inserts an IFRAME tag that redirects users to certain URLs.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

HTML, HTM

Initial Samples Received Date:

17 Aug 2012

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Other Details

This Trojan inserts an IFRAME tag that redirects users to the following URLs:

  • http://{pseudorandom}.ru/runforest?sid=botnet

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.338.04

FIRST VSAPI PATTERN DATE:

21 Aug 2012

VSAPI OPR PATTERN File:

9.339.00

VSAPI OPR PATTERN Date:

22 Aug 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Close all opened browser windows

Step 3

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