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JS_BLACOLE.ERZ

October 09, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Exploit:JS/Blacole.GB (Microsoft)

 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

Infection Channel:

Downloaded from the Internet

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

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

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

  TECHNICAL DETAILS

File Size:

Varies

File Type:

HTML, HTM

Initial Samples Received Date:

28 Aug 2012

Payload:

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}.{BLOCKED}.112.81/p.php?f=dd9d6&e=2

It saves the files it downloads using the following names:

  • {malware's parent path name}\e3ab935.exe

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}00.net/updateflashplayer.exe

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

  • {host website}/data/ap1.php?f=dd9d6 - detected by Trend Micro as TROJ_PIDIEF.ERZ
  • {host website}/data/ap2.php - detected by Trend Micro as TROJ_PIDIEF.ERZ
  • {host website}/data/hhcp.php?c=dd9d6

NOTES:

This Trojan downloads and executes the file at http://{BLOCKED}.{BLOCKED}.112.81/p.php?f=dd9d6&e=2 by passing an encrypted version of the URL as the parameter uid to JAVA_BLACOLE.ERZ.

  SOLUTION

Minimum Scan Engine:

9.200

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

Remove malware files dropped/downloaded by JS_BLACOLE.ERZ

Step 3

Close all opened browser windows

Step 4

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