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JS_EXPLOIT.BRU
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
Encrypted: Yes
In the wild: Yes

Overview


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

Technical Details


File size: 114,597 bytes
File type: HTML, HTM
Memory resident: No
Initial samples received date: 29 Jul 2011
Payload: Downloads files

Arrival Details

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

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

  • CVE-2006-0003
  • CVE-2010-0188
  • CVE-2010-0840
  • CVE-2010-0886
  • CVE-2010-1885

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://{BLOCKED}6.{BLOCKED}6.240.18/9VBMa76FFnB4VAYu0X5j755pMiSyVrcV?s=mdacot

It saves the files it downloads using the following names:

  • %User Temp%\updates.exe - TROJ_JORIK.BRU

(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.)

Other Details

More information on this vulnerability can be found below:

  • CVE-2006-0003:
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0003
  • http://www.microsoft.com/technet/security/bulletin/ms06-014.mspx
  • CVE-2010-0188:
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0188
  • http://www.adobe.com/support/security/bulletins/apsb10-07.html
  • CVE-2010-0840:
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0840
  • http://www.oracle.com/technetwork/topics/security/javacpumar2010-083341.html
  • CVE-2010-0886:
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0886
  • http://www.oracle.com/technetwork/topics/security/alert-cve-2010-0886-094541.html
  • CVE-2010-1885:
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1885
  • http://www.microsoft.com/technet/security/advisory/2219475.mspx

NOTES:
It may be hosted in the following sites:

  • http://{BLOCKED}v.ru/9VBMa76FFnB4VAYu0X5j755pMiSyVrcV
  • http://{BLOCKED}v.ru/RX1eVH86t3kIj7eD87LSY9NnDZl0kSB6M

Solution


Minimum scan engine: 8.900

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/grayware files dropped/downloaded by JS_EXPLOIT.BRU

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_EXPLOIT.BRU. 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 4

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

NOTES:


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Analysis By: Karl Dominguez

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