Analysis by: Nikko Tamana
ALIASES:

Exploit-CVE2012-5076 (McAfee), a variant of Java/Exploit.CVE-2012-5076.A (NOD32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan may arrive bundled with malware packages as a malware component. It may be hosted on a website and run when a user accesses the said website.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 10,387 bytes
File Type: Java Class
Initial Samples Received Date: 16 Nov 2012
Payload: Downloads files

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

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

Download Routine

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

It saves the files it downloads using the following names:

  • %User Temp%\{file name}.exe

(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

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

This Trojan downloads the file from the URL specified in the parameter valprime.

It executes the downloaded file using the following commands:

regsvr32 -s "%User Temp%\{file name}.exe"
%User Temp%\{file name}.exe

The file name may be any of the following:

  • a43vtzgbdgv
  • ab43yctewatv
  • atv4tvq34
  • av4a43by4ayb
  • awt43abr
  • bawt34tv
  • berstrestvers
  • bg34dfbewgba4
  • tab4vrtve
  • wgsdgsdgdsgsd

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.530.03
FIRST VSAPI PATTERN DATE: 16 Nov 2012
VSAPI OPR PATTERN File: 9.531.00
VSAPI OPR PATTERN Date: 17 Nov 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 JAVA_EXPLOYT.COL. 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 this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

  • http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html


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