JAVA_BLACOLE.JC

December 10, 2012
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Exploit:Java/CVE-2012-0507.BIG (Microsoft), Troj/JavaDL-SU (Sophos), Java/Jogek.MO (Antivir)

 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

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.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Java Class

Initial Samples Received Date:

06 Dec 2012

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 saves the files it downloads using the following names:

  • %User Profile%\awt43abr.exe
  • %User Profile%\berstrestvers.exe
  • %User Profile%\bawt34tv.exe
  • %User Profile%\tab4vrtve.exe
  • %User Profile%\wgsdgsdgdsgsd.exe
  • %User Profile%\ab43yctewatv.exe
  • %User Profile%\a43vtzgbdgv.exe
  • %User Profile%\atv4tvq34.exe
  • %User Profile%\bg34dfbewgba4.exe
  • %User Profile%\av4a43by4ayb.exe

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

It downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the following parameter(s) passed on to it by its components:

  • val
  • prime

Other Details

This Trojan executes the downloaded file using the following commands:

  • regsvr32 -s %User Profile%\{file name}.exe
  • %User Profile%\{file name}.exe

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

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.576.02

FIRST VSAPI PATTERN DATE:

06 Dec 2012

VSAPI OPR PATTERN File:

9.577.00

VSAPI OPR PATTERN Date:

07 Dec 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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete these files

[ Learn More ]
There may be some component 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 Profile%\awt43abr.exe
  • %User Profile%\berstrestvers.exe
  • %User Profile%\bawt34tv.exe
  • %User Profile%\tab4vrtve.exe
  • %User Profile%\wgsdgsdgdsgsd.exe
  • %User Profile%\ab43yctewatv.exe
  • %User Profile%\a43vtzgbdgv.exe
  • %User Profile%\atv4tvq34.exe
  • %User Profile%\bg34dfbewgba4.exe
  • %User Profile%\av4a43by4ayb.exe

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as JAVA_BLACOLE.JC. 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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