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JAVA_EXPLOYT.LH

January 10, 2014
 Analysis by: Rika Joi Gregorio
 ALIASES:

Exploit:Java/CVE-2012-1723(Microsoft), JV/Exploit-Blacole.t(McAfee), Exploit.Java.CVE-2012(Ikarus), Java/Exploit.CVE-2012-1723.CU trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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 does not have any propagation routine.

It does not have any backdoor routine.

It downloads a file from a certain URL then renames it before storing it in the affected system. It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files.

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

  TECHNICAL DETAILS

File Size:

16,231 bytes

File Type:

JAR

Initial Samples Received Date:

23 Dec 2013

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.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan downloads files from the following URLs then renames them before storage in the affected system:

  • http://{URL}?asd=12gqw

It takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

It saves the files it downloads using the following names:

  • %User Temp%\awt43abr.exe
  • %User Temp%\berstrestvers.exe
  • %User Temp%\bawt34tv.exe
  • %User Temp%\tab4vrtve.exe
  • %User Temp%\wgsdgsdgdsgsd.exe
  • %User Temp%\ab43yctewatv.exe
  • %User Temp%\a43vtzgbdgv.exe
  • %User Temp%\atv4tvq34.exe
  • %User Temp%\bg34dfbewgba4.exe
  • %User Temp%\av4a43by4ayb.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

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

It executes the downloaded file using the following commands:

  • regsvr32 -s %User Temp%\{file name}.exe
  • %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

NOTES:

The term {URL} is passed by the loaded resource of njinjinjib.class.

It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.498.04

FIRST VSAPI PATTERN DATE:

26 Dec 2013

VSAPI OPR PATTERN File:

10.499.00

VSAPI OPR PATTERN Date:

27 Dec 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Search and delete these files

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

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPLOYT.LH. 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 5

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.


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