Analysis by: Rika Joi Gregorio
 Modified by: Nikko Tamana
ALIASES:

Exploit:Java/CVE-2012-1723(Microsoft), LooksLike.Java.CVE-2012-1723.a (v)(Sunbelt)

 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:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages. 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 does not drop any other file.

  TECHNICAL DETAILS

File Size: 34,651 bytes
File Type: JAR
Initial Samples Received Date: 22 Apr 2013

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

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.

Dropping Routine

This Trojan does not drop any other file.

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}.{file extension}

(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.)

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:

  • date
  • guid

Other Details

This Trojan executes the downloaded file using the following commands:

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

(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:

{file name} may be any of the following:

  • acrobat
  • acrobatreader
  • alg
  • chrome
  • conhost
  • csrss
  • ctfmon
  • firefox
  • flashplayer
  • googleupdate
  • icq
  • iexplore
  • java
  • jqs
  • jucheck
  • msconfig
  • mstsc
  • notepad
  • opera
  • rundll32
  • skype
  • spoolsv
  • teamviewer
  • vlcplayer
  • windowsupdate
  • winlogon

{file extension} may be any of the following:

  • exe
  • dll

It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.876.04
FIRST VSAPI PATTERN DATE: 24 Apr 2013
VSAPI OPR PATTERN File: 9.877.00
VSAPI OPR PATTERN Date: 25 Apr 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%\{file name}.{file extension}

Step 4

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


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