JAVA_EXPLOYT.TRE

March 24, 2014
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Exploit:Java/CVE-2012-0507 (Microsoft)

 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:

Dropped by other malware, 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 takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

19,270 bytes

File Type:

Java Class

Initial Samples Received Date:

27 Jun 2013

Payload:

Downloads files, Executes 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 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 Profile%\{random hex numbers}.exe
  • %User Profile%\{random hex numbers}.dll

(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

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan executes the downloaded file using the following commands:

  • regsvr32 -s %User Profile%\{random hex numbers}.dll
  • %User Profile%\{random hex numbers}.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.)

NOTES:

It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.344.04

FIRST VSAPI PATTERN DATE:

17 Oct 2013

VSAPI OPR PATTERN File:

10.345.00

VSAPI OPR PATTERN Date:

17 Oct 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 Profile%\{random hex numbers}.exe
  • %User Profile%\{random hex numbers}.dll

Step 4

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