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Threat Encyclopedia

JAVA_ARCAL.A

ANALYSIS BY

Rika Joi Gregorio


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:

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW


This Trojan 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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It does not have any information-stealing capability.

TECHNICAL DETAILS

File Size:

21,296 bytes

File Type:

JAR

Initial Samples Received Date:

27 Feb 2013

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan 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 download possibly malicious files:

It 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 then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

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%\{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.)

NOTES:

The downloaded file is detected as TSPY_FAREIT.MEX

This may be hosted on the following sites:

  • http://{BLOCKED}removalonly.org/closest/{random value}.php
  • http://{BLOCKED}owinggopayment.net/closest/{random value}.php
  • http://{BLOCKED}selse.org/closest/{random value}.php

It does not have rootkit capabilities.

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.756.01

FIRST VSAPI PATTERN DATE:

27 Feb 2013

VSAPI OPR PATTERN File:

9.757.00

VSAPI OPR PATTERN Date:

28 Feb 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

Remove malware/grayware files dropped/downloaded by JAVA_ARCAL.A

Step 3

Close all opened browser windows

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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 5

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

Step 6

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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