JAVA_DLOADER.AJ

October 09, 2012
 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 is a .class component of a malicious Java archive file (.JAR), which attempts to download and execute possibly malicious files from a certain website.

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.

  TECHNICAL DETAILS

File Size:

1,813 bytes

File Type:

Java Class

Initial Samples Received Date:

06 Feb 2012

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.

NOTES:

This is a .class component of a malicious Java archive file (.JAR), which attempts to download and execute possibly malicious files from a certain website.

The download link depends on where the malicious Java Class is hosted. The downloaded file is usually saved as %User Temp%\add.exe.

As a a result, routines of the downloaded files may also be exhibited in the affected system.

(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.)

The .JAR package consists of the following components:

  • MyApplet.class
  • MyLoader.class
  • MyWorker.class

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.758.03

FIRST VSAPI PATTERN DATE:

06 Feb 2012

VSAPI OPR PATTERN File:

8.759.00

VSAPI OPR PATTERN Date:

07 Feb 2012

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

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