Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan checks if the operating system used on the affected system is Windows. If so, it downloads a possibly malicious file from where it is hosted and saves the said file as %User Temp%\{random file rame}.exe. It then executes the downloaded file. As a result, routines of the downloaded file are then exhibited on the affected system.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: 16,405 bytes
File Type: Java Class
Initial Samples Received Date: 19 Jul 2011

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be hosted on a website and run when a user accesses the said website.

NOTES:
It checks if the operating system used on the affected system is Windows. If so, it downloads a possibly malicious file from where it is hosted and saves the said file as %User Temp%\{random file rame}.exe. It then executes the downloaded file. As a result, routines of the downloaded file are then exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.296.14
FIRST VSAPI PATTERN DATE: 19 Jul 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

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