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TROJ_DLOADR.AVL

April 22, 2013
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes


  TECHNICAL DETAILS

File Size:

3,251,200 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

04 Aug 2010

Installation

This Trojan adds the following folders:

  • C:\Documents and Settings\All Users\Application Data\Vista

It drops the following copies of itself into the affected system:

  • C:\Documents and Settings\All Users\Application Data\Vista\W7.exe

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
W7.exe Nacional = C:\Documents and Settings\All Users\Application Data\Vista\W7.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Vistaa
=

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}nchonet.com.ar/estilos/mobile3.exe.bak
  • http://www.{BLOCKED}andres.org.ar/new_img/mobile3.exe.bak
  • http://www.{BLOCKED}-webdesign.de/media/mobile3.exe.bak

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.370.05

VSAPI PATTERN Date:

08 Aug 2010

VSAPI PATTERN Date:

8/8/2010 12:00:00 AM

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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • W7.exe Nacional=C:\Documents and Settings\All Users\Application Data\Vista\W7.exe

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software
    • Vistaa

Step 4

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