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TROJ_FAKEAVDL.D

October 08, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, 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 arrives as attachment to mass-mailed email messages. However, as of this writing, the said sites are inaccessible.

It executes then deletes itself afterward.

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

  TECHNICAL DETAILS

File Size:

15,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Sep 2010

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

However, as of this writing, the said sites are inaccessible.

Installation

This Trojan executes then deletes itself afterward.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Printers\Connections
affid = "396"

HKEY_CURRENT_USER\Printers\Connections
subid = "landing"

Dropping Routine

This Trojan drops the following files:

  • %System Root%\Documents and Settings\All Users\Favorites\_favdata.dat - non-malicious file

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}ullups.com/a/ad
  • http://www.{BLOCKED}ashamed.org/a/ad

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

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.488.10

FIRST VSAPI PATTERN DATE:

25 Sep 2010

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

Search and delete this file

[ Learn More ]
There may be some component 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. %System Root%\Documents and Settings\All Users\Favorites\_favdata.dat

Step 3

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\Printers\Connections
    • affid=396
  • In HKEY_CURRENT_USER\Printers\Connections
    • subid=landing

Step 4

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