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Threat Encyclopedia

TROJ_DLDER.AU

ANALYSIS BY

Michael Cabel


PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW


This Trojan uses social engineering methods to lure users into performing certain actions that may, directly or indirectly, cause malicious routines to be performed. Specifically, it makes use of spammed email messages that contains text alleging the death of a certain famous celebrity.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

It accesses websites to download a file detected as TROJ_BREDOLAB.XY.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

TECHNICAL DETAILS

File Size:

20,480 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

10 Mar 2010

Payload:

Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}.74.161/mrmun_sgjlgdsjrthrtwg.exe - inaccessible
  • http://{BLOCKED}.{BLOCKED}.112.3/outlook.exe

It saves the files it downloads using the following names:

  • %Temp%\_ex-{Random}.exe

(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

Trend Micro detects the dowloaded file as:

  • TROJ_BREDOLAB.XY

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

VSAPI OPR PATTERN File:

7.403.00

VSAPI OPR PATTERN Date:

22 Aug 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

Remove malware files dropped/downloaded by TROJ_DLDER.AU

Step 3

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