TROJ_BANLOAD.VCA

 Analysis by: Jeffrey Bernardino

 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 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 an email purportedly containing a footage of a certain Brazilian actor beating his ex-wife.

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

This Trojan arrives as a file that can be downloaded from a link contained in an email message.

This Trojan may be downloaded unknowingly by a user when visiting malicious website(s).

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

  TECHNICAL DETAILS

File Size:

230,400 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

26 Aug 2010

Payload:

Downloads files

Arrival Details

This Trojan may be downloaded unknowingly by a user when visiting the following malicious website(s):

  • http://{BLOCKED}as.dnsdojo.org/images/lincoln_university/notice/videos/urgentes/ ultimas/23/08/2010/noticias_dado_dalabella_viviane_sarahyba.php?0.96497

Dropping Routine

This Trojan drops the following files:

  • %System Root%\networkconfing.bat - executes %System%\cttfmon.exe
  • %System Root%\nsconf.bat - executes %System Root%\wakeLuan3.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.150.47/images/top1.gif
  • http://{BLOCKED}.{BLOCKED}.150.47/images/top2.gif

It saves the files it downloads using the following names:

  • %System%\cttfmon.exe – detected as TROJ_DLOADE.KY
  • %System Root%\wakeLuan3.exe – detected as TROJ_SWISYN.AJ

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

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:

7.419.00

VSAPI OPR PATTERN Date:

28 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_BANLOAD.VCA

Step 3

Search and delete these files

[ 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%\networkconfing.bat
  • %System Root%\nsconf.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.VCA. 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.


Did this description help? Tell us how we did.