Analysis by: kathleenno
 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 connects to certain websites to download files detected as TROJ_FAKEAV.SMHB.

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.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 55,296 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 27 Jul 2011
Payload: Downloads files

Arrival Details

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

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Startup%\dxdiag.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

It adds the following processes:

  • svchost.exe

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}.202.121/forum3/load.php?module=grabbers - detected as TROJ_FAKEAV.SMHB
  • http://www.{BLOCKED}-80.com/soft.exe - detected as TROJ_FAKEAV.SMHB

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

Other Details

This Trojan deletes the initially executed copy of itself

NOTES:

It connects to the following URLs to report system infection:

  • http://{BLOCKED}ayom2001.ru/forum3/task.php?bid={parameter}&os={parameter}&uptime={parameter}&rnd={parameter}
  • http://{BLOCKED}natv105.ru/forum3/task.php?bid={parameter}&os={parameter}&uptime={parameter}&rnd={parameter}
  • http://{BLOCKED}d.net/load/task.php?bid={parameter}&os={parameter}&uptime={parameter}&rnd={parameter}
  • http://{BLOCKED}annancc.net/load/task.php?bid={parameter}&os={parameter}&uptime={parameter}&rnd={parameter}

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.314.06
FIRST VSAPI PATTERN DATE: 27 Jul 2011
VSAPI OPR PATTERN File: 8.315.00
VSAPI OPR PATTERN Date: 27 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

Remove malware files dropped/downloaded by TROJ_BREDO.NEW

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_BREDO.NEW. 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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