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TROJ_DLOADR.BLE

May 21, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

PWS:Win32/Fareit.gen!I (Microsoft), Trojan.Zbot (Symantec), Generic Downloader.z (McAfee)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

112,128 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Jan 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

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

  • http://www.{BLOCKED}rncyprusweddings.com/340s.exe
  • http://{BLOCKED}uccess.biz/JHp4.exe
  • http://{BLOCKED}202.org/Dia0h.exe
  • http://{BLOCKED}hysicaltherapy.com/WQNM.exe
  • http://{BLOCKED}elbot.com/hwk40m.exe
  • http://{BLOCKED}katerin.com/W0jPbnLy.exe

It saves the files it downloads using the following names:

  • %User Temp%\temp{random number}.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.190.162/forum/viewtopic.php

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.658.03

FIRST VSAPI PATTERN DATE:

15 Jan 2013

VSAPI OPR PATTERN File:

9.659.00

VSAPI OPR PATTERN Date:

16 Jan 2013

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

Search and delete this file

[ Learn More ]
There may be some 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.
  • %User Temp%\{random number}.exe

Step 3

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