Analysis by: Kathleen Notario
 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 may be downloaded by other malware/grayware from remote sites.

It saves downloaded files into the said created folder.

  TECHNICAL DETAILS

File Size: Varies
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 13 Nov 2010

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

Installation

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

  • %System Root%\Documents and Settings\All Users\Application Data\Microsoft\qgewcjtlz\q1.{random number}

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

It creates the following folders:

  • %System Root%\Documents and Settings\All Users\Application Data\Microsoft\qgewcjtlz

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

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}er.com.ua/cgi-bin/exhandler4.pl
  • http://{BLOCKED}6.in/{BLOCKED}in/jl/jloader.pl

It saves the files it downloads using the following names:

  • _qbot.cb - non-malicious file
  • _qbot.dll - detected as BKDR_QAKBOT.SME
  • _qbotinj.exe - detected as BKDR_QAKBOT.SME
  • _qbotini.exe - detected as BKDR_QAKBOT.SME
  • msadvapi32.dll - detected as BKDR_QAKBOT.SME
  • nbs - detected as BKDR_QAKBOT.SME

It saves downloaded files into the said created folder.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.617.00
VSAPI PATTERN Date: 13 Nov 2010
VSAPI PATTERN Date: 11/13/2010 12:00:00 AM

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_BAMITAL.AQ

Step 3

Identify and terminate files detected as TROJ_BAMITAL.AQ

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %System Root%\Documents and Settings\All Users\Application Data\Microsoft\qgewcjtlz

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BAMITAL.AQ. 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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