TSPY_QBOT.W

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Backdoor:Win32/Qakbot.gen!A (Microsoft); W32.Qakbot (Symantec); W32/Pinkslipbot.gen.w (McAfee); Trojan-PSW.Win32.Qbot.wm (Kaspersky); Backdoor.Win32.Qakbot.cd (Sunbelt)

 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes then deletes itself afterward.

It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size:

97,792 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

18 Nov 2010

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %System Root%\Documents and Settings\All Users\Application Data\Microsoft\eeozazsq\{random file name}

(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\eeozazsq

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

It executes then deletes itself afterward.

Download Routine

This Trojan connects to the following malicious URLs:

  • http://{BLOCKED}ver.com.ua/cgi-bin/exhandler4.pl

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.630.02

FIRST VSAPI PATTERN DATE:

18 Nov 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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete these folders

[ 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\eeozazsq

Step 4

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