TROJ_BANLOAD.KMZ
TrojanDownloader:Win32/Banload.ASU (Microsoft); Win32/TrojanDownloader.Banload.SQA (ESET-NOD32)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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
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.
Installation
This Trojan creates the following folders:
- %SystemRoot%\WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Security = "%SystemRoot%\WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed\taskhosts.exe"
Other System Modifications
This Trojan deletes the following folders:
- %SystemRoot%\Arquivos de Programas (x64)\AVG
- %SystemRoot%\Arquivos de Programas (x64)\AVG Secure Search
- %SystemRoot%\Arquivos de Programas (x86)\AVG
- %SystemRoot%\Arquivos de Programas (x86)\AVG Secure Search
- %SystemRoot%\Arquivos de Programas\AVG
- %SystemRoot%\Arquivos de Programas\AVG Secure Search
- %SystemRoot%\Arquivos de programas (x64)\AVAST Software
- %SystemRoot%\Arquivos de programas (x64)\AVG
- %SystemRoot%\Arquivos de programas (x64)\AVG Secure Search
- %SystemRoot%\Arquivos de programas (x86)\AVAST Software
- %SystemRoot%\Arquivos de programas (x86)\AVG
- %SystemRoot%\Arquivos de programas (x86)\AVG Secure Search
- %SystemRoot%\Arquivos de programas\AVAST Software
- %SystemRoot%\Arquivos de programas\AVG Secure Search
- %SystemRoot%\Arquivos de programas\Google\Google Toolbar
- %SystemRoot%\Documents and Settings\All Users\Dados de aplicativos\AVAST Software
- %SystemRoot%\Documents and Settings\All Users\Dados de aplicativos\AVG2013
- %SystemRoot%\Program Files\Google\Google Toolbar
- %SystemRoot%\ProgramData\AVG Secure Search
- %SystemRoot%\ProgramData\AVG2013
It adds the following registry keys:
HKEY_CURRENT_USER\full
HKEY_CURRENT_USER\Software\Microsoft\
IEAK
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UACDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Start = "4"
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- http://www.{BLOCKED}rquerquer.net/mdl_dwn/taskhosts.my
It saves the files it downloads using the following names:
- %SystemRoot%\WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed\taskhosts.my
NOTES:
After completing the download routine, this Trojan displays the following message and proceeds to restart the computer:
It connects to the non-malicious site http://windows.microsoft.com/pt-br/windows/support#top-solutions=windows-7.
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- HKEY_CURRENT_USER\full
- HKEY_CURRENT_USER\Software\Microsoft\IEAK
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Security = "%SystemRoot%\WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed\taskhosts.exe"
- Windows Security = "%SystemRoot%\WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed\taskhosts.exe"
Step 5
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
Step 6
Search and delete these folders
- %SystemRoot%WinSoft\WRInfo\Contents\PerfLogs\Documentation\Sample\Closed
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BANLOAD.KMZ. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
Did this description help? Tell us how we did.