TROJ_BANLOAD.GHO

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.

File Size: 1,552,896 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 16 Jul 2012

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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\MRT

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Attachments

HKEY_CLASSES_ROOT\Applications\Beholder.exe

HKEY_CLASSES_ROOT\Applications\Nicrosoft.exe

HKEY_CLASSES_ROOT\Applications\NatGat_.exe

HKEY_CURRENT_USER\Software\Beholder

HKEY_CURRENT_USER\Software\MSDOS

HKEY_CURRENT_USER\Software\Classes\
Applications\regss.exe

HKEY_CURRENT_USER\Software\Classes\
Applications\NatGat_.exe

HKEY_CURRENT_USER\Software\Classes\
Applications\Nicrosoft.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UACDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AutoUpdateDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
InternetSettingsDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
UACDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
AntiVirusDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
FirewallDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
AntiVirusOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
FirewallOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
UpdatesDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
UpdatesOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender
DisableAntiSpyware = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\MRT
DontReportInfectionInformation = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = ".exe;.bat;.com;.cmd;"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Attachments
SaveZoneInformation = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
RunInvalidSignatures = "1"

HKEY_CURRENT_USER\Applications\regss.exe
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

HKEY_CURRENT_USER\Applications\NatGat_.exe
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

HKEY_CURRENT_USER\Applications\Nicrosoft.exe
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers
%System%\hookDll.dll = "NoAsInvoker"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers
%Application Data%\inicio.exe = "NoAsInvoker"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers
%System%\MSDOS.pif = "NoAsInvoker"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Layers
%Application Data%\regss.exe = "NoAsInvoker"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirstRunDisabled = "1"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = "1"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
CheckExeSignatures = "no"

(Note: The default value data of the said registry entry is yes.)

Dropping Routine

This Trojan drops the following files:

%User Temp%\logs_avisos.log

(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.)

This report is generated via an automated analysis system.

Minimum Scan Engine: 9.200

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

Delete this registry key

[ Learn More ]

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\SOFTWARE\Microsoft\Security Center
- Svc

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft
- Windows Defender

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft
- MRT

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- Associations

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- Attachments

In HKEY_CLASSES_ROOT\Applications
- Beholder.exe

In HKEY_CLASSES_ROOT\Applications
- Nicrosoft.exe

In HKEY_CLASSES_ROOT\Applications
- NatGat_.exe

In HKEY_CURRENT_USER\Software
- Beholder

In HKEY_CURRENT_USER\Software
- MSDOS

In HKEY_CURRENT_USER\Software\Classes\Applications
- regss.exe

In HKEY_CURRENT_USER\Software\Classes\Applications
- NatGat_.exe

In HKEY_CURRENT_USER\Software\Classes\Applications
- Nicrosoft.exe

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
- Layers

Step 3

Delete this registry value

[ Learn More ]

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\SOFTWARE\Microsoft\Security Center
- UACDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AutoUpdateDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- InternetSettingsDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- UACDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- AntiVirusDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- FirewallDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- AntiVirusOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- FirewallOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- UpdatesDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- UpdatesOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
- DisableAntiSpyware = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\MRT
- DontReportInfectionInformation = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
- LowRiskFileTypes = ".exe;.bat;.com;.cmd;"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
- SaveZoneInformation = "1"

In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
- RunInvalidSignatures = "1"

In HKEY_CURRENT_USER\Applications\regss.exe
- TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

In HKEY_CURRENT_USER\Applications\NatGat_.exe
- TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

In HKEY_CURRENT_USER\Applications\Nicrosoft.exe
- TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
- %System%\hookDll.dll = "NoAsInvoker"

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
- %Application Data%\inicio.exe = "NoAsInvoker"

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
- %System%\MSDOS.pif = "NoAsInvoker"

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
- %Application Data%\regss.exe = "NoAsInvoker"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center
In the right panel, locate and delete the entry:
UACDisableNotify = "1"
Again In the right panel, locate and delete the entry:
AutoUpdateDisableNotify = "1"
Again In the right panel, locate and delete the entry:
InternetSettingsDisableNotify = "1"
Again In the right panel, locate and delete the entry:
UpdatesOverride = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center>Svc
In the right panel, locate and delete the entry:
UACDisableNotify = "1"
Again In the right panel, locate and delete the entry:
AntiVirusDisableNotify = "1"
Again In the right panel, locate and delete the entry:
FirewallDisableNotify = "1"
Again In the right panel, locate and delete the entry:
AntiVirusOverride = "1"
Again In the right panel, locate and delete the entry:
FirewallOverride = "1"
Again In the right panel, locate and delete the entry:
UpdatesDisableNotify = "1"
Again In the right panel, locate and delete the entry:
UpdatesOverride = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender
In the right panel, locate and delete the entry:
DisableAntiSpyware = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>MRT
In the right panel, locate and delete the entry:
DontReportInfectionInformation = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>system
In the right panel, locate and delete the entry:
EnableLUA = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies>Associations
In the right panel, locate and delete the entry:
LowRiskFileTypes = ".exe;.bat;.com;.cmd;"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies>Attachments
In the right panel, locate and delete the entry:
SaveZoneInformation = "1"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Internet Explorer>Download
In the right panel, locate and delete the entry:
RunInvalidSignatures = "1"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Applications>regss.exe
In the right panel, locate and delete the entry:
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Applications>NatGat_.exe
In the right panel, locate and delete the entry:
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Applications>Nicrosoft.exe
In the right panel, locate and delete the entry:
TaskbarGroupIcon = "%System Root%\Arquivos de programs\AVG\AVG10\avguires.dll,-128"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows NT>CurrentVersion>AppCompatFlags>Layers
In the right panel, locate and delete the entry:
%System%\hookDll.dll = "NoAsInvoker"
Again In the right panel, locate and delete the entry:
%Application Data%\inicio.exe = "NoAsInvoker"
Again In the right panel, locate and delete the entry:
%System%\MSDOS.pif = "NoAsInvoker"
Again In the right panel, locate and delete the entry:
%Application Data%\regss.exe = "NoAsInvoker"
Close Registry Editor.

Step 4

Restore this modified registry value

[ Learn More ]

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\SOFTWARE\Microsoft\Security Center
- From: FirstRunDisabled = "1"
  To: FirstRunDisabled = ""1""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallOverride = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = "1"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "2"
  To: Hidden = ""2""

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: HideFileExt = "1"
  To: HideFileExt = ""1""

In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
- From: CheckExeSignatures = "no"
  To: CheckExeSignatures = ""yes""

Step 5

Search and delete this file

[ Learn More ]

There may be some component 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%\logs_avisos.log

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.GHO. 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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