TROJ_BANLOAD.YZZ

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: 2,886,144 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 05 Sep 2014

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

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_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"

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:

%Application Data%\winzip.zip
%Application Data%\libmysql.dll
%Application Data%\xqusy67ewqq9.exe
%Application Data%\zyndsl2189.exe

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

Other Details

This Trojan connects to the following possibly malicious URL:

http://stocco.{BLOCKED}m.br/web/stoqueiros/pdf/wqsatwq5.zip
{BLOCKED}9.245.181

This report is generated via an automated analysis system.

Minimum Scan Engine: 9.700

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

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

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_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"

To delete the registry value this malware/grayware created:

Open Registry Editor.
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 (R2) users, right-click on the lower-left corner of the screen, click Run, type regedit in the text box provided, and 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_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"
Close Registry Editor.

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out 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 these components

[ Learn More ]

There may be some components 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.

%Application Data%\winzip.zip
%Application Data%\libmysql.dll
%Application Data%\xqusy67ewqq9.exe
%Application Data%\zyndsl2189.exe

Step 6

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