TROJ_OBFUSCATED_0000030.TOMA


 ALIASES:

TrojanDownloader:Win32/Renos.GN (Microsoft); Downloader-BON (McAfee); SecurityRisk.Dropper (Symantec); Trojan-Downloader.Win32.FraudLoad.wirn (Kaspersky); Trojan-Spy.Win32.Zbot.njy (v) (Sunbelt); Trojan horse FakeAlert.HR (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

72,192 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 May 2013

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:

  • %Program Files%\XPPoliceAntivirus

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{b6b571fb-b71d-449c-ad70-82e966328795}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects

HKEY_CLASSES_ROOT\WinApp.WinSafe.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WinApp.WinSafe.1\CLSID

HKEY_CLASSES_ROOT\WinApp.WinSafe

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WinApp.WinSafe\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WinApp.WinSafe\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}\TypeLib

It adds the following registry entries:

HKEY_CURRENT_USER\Control Panel\don't load
scui.cpl = "No"

HKEY_CURRENT_USER\Control Panel\don't load
wscui.cpl = "No"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{b6b571fb-b71d-449c-ad70-82e966328795}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}\TypeLib
Version = "1.0"

It modifies the following registry entries:

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

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

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

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\XPPoliceAntivirus\setup.dat

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.194.188/setup.dat

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Close all opened browser windows

Step 3

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

Step 4

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
    • System
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • Browser Helper Objects
  • In HKEY_CLASSES_ROOT
    • WinApp.WinSafe.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WinApp.WinSafe.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • WinApp.WinSafe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WinApp.WinSafe
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WinApp.WinSafe
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {b6b571fb-b71d-449c-ad70-82e966328795}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {16406580-14CE-4441-B904-AD56CC8064CA}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{16406580-14CE-4441-B904-AD56CC8064CA}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {967A494A-6AEC-4555-9CAF-FA6EB00ACF91}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}
    • TypeLib

Step 5

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_CURRENT_USER\Control Panel\don't load
    • scui.cpl = "No"
  • In HKEY_CURRENT_USER\Control Panel\don't load
    • wscui.cpl = "No"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{b6b571fb-b71d-449c-ad70-82e966328795}
    • NoExplorer = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{b6b571fb-b71d-449c-ad70-82e966328795}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{967A494A-6AEC-4555-9CAF-FA6EB00ACF91}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{9692BE2F-EB8F-49D9-A11C-C24C1EF734D5}\TypeLib
    • Version = "1.0"

Step 6

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
    • AntiVirusDisableNotify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • UpdatesDisableNotify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • FirewallDisableNotify = "1"

Step 7

Search and delete this file

[ Learn More ]
There may be some 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.
  • %Program Files%\XPPoliceAntivirus\setup.dat

Step 8

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.
  • %Program Files%\XPPoliceAntivirus

Step 9

Scan your computer with your Trend Micro product to delete files detected as TROJ_OBFUSCATED_0000030.TOMA. 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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