PE_TUFIK.AT

This file infector 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: 155,648 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 07 Nov 2011

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This file infector 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\{CE7C3CF0-4B15-11D1-ABED-709549C10000}

Other System Modifications

This file infector adds the following registry keys:

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
IEHlprObj.IEHlprObj.1\CLSID

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
IEHlprObj.IEHlprObj\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\InprocServer32

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}\TypeLib

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}\TypeLib
Version = "1.0"

Dropping Routine

This file infector drops the following files:

%User Temp%\1.tmp_bak.exe
%System%\iexplroer.exe

(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.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This file infector connects to the following possibly malicious URL:

http://ieopen.{BLOCKED}s.com/down/upbho.exe

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

Close all opened browser windows

Step 3

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_CLASSES_ROOT
- IEHlprObj.IEHlprObj.1

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1
- CLSID

In HKEY_CLASSES_ROOT
- IEHlprObj.IEHlprObj

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\IEHlprObj.IEHlprObj
- CurVer

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {CE7C3CF0-4B15-11D1-ABED-709549C10000}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}
- ProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}
- VersionIndependentProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}
- Programmable

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}
- InprocServer32

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

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {CE7C3CE2-4B15-11D1-ABED-709549C10000}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}
- 1.0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0
- FLAGS

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0
- 0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0\0
- win32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{CE7C3CE2-4B15-11D1-ABED-709549C10000}\1.0
- HELPDIR

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {CE7C3CEF-4B15-11D1-ABED-709549C10000}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}
- TypeLib

To delete the registry key this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CLASSES_ROOT
Still in the left panel, locate and delete the key:
IEHlprObj.IEHlprObj.1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>IEHlprObj.IEHlprObj.1
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
IEHlprObj.IEHlprObj
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>IEHlprObj.IEHlprObj
Still in the left panel, locate and delete the key:
CurVer
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID
Still in the left panel, locate and delete the key:
{CE7C3CF0-4B15-11D1-ABED-709549C10000}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{CE7C3CF0-4B15-11D1-ABED-709549C10000}
Still in the left panel, locate and delete the key:
ProgID
Again Still in the left panel, locate and delete the key:
VersionIndependentProgID
Again Still in the left panel, locate and delete the key:
Programmable
Again Still in the left panel, locate and delete the key:
InprocServer32
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer
Still in the left panel, locate and delete the key:
Browser Helper Objects
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib
Still in the left panel, locate and delete the key:
{CE7C3CE2-4B15-11D1-ABED-709549C10000}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{CE7C3CE2-4B15-11D1-ABED-709549C10000}
Still in the left panel, locate and delete the key:
1.0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{CE7C3CE2-4B15-11D1-ABED-709549C10000}>1.0
Still in the left panel, locate and delete the key:
FLAGS
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{CE7C3CE2-4B15-11D1-ABED-709549C10000}>1.0>0
Still in the left panel, locate and delete the key:
win32
Again Still in the left panel, locate and delete the key:
HELPDIR
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface
Still in the left panel, locate and delete the key:
{CE7C3CEF-4B15-11D1-ABED-709549C10000}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{CE7C3CEF-4B15-11D1-ABED-709549C10000}
Still in the left panel, locate and delete the key:
ProxyStubClsid
Again Still in the left panel, locate and delete the key:
ProxyStubClsid32
Again Still in the left panel, locate and delete the key:
TypeLib
Close Registry Editor.

Step 4

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\Classes\CLSID\{CE7C3CF0-4B15-11D1-ABED-709549C10000}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{CE7C3CEF-4B15-11D1-ABED-709549C10000}\TypeLib
- Version = "1.0"

Step 5

Search and delete these files

[ 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%\1.tmp_bak.exe
%System%\iexplroer.exe

Step 6

Scan your computer with your Trend Micro product to clean files detected as PE_TUFIK.AT. 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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