TROJ_DELF.MTJ

October 31, 2012

ALIASES:

VirTool:WinNT/Livuto.gen!sys (Microsoft); [00033600.EXE]:Downloader.gen.a, [000063e8.EXE\2.nsis]:AdClicker-ER.dll, [000063e8.EXE\3.nsis]:AdCli (McAfee); Suspicious.SillyFDC (Symantec); Trojan-Downloader.Win32.Delf.diw (Kaspersky); BehavesLike.Win32.Malware.bsf (vs) (Sunbelt)

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 deletes itself after execution.

TECHNICAL DETAILS

File Size:

239,616 bytes

File Type:

EXE

Memory Resident:

Initial Samples Received Date:

31 Oct 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.

Installation

This Trojan creates the following folders:

%System%\89840
%System Root%\DOCUME~1
%System Root%\DOCUME~1\Wilbert
%User Profile%\LOCALS~1
%User Temp%\HostEx
%User Temp%\HostEx\C
%Program Files%\Wosou

(Note: %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

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\{E601995E-E400-41CA-804B-CD6373A7EEF2}

Other System Modifications

This Trojan deletes the following files:

%User Temp%\nsf1.tmp
%User Temp%\HostEx\20811_.exe
%System Root%\_DELET~1.BAT
%User Temp%\nsu2.tmp

(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 Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Wosou

HKEY_CLASSES_ROOT\Wosou.WosouBHO.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wosou.WosouBHO.1\CLSID

HKEY_CLASSES_ROOT\Wosou.WosouBHO

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wosou.WosouBHO\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wosou.WosouBHO\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\TypeLib

HKEY_CLASSES_ROOT\Wazap.WazapConfig.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wazap.WazapConfig.1\CLSID

HKEY_CLASSES_ROOT\Wazap.WazapConfig

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wazap.WazapConfig\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wazap.WazapConfig\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Extensions\{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}\TypeLib

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wosou
PartnerIdentifier = "20811_.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{E601995E-E400-41CA-804B-CD6373A7EEF2}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings\
5.0\User Agent\Post Platform
WBP/20071030cn = "Wosou Browser Plug-in"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Extensions\{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Extensions\{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
ClsidExtension = "{E98C2E86-BEE0-4023-953C-174C21F76486}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}\TypeLib
Version = "1.0"

Dropping Routine

This Trojan drops the following files:

%System%\89840\svchost.exe
%System%\20811.exe
%System Root%\_deleteme.bat
%User Temp%\HostEx\C\Autolive.dll
%User Temp%\HostEx\C\Autolive.sys
%User Temp%\HostEx\C\autolive.ini
%User Temp%\HostEx\Setup.exe
%User Temp%\HostEx\20714.exe
%System%\svr_log.txt
%User Temp%\nsu3.tmp
%Program Files%\Wosou\ie_wosou.dll
%Program Files%\Wosou\configuration.xml
%Program Files%\Wosou\config.ini
%System%\drivers\tuxzvv58.sys
%System%\tuxzvv58.ini
%System%\tuxzvv58.dll

Other Details

This Trojan connects to the following possibly malicious URL:

http://r.{BLOCKED}b.com.cn/comm/reghost.php?{random characters}
http://www.{BLOCKED}t.cn/UI/Report.aspx?{random characters}

It deletes itself after execution.

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

9.300

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_LOCAL_MACHINE\Software
- Wosou

In HKEY_CLASSES_ROOT
- Wosou.WosouBHO.1

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wosou.WosouBHO.1
- CLSID

In HKEY_CLASSES_ROOT
- Wosou.WosouBHO

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wosou.WosouBHO
- CLSID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wosou.WosouBHO
- CurVer

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {E601995E-E400-41CA-804B-CD6373A7EEF2}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- ProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- VersionIndependentProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- Programmable

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- InprocServer32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- TypeLib

In HKEY_CLASSES_ROOT
- Wazap.WazapConfig.1

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wazap.WazapConfig.1
- CLSID

In HKEY_CLASSES_ROOT
- Wazap.WazapConfig

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wazap.WazapConfig
- CLSID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wazap.WazapConfig
- CurVer

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {E98C2E86-BEE0-4023-953C-174C21F76486}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}
- ProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}
- VersionIndependentProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}
- Programmable

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}
- InprocServer32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}
- TypeLib

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions
- {0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {3FBF4869-19AC-487A-8999-BC6BB6391E0D}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}
- 1.0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0
- FLAGS

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0
- 0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0\0
- win32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3FBF4869-19AC-487A-8999-BC6BB6391E0D}\1.0
- HELPDIR

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {EAABCF5F-0FAF-41C3-B482-2DA133C5D083}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}
- TypeLib

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {C386465B-9F09-420B-911B-29F8BB8A302D}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}
- 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_LOCAL_MACHINE>Software
Still in the left panel, locate and delete the key:
Wosou
In the left panel, double-click the following:
HKEY_CLASSES_ROOT
Still in the left panel, locate and delete the key:
Wosou.WosouBHO.1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Wosou.WosouBHO.1
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
Wosou.WosouBHO
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Wosou.WosouBHO
Still in the left panel, locate and delete the key:
CLSID
Again 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:
{E601995E-E400-41CA-804B-CD6373A7EEF2}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{E601995E-E400-41CA-804B-CD6373A7EEF2}
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
Again Still in the left panel, locate and delete the key:
TypeLib
Again Still in the left panel, locate and delete the key:
Wazap.WazapConfig.1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Wazap.WazapConfig.1
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
Wazap.WazapConfig
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Wazap.WazapConfig
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
CurVer
Again Still in the left panel, locate and delete the key:
{E98C2E86-BEE0-4023-953C-174C21F76486}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{E98C2E86-BEE0-4023-953C-174C21F76486}
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
Again Still in the left panel, locate and delete the key:
TypeLib
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Internet Explorer>Extensions
Still in the left panel, locate and delete the key:
{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib
Still in the left panel, locate and delete the key:
{3FBF4869-19AC-487A-8999-BC6BB6391E0D}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{3FBF4869-19AC-487A-8999-BC6BB6391E0D}
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>{3FBF4869-19AC-487A-8999-BC6BB6391E0D}>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>{3FBF4869-19AC-487A-8999-BC6BB6391E0D}>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:
{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}
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
Again Still in the left panel, locate and delete the key:
{C386465B-9F09-420B-911B-29F8BB8A302D}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{C386465B-9F09-420B-911B-29F8BB8A302D}
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 ]

In HKEY_LOCAL_MACHINE\SOFTWARE\Wosou
- PartnerIdentifier = "20811_.exe"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E601995E-E400-41CA-804B-CD6373A7EEF2}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{E601995E-E400-41CA-804B-CD6373A7EEF2}
- NoExplorer = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Post Platform
- WBP/20071030cn = "Wosou Browser Plug-in"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{E98C2E86-BEE0-4023-953C-174C21F76486}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions\{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
- CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions\{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
- ClsidExtension = "{E98C2E86-BEE0-4023-953C-174C21F76486}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}\TypeLib
- Version = "1.0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{C386465B-9F09-420B-911B-29F8BB8A302D}\TypeLib
- Version = "1.0"

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>Wosou
In the right panel, locate and delete the entry:
PartnerIdentifier = "20811_.exe"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{E601995E-E400-41CA-804B-CD6373A7EEF2}>InprocServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Browser Helper Objects>{E601995E-E400-41CA-804B-CD6373A7EEF2}
In the right panel, locate and delete the entry:
NoExplorer = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Internet Settings>5.0>User Agent>Post Platform
In the right panel, locate and delete the entry:
WBP/20071030cn = "Wosou Browser Plug-in"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{E98C2E86-BEE0-4023-953C-174C21F76486}>InprocServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Internet Explorer>Extensions>{0F7195C2-6713-4d93-A1BC-DA5FA33F0A65}
In the right panel, locate and delete the entry:
CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"
Again In the right panel, locate and delete the entry:
ClsidExtension = "{E98C2E86-BEE0-4023-953C-174C21F76486}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{EAABCF5F-0FAF-41C3-B482-2DA133C5D083}>TypeLib
In the right panel, locate and delete the entry:
Version = "1.0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{C386465B-9F09-420B-911B-29F8BB8A302D}>TypeLib
In the right panel, locate and delete the entry:
Version = "1.0"
Close Registry Editor.

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.

%System%\89840\svchost.exe
%System%\20811.exe
%System Root%\_deleteme.bat
%User Temp%\HostEx\C\Autolive.dll
%User Temp%\HostEx\C\Autolive.sys
%User Temp%\HostEx\C\autolive.ini
%User Temp%\HostEx\Setup.exe
%User Temp%\HostEx\20714.exe
%System%\svr_log.txt
%User Temp%\nsu3.tmp
%Program Files%\Wosou\ie_wosou.dll
%Program Files%\Wosou\configuration.xml
%Program Files%\Wosou\config.ini
%System%\drivers\tuxzvv58.sys
%System%\tuxzvv58.ini
%System%\tuxzvv58.dll

Step 6

Search and delete these folders

[ 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.

%System%\89840
%System Root%\DOCUME~1
%System Root%\DOCUME~1\Wilbert
%User Profile%\LOCALS~1
%User Temp%\HostEx
%User Temp%\HostEx\C
%Program Files%\Wosou

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DELF.MTJ. 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.

%User Temp%\nsf1.tmp
%User Temp%\HostEx\20811_.exe
%System Root%\_DELET~1.BAT
%User Temp%\nsu2.tmp

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TROJ_DELF.MTJ

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