TROJ_DROPPER.IRE

October 03, 2012

ALIASES:

Trojan:Win32/Procesemes.A (Microsoft); Generic Dropper.ew (McAfee); Packed.Generic.222 (Symantec); Packed.Win32.Krap.ap (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.2393748 (FSecure)

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.

TECHNICAL DETAILS

File Size: 326,656 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 03 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.

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\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{D91A85D4-5542-4488-939D-1CD3982F8068}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\boitsqu.DLL

HKEY_CLASSES_ROOT\xyudamzspdorzbp.Mxjkmfrlfvmoq.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Mxjkmfrlfvmoq.1\CLSID

HKEY_CLASSES_ROOT\xyudamzspdorzbp.Mxjkmfrlfvmoq

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Mxjkmfrlfvmoq\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Mxjkmfrlfvmoq\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\TypeLib

HKEY_CLASSES_ROOT\xyudamzspdorzbp.Pboitstjxbckd.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Pboitstjxbckd.1\CLSID

HKEY_CLASSES_ROOT\xyudamzspdorzbp.Pboitstjxbckd

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Pboitstjxbckd\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
xyudamzspdorzbp.Pboitstjxbckd\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\TypeLib

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\InProcServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\NumMethods

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\NumMethods

HKEY_CLASSES_ROOT\CLSID\{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\boitsqu.DLL
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\InProcServer32
ThreadingModel = "Both"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
{EFD959DC-3B3E-426d-9F96-6686C1963329} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
{B3A6E4C7-3FCA-4235-9B2D-3A302EDFC6F2} = "{random values}"

Dropping Routine

This Trojan drops the following files:

%User Temp%\don1.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.)

This report is generated via an automated analysis system.

SOLUTION

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_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- {D91A85D4-5542-4488-939D-1CD3982F8068}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- boitsqu.DLL

In HKEY_CLASSES_ROOT
- xyudamzspdorzbp.Mxjkmfrlfvmoq.1

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Mxjkmfrlfvmoq.1
- CLSID

In HKEY_CLASSES_ROOT
- xyudamzspdorzbp.Mxjkmfrlfvmoq

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Mxjkmfrlfvmoq
- CLSID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Mxjkmfrlfvmoq
- CurVer

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {9A72C7A1-DBE2-414E-B480-7C428DF22301}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- ProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- VersionIndependentProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- Programmable

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- InprocServer32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- TypeLib

In HKEY_CLASSES_ROOT
- xyudamzspdorzbp.Pboitstjxbckd.1

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Pboitstjxbckd.1
- CLSID

In HKEY_CLASSES_ROOT
- xyudamzspdorzbp.Pboitstjxbckd

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Pboitstjxbckd
- CLSID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\xyudamzspdorzbp.Pboitstjxbckd
- CurVer

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- ProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- VersionIndependentProgID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- Programmable

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- InprocServer32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- TypeLib

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

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {F48BAF30-CFED-46ED-8914-75BE61D18A76}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}
- 1.0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0
- FLAGS

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0
- 0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0\0
- win32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F48BAF30-CFED-46ED-8914-75BE61D18A76}\1.0
- HELPDIR

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {64C3D50E-BD89-4E6E-A24F-22CC723B375B}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
- TypeLib

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {F8065EF7-8C20-48B7-87E9-AA58C1456C3A}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
- TypeLib

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {64C3D50E-BD89-4E6E-A24F-22CC723B375B}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
- InProcServer32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
- NumMethods

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
- NumMethods

In HKEY_CLASSES_ROOT\CLSID
- {49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}

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>Classes>AppID
Still in the left panel, locate and delete the key:
{D91A85D4-5542-4488-939D-1CD3982F8068}
Again Still in the left panel, locate and delete the key:
boitsqu.DLL
In the left panel, double-click the following:
HKEY_CLASSES_ROOT
Still in the left panel, locate and delete the key:
xyudamzspdorzbp.Mxjkmfrlfvmoq.1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>xyudamzspdorzbp.Mxjkmfrlfvmoq.1
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
xyudamzspdorzbp.Mxjkmfrlfvmoq
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>xyudamzspdorzbp.Mxjkmfrlfvmoq
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:
{9A72C7A1-DBE2-414E-B480-7C428DF22301}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{9A72C7A1-DBE2-414E-B480-7C428DF22301}
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:
xyudamzspdorzbp.Pboitstjxbckd.1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>xyudamzspdorzbp.Pboitstjxbckd.1
Still in the left panel, locate and delete the key:
CLSID
Again Still in the left panel, locate and delete the key:
xyudamzspdorzbp.Pboitstjxbckd
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>xyudamzspdorzbp.Pboitstjxbckd
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:
{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
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>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:
{F48BAF30-CFED-46ED-8914-75BE61D18A76}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{F48BAF30-CFED-46ED-8914-75BE61D18A76}
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>{F48BAF30-CFED-46ED-8914-75BE61D18A76}>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>{F48BAF30-CFED-46ED-8914-75BE61D18A76}>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:
{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
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:
{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}
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:
{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{64C3D50E-BD89-4E6E-A24F-22CC723B375B}
Still in the left panel, locate and delete the key:
InProcServer32
Again Still in the left panel, locate and delete the key:
NumMethods
Again Still in the left panel, locate and delete the key:
NumMethods
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID
Still in the left panel, locate and delete the key:
{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
Close Registry Editor.

Step 4

Delete this registry value

[ Learn More ]

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\boitsqu.DLL
- AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{9A72C7A1-DBE2-414E-B480-7C428DF22301}
- AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
- NoExplorer = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\TypeLib
- Version = "1.0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}\TypeLib
- Version = "1.0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{64C3D50E-BD89-4E6E-A24F-22CC723B375B}\InProcServer32
- ThreadingModel = "Both"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
- {EFD959DC-3B3E-426d-9F96-6686C1963329} = "{random values}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
- {B3A6E4C7-3FCA-4235-9B2D-3A302EDFC6F2} = "{random values}"

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>Classes>AppID>boitsqu.DLL
In the right panel, locate and delete the entry:
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{9A72C7A1-DBE2-414E-B480-7C428DF22301}>InprocServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{9A72C7A1-DBE2-414E-B480-7C428DF22301}
In the right panel, locate and delete the entry:
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}>InprocServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
In the right panel, locate and delete the entry:
AppID = "{D91A85D4-5542-4488-939D-1CD3982F8068}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Browser Helper Objects>{4B7B8BCE-7E00-450D-BFBF-4F49F21BE610}
In the right panel, locate and delete the entry:
NoExplorer = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{64C3D50E-BD89-4E6E-A24F-22CC723B375B}>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>{F8065EF7-8C20-48B7-87E9-AA58C1456C3A}>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>CLSID>{64C3D50E-BD89-4E6E-A24F-22CC723B375B}>InProcServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Both"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{49AE8F1B-54E7-4d8b-AE22-A1B4D709230B}
In the right panel, locate and delete the entry:
{EFD959DC-3B3E-426d-9F96-6686C1963329} = "{random values}"
Again In the right panel, locate and delete the entry:
{B3A6E4C7-3FCA-4235-9B2D-3A302EDFC6F2} = "{random values}"
Close Registry Editor.

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%\don1.tmp

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.IRE. 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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