Ransom_CERBER.DLEV

September 02, 2016

PLATFORM:

Windows

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.

It deletes itself after execution.

TECHNICAL DETAILS

File Size:

376,438 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Sep 2016

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 drops the following copies of itself into the affected system:

%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe

It creates the following folders:

%User Profile%\Application Data\{9702E824-6ED6-DF81-307D-309A34680F2A}
%User Profile%\Microsoft\Speech
%User Profile%\Speech\Files
%User Profile%\Files\UserLexicons

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

Other System Modifications

This Trojan modifies the following file(s):

%System%\WBEM\AutoRecover\88744D2A29102FC88ECF505DD2E984FC.mof

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It deletes the following files:

%User Temp%\tmp2A.tmp
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\Printers\Defaults\
{9C699D07-A998-4135-211E-EE4B073F5726}

HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\
Microsoft\Windows\CurrentVersion\
RunOnce

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Wbem\WMIC

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Wbem\WMIC

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Speech\Voices

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Speech\PhoneConverters

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Speech\CurrentUserLexicon

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon\AppLexicons

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon\{C9E37C15-DF92-4727-85D6-72E5EEB6995A}

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon\{C9E37C15-DF92-4727-85D6-72E5EEB6995A}\
Files

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Speech\AppLexicons

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Speech\AudioOutput

It adds the following registry entries:

HKEY_CURRENT_USER\Printers\Defaults\
{9C699D07-A998-4135-211E-EE4B073F5726}
Component_01 = "{random values}"

HKEY_CURRENT_USER\Printers\Defaults\
{9C699D07-A998-4135-211E-EE4B073F5726}
Component_00 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Command Processor
AutoRun = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

HKEY_CURRENT_USER\Printers\Defaults\
{9C699D07-A998-4135-211E-EE4B073F5726}
Installed = "1"

HKEY_CURRENT_USER\Printers\Defaults\
{9C699D07-A998-4135-211E-EE4B073F5726}
Component_02 = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
mofcompstatus = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
WMICLC = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
mofcompMUIStatus = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
mofcompMUIStatus = "ffffffff"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
Cli.mof = "127360152460000000"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
CliEgAliases.mof = "127360152460000000"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
CliEgAliases.mfl = "127360152460000000"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WMIC
mofcompstatus = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Wbem\WMIC
WMICLC = "49"

HKEY_CURRENT_USER\Software\Microsoft\
Speech\Voices
DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\MSSam"

HKEY_CURRENT_USER\Software\Microsoft\
Speech\PhoneConverters
DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\PhoneConverters\Tokens\English"

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon
CLSID = "{C9E37C15-DF92-4727-85D6-72E5EEB6995A}"

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon
FlushRate = "10"

HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon\{C9E37C15-DF92-4727-85D6-72E5EEB6995A}\
Files
Datafile = "%1a%\Microsoft\Speech\Files\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat"

It modifies the following registry entries:

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
SuperHidden = "1"

HKEY_CURRENT_USER\Control Panel\Desktop
SCRNSAVE.EXE = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

(Note: The default value data of the said registry entry is %Windows%\system32\logon.scr.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "131166938656250000"

(Note: The default value data of the said registry entry is 129689362348742500.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs = "{random characters}"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "131166939141875000"

(Note: The default value data of the said registry entry is 129689362348742500.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\CIMOM
Autorecover MOFs timestamp = "131166939152343750"

(Note: The default value data of the said registry entry is 129689362348742500.)

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
Run = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

Dropping Routine

This Trojan drops the following files:

%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_01
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_00
%User Startup%\dfrgfat.lnk
%User Profile%\Templates\# DECRYPT MY FILES #.html
%User Profile%\Templates\# DECRYPT MY FILES #.txt
%User Profile%\Templates\# DECRYPT MY FILES #.url
%User Profile%\Templates\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.html
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.txt
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.url
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.vbs
%User Profile%\Cookies\# DECRYPT MY FILES #.html
%User Profile%\Cookies\# DECRYPT MY FILES #.txt
%User Profile%\Cookies\# DECRYPT MY FILES #.url
%User Profile%\Cookies\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Music\# DECRYPT MY FILES #.html
%User Profile%\Sample Music\# DECRYPT MY FILES #.txt
%User Profile%\Sample Music\# DECRYPT MY FILES #.url
%User Profile%\Sample Music\# DECRYPT MY FILES #.vbs
%User Temp%\tmp2A.bmp
%Desktop%\# DECRYPT MY FILES #.html
%Desktop%\# DECRYPT MY FILES #.txt
%Desktop%\# DECRYPT MY FILES #.url
%Desktop%\# DECRYPT MY FILES #.vbs
%User Temp%\tmpB.tmp
%User Temp%\tmpF.tmp
%System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
%User Temp%\tmp15.tmp
%System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
%User Profile%\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

http://{BLOCKED}i.com/json
{BLOCKED}.146.130
{BLOCKED}0.1
{BLOCKED}.227.228

It deletes itself after execution.

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

9.8

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

Restart in Safe Mode

[ Learn More ]

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\Printers\Defaults
- {9C699D07-A998-4135-211E-EE4B073F5726}

In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\Microsoft\Windows\CurrentVersion
- RunOnce

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Wbem\
- WMIC

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Wbem\
- WMIC

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech
- Voices

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech
- PhoneConverters

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech
- CurrentUserLexicon

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon
- AppLexicons

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon
- {C9E37C15-DF92-4727-85D6-72E5EEB6995A}

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon\{C9E37C15-DF92-4727-85D6-72E5EEB6995A}
- Files

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech
- AppLexicons

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech
- AudioOutput

To delete the registry key 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 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 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_CURRENT_USER>Printers>Defaults
Still in the left panel, locate and delete the key:
{9C699D07-A998-4135-211E-EE4B073F5726}
In the left panel, double-click the following:
HKEY_USERS>S-1-5-21-1645522239-1292428093-682003330-1003>Software>Microsoft>Windows>CurrentVersion
Still in the left panel, locate and delete the key:
RunOnce
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>>Microsoft>>Wbem>
Still in the left panel, locate and delete the key:
WMIC
In the left panel, double-click the following:
HKEY_CURRENT_USER>SOFTWARE>>Microsoft>>Wbem>
Still in the left panel, locate and delete the key:
WMIC
In the left panel, double-click the following:
HKEY_CURRENT_USER>SOFTWARE>Microsoft>Speech
Still in the left panel, locate and delete the key:
Voices
Again Still in the left panel, locate and delete the key:
PhoneConverters
Again Still in the left panel, locate and delete the key:
CurrentUserLexicon
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>CurrentUserLexicon
Still in the left panel, locate and delete the key:
AppLexicons
Again Still in the left panel, locate and delete the key:
{C9E37C15-DF92-4727-85D6-72E5EEB6995A}
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>CurrentUserLexicon>{C9E37C15-DF92-4727-85D6-72E5EEB6995A}
Still in the left panel, locate and delete the key:
Files
Again Still in the left panel, locate and delete the key:
AppLexicons
Again Still in the left panel, locate and delete the key:
AudioOutput
Close Registry Editor.

Step 5

Delete this registry value

[ Learn More ]

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

In HKEY_CURRENT_USER\Printers\Defaults\{9C699D07-A998-4135-211E-EE4B073F5726}
- Component_01 = "{random values}"

In HKEY_CURRENT_USER\Printers\Defaults\{9C699D07-A998-4135-211E-EE4B073F5726}
- Component_00 = "{random values}"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Command Processor
- AutoRun = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "

In HKEY_CURRENT_USER\Printers\Defaults\{9C699D07-A998-4135-211E-EE4B073F5726}
- Installed = "1"

In HKEY_CURRENT_USER\Printers\Defaults\{9C699D07-A998-4135-211E-EE4B073F5726}
- Component_02 = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- mofcompstatus = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- WMICLC = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- mofcompMUIStatus = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- mofcompMUIStatus = "ffffffff"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- Cli.mof = "127360152460000000"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- CliEgAliases.mof = "127360152460000000"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- CliEgAliases.mfl = "127360152460000000"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WMIC
- mofcompstatus = "1"

In HKEY_CURRENT_USER\Software\Microsoft\Wbem\WMIC
- WMICLC = "49"

In HKEY_CURRENT_USER\Software\Microsoft\Speech\Voices
- DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\MSSam"

In HKEY_CURRENT_USER\Software\Microsoft\Speech\PhoneConverters
- DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\PhoneConverters\Tokens\English"

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon
- CLSID = "{C9E37C15-DF92-4727-85D6-72E5EEB6995A}"

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon
- FlushRate = "10"

In HKEY_CURRENT_USER\Software\Microsoft\Speech\CurrentUserLexicon\{C9E37C15-DF92-4727-85D6-72E5EEB6995A}\Files
- Datafile = "%1a%\Microsoft\Speech\Files\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat"

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 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 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_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>RunOnce
In the right panel, locate and delete the entry:
dfrgfat = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "
In the left panel, double-click the following:
HKEY_CURRENT_USER>Printers>Defaults>{9C699D07-A998-4135-211E-EE4B073F5726}
In the right panel, locate and delete the entry:
Component_01 = "{random values}"
Again In the right panel, locate and delete the entry:
Component_00 = "{random values}"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced
In the right panel, locate and delete the entry:
ShowSuperHidden = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Command Processor
In the right panel, locate and delete the entry:
AutoRun = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "
Again In the right panel, locate and delete the entry:
Installed = "1"
Again In the right panel, locate and delete the entry:
Component_02 = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>WBEM>WMIC
In the right panel, locate and delete the entry:
mofcompstatus = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Wbem>WMIC
In the right panel, locate and delete the entry:
WMICLC = "0"
Again In the right panel, locate and delete the entry:
mofcompMUIStatus = "0"
Again In the right panel, locate and delete the entry:
mofcompMUIStatus = "ffffffff"
Again In the right panel, locate and delete the entry:
Cli.mof = "127360152460000000"
Again In the right panel, locate and delete the entry:
CliEgAliases.mof = "127360152460000000"
Again In the right panel, locate and delete the entry:
CliEgAliases.mfl = "127360152460000000"
Again In the right panel, locate and delete the entry:
mofcompstatus = "1"
Again In the right panel, locate and delete the entry:
WMICLC = "49"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>Voices
In the right panel, locate and delete the entry:
DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\MSSam"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>PhoneConverters
In the right panel, locate and delete the entry:
DefaultTokenId = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\PhoneConverters\Tokens\English"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>CurrentUserLexicon
In the right panel, locate and delete the entry:
CLSID = "{C9E37C15-DF92-4727-85D6-72E5EEB6995A}"
Again In the right panel, locate and delete the entry:
FlushRate = "10"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Speech>CurrentUserLexicon>{C9E37C15-DF92-4727-85D6-72E5EEB6995A}>Files
In the right panel, locate and delete the entry:
Datafile = "%1a%\Microsoft\Speech\Files\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat"
Close Registry Editor.

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "2"
  To: Hidden = ""2""

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- SuperHidden = "1"

In HKEY_CURRENT_USER\Control Panel\Desktop
- From: SCRNSAVE.EXE = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "
  To: SCRNSAVE.EXE = ""%Windows%\system32\logon.scr""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "131166938656250000"
  To: Autorecover MOFs timestamp = ""129689362348742500""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs = "{random characters}"
  To: Autorecover MOFs = ""{random values}""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "131166939141875000"
  To: Autorecover MOFs timestamp = ""129689362348742500""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM
- From: Autorecover MOFs timestamp = "131166939152343750"
  To: Autorecover MOFs timestamp = ""129689362348742500""

To restore registry values this malware/grayware modified:

Open Registry Editor. To do this:
- On Windows 2000, XP, and Server 2003:
  Click Start>Run, type REGEDIT in the text box provided, and then press Enter.
- On Windows Vista, 7, and Server 2008:
  Click the Start button, type REGEDIT in the Search input field then press Enter.
- On Windows 8, 8.1, and Server 2012:
  Right-click on the lower left corner of the screen and click Run, type REGEDIT in the Run input field, and then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced
In the right panel, locate the registry value:
Hidden = "2"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Hidden = "2"
Again In the right panel, locate the registry value:
SuperHidden = "1"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Control Panel>Desktop
In the right panel, locate the registry value:
SCRNSAVE.EXE = "%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe "
Right-click on the value name and choose Modify. Change the value data of this entry to:
SCRNSAVE.EXE = "%Windows%\system32\logon.scr"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>WBEM>CIMOM
In the right panel, locate the registry value:
Autorecover MOFs timestamp = "131166938656250000"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Autorecover MOFs timestamp = "129689362348742500"
Again In the right panel, locate the registry value:
Autorecover MOFs = "{random characters}"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Autorecover MOFs = "{random values}"
Again In the right panel, locate the registry value:
Autorecover MOFs timestamp = "131166939141875000"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Autorecover MOFs timestamp = "129689362348742500"
Again In the right panel, locate the registry value:
Autorecover MOFs timestamp = "131166939152343750"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Autorecover MOFs timestamp = "129689362348742500"
Close Registry Editor.

Step 7

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.

%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_01
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_00
%User Startup%\dfrgfat.lnk
%User Profile%\Templates\# DECRYPT MY FILES #.html
%User Profile%\Templates\# DECRYPT MY FILES #.txt
%User Profile%\Templates\# DECRYPT MY FILES #.url
%User Profile%\Templates\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.html
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.txt
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.url
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.vbs
%User Profile%\Cookies\# DECRYPT MY FILES #.html
%User Profile%\Cookies\# DECRYPT MY FILES #.txt
%User Profile%\Cookies\# DECRYPT MY FILES #.url
%User Profile%\Cookies\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Music\# DECRYPT MY FILES #.html
%User Profile%\Sample Music\# DECRYPT MY FILES #.txt
%User Profile%\Sample Music\# DECRYPT MY FILES #.url
%User Profile%\Sample Music\# DECRYPT MY FILES #.vbs
%User Temp%\tmp2A.bmp
%Desktop%\# DECRYPT MY FILES #.html
%Desktop%\# DECRYPT MY FILES #.txt
%Desktop%\# DECRYPT MY FILES #.url
%Desktop%\# DECRYPT MY FILES #.vbs
%User Temp%\tmpB.tmp
%User Temp%\tmpF.tmp
%System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
%User Temp%\tmp15.tmp
%System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
%User Profile%\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat

To manually delete a malware/grayware file from an affected system:

• For Windows 2000, Windows XP, and Windows Server 2003:

Right-click Start then click Search....
In the File name* input box, type the following:
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_01
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_00
%User Startup%\dfrgfat.lnk
%User Profile%\Templates\# DECRYPT MY FILES #.html
%User Profile%\Templates\# DECRYPT MY FILES #.txt
%User Profile%\Templates\# DECRYPT MY FILES #.url
%User Profile%\Templates\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.html
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.txt
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.url
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.vbs
%User Profile%\Cookies\# DECRYPT MY FILES #.html
%User Profile%\Cookies\# DECRYPT MY FILES #.txt
%User Profile%\Cookies\# DECRYPT MY FILES #.url
%User Profile%\Cookies\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Music\# DECRYPT MY FILES #.html
%User Profile%\Sample Music\# DECRYPT MY FILES #.txt
%User Profile%\Sample Music\# DECRYPT MY FILES #.url
%User Profile%\Sample Music\# DECRYPT MY FILES #.vbs
%User Temp%\tmp2A.bmp
%Desktop%\# DECRYPT MY FILES #.html
%Desktop%\# DECRYPT MY FILES #.txt
%Desktop%\# DECRYPT MY FILES #.url
%Desktop%\# DECRYPT MY FILES #.vbs
%User Temp%\tmpB.tmp
%User Temp%\tmpF.tmp
%System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
%User Temp%\tmp15.tmp
%System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
%User Profile%\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat
In the Look In drop-down list, select My Computer then press Enter.
Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
In the Search Computer/This PC input box, type:
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_01
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\Component_00
%User Startup%\dfrgfat.lnk
%User Profile%\Templates\# DECRYPT MY FILES #.html
%User Profile%\Templates\# DECRYPT MY FILES #.txt
%User Profile%\Templates\# DECRYPT MY FILES #.url
%User Profile%\Templates\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.html
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.txt
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.url
%User Profile%\Sample Pictures\# DECRYPT MY FILES #.vbs
%User Profile%\Cookies\# DECRYPT MY FILES #.html
%User Profile%\Cookies\# DECRYPT MY FILES #.txt
%User Profile%\Cookies\# DECRYPT MY FILES #.url
%User Profile%\Cookies\# DECRYPT MY FILES #.vbs
%User Profile%\Sample Music\# DECRYPT MY FILES #.html
%User Profile%\Sample Music\# DECRYPT MY FILES #.txt
%User Profile%\Sample Music\# DECRYPT MY FILES #.url
%User Profile%\Sample Music\# DECRYPT MY FILES #.vbs
%User Temp%\tmp2A.bmp
%Desktop%\# DECRYPT MY FILES #.html
%Desktop%\# DECRYPT MY FILES #.txt
%Desktop%\# DECRYPT MY FILES #.url
%Desktop%\# DECRYPT MY FILES #.vbs
%User Temp%\tmpB.tmp
%User Temp%\tmpF.tmp
%System%\WBEM\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
%User Temp%\tmp15.tmp
%System%\WBEM\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
%User Profile%\UserLexicons\SP_4C0E8A748F044F21AF910C24EA7443F7.dat
Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 8

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.

%User Profile%\Application Data\{9702E824-6ED6-DF81-307D-309A34680F2A}
%User Profile%\Microsoft\Speech
%User Profile%\Speech\Files
%User Profile%\Files\UserLexicons

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom_CERBER.DLEV. 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 10

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

%System%\WBEM\AutoRecover\88744D2A29102FC88ECF505DD2E984FC.mof

Step 11

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%\tmp2A.tmp
%User Profile%\{9702E824-6ED6-DF81-307D-309A34680F2A}\dfrgfat.exe

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Ransom_CERBER.DLEV

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