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TROJ_KOVTER.E

October 26, 2015
 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 deletes itself after execution.

  TECHNICAL DETAILS

File Size:

412,210 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

13 Oct 2015

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:

  • %Application Data%\ybul
  • %System Root%\_126078_
  • %System Root%\65e6215bfedc7005204198a27843
  • %System Root%\65e6215bfedc7005204198a27843\update

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION

HKEY_CURRENT_USER\Software\51e5db588f

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f

HKEY_LOCAL_MACHINE\SOFTWARE\1603D78BAF16CC17A6

HKEY_LOCAL_MACHINE\SOFTWARE\53C244307B0C3996AAB

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
regsvr32.exe = "22b8"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
iexplore.exe = "22b8"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
regsvr32.exe = "22b8"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
iexplore.exe = "22b8"

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
86bd5df9 = "864"

HKEY_CURRENT_USER\Software\51e5db588f
86bd5df9 = "864"

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
fc7e257e = "B0868A8103329447"

HKEY_CURRENT_USER\Software\51e5db588f
fc7e257e = "B0868A8103329447"

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
93c89353 = "1443208107"

HKEY_CURRENT_USER\Software\51e5db588f
93c89353 = "1443208107"

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
36fb3192 = "{random characters}"

HKEY_CURRENT_USER\Software\51e5db588f
36fb3192 = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
f0fc8a30 = "%Application Data%\ybul\ybul.exe"

HKEY_CURRENT_USER\Software\51e5db588f
f0fc8a30 = "%Application Data%\ybul\ybul.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\1603D78BAF16CC17A6
10659A759CF6C6F2B94B = "10659A759CF6C6F2B94B"

HKEY_LOCAL_MACHINE\SOFTWARE\53C244307B0C3996AAB
E6AA03DF8CBB34D8 = "E6AA03DF8CBB34D8"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Setup
LogLevel = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Setup
LogLevel = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1206 = "0"

(Note: The default value data of the said registry entry is 3.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2300 = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1809 = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
1206 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
2300 = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
1809 = "3"

(Note: The default value data of the said registry entry is 3.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\ybul\ybul.exe
  • %User Temp%\WindowsXP-KB968930-x86-ENG.exe
  • %System Root%\65e6215bfedc7005204198a27843\eventforwarding.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowsremotemanagement.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowsremoteshell.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowspowershellhelp.chm
  • %System Root%\65e6215bfedc7005204198a27843\winrm.cmd
  • %System Root%\65e6215bfedc7005204198a27843\compiledcomposition.microsoft.powershell.gpowershell.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.interop.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.editor.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.editor.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.gpowershell.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.gpowershell.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.graphicalhost.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.graphicalhost.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.runtime.dll
  • %System Root%\65e6215bfedc7005204198a27843\powershell_ise.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\pspluginwkr.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshmsg.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshplugin.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshsip.dll
  • %System Root%\65e6215bfedc7005204198a27843\spmsg.dll
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.dll
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\wevtfwd.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrmprov.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrscmd.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrsmgr.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrssrv.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmauto.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmplpxy.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmres.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmsvc.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmwmipl.dll
  • %System Root%\65e6215bfedc7005204198a27843\powershell.exe
  • %System Root%\65e6215bfedc7005204198a27843\powershell_ise.exe
  • %System Root%\65e6215bfedc7005204198a27843\pscustomsetuputil.exe
  • %System Root%\65e6215bfedc7005204198a27843\pssetupnativeutils.exe
  • %System Root%\65e6215bfedc7005204198a27843\spuninst.exe
  • %System Root%\65e6215bfedc7005204198a27843\spupdsvc.exe
  • %System Root%\65e6215bfedc7005204198a27843\winrs.exe
  • %System Root%\65e6215bfedc7005204198a27843\winrshost.exe
  • %System Root%\65e6215bfedc7005204198a27843\wsmanhttpconfig.exe
  • %System Root%\65e6215bfedc7005204198a27843\wsmprovhost.exe
  • %System Root%\65e6215bfedc7005204198a27843\wtrinstaller.ico
  • %System Root%\65e6215bfedc7005204198a27843\winrm.ini
  • %System Root%\65e6215bfedc7005204198a27843\winrmprov.mof
  • %System Root%\65e6215bfedc7005204198a27843\wsmauto.mof
  • %System Root%\65e6215bfedc7005204198a27843\powershell.exe.mui
  • %System Root%\65e6215bfedc7005204198a27843\profile.ps1
  • %System Root%\65e6215bfedc7005204198a27843\bitstransfer.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\certificate.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\diagnostics.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\dotnettypes.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\filesystem.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\getevent.types.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\help.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\powershellcore.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\powershelltrace.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\registry.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\types.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\wsman.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\bitstransfer.psd1
  • %System Root%\65e6215bfedc7005204198a27843\importallmodules.psd1
  • %System Root%\65e6215bfedc7005204198a27843\about_aliases.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_arithmetic_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_arrays.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_assignment_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_automatic_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_bits_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_break.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_command_precedence.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_command_syntax.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_comment_based_help.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_commonparameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_comparison_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_continue.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_core_commands.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_data_sections.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_debuggers.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_do.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_environment_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_escape_characters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_eventlogs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_execution_policies.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_for.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_foreach.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_format.ps1xml.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced_methods.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced_parameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_cmdletbindingattribute.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_hash_tables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_history.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_if.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_job_details.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_jobs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_join.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_language_keywords.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_line_editing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_locations.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_logical_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_methods.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_modules.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_objects.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_parameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_parsing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_path_syntax.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pipelines.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_preference_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_profiles.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_prompts.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_properties.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_providers.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssession_details.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssessions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssnapins.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_quoting_rules.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_redirection.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_ref.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_regular_expressions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_faq.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_jobs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_output.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_requirements.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_troubleshooting.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_requires.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_reserved_words.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_return.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_scopes.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_script_blocks.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_script_internationalization.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_scripts.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_session_configurations.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_signing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_special_characters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_split.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_switch.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_throw.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_transactions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_trap.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_try_catch_finally.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_type_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_types.ps1xml.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_while.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_wildcards.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_windows_powershell_2.0.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_windows_powershell_ise.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_wmi_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_ws-management_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\default.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\winrm.vbs
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\wsmpty.xsl
  • %System Root%\65e6215bfedc7005204198a27843\wsmtxt.xsl
  • %System Root%\65e6215bfedc7005204198a27843\update\kb968930xp.cat
  • %System Root%\65e6215bfedc7005204198a27843\update\spcustom.dll
  • %System Root%\65e6215bfedc7005204198a27843\update\updspapi.dll
  • %System Root%\65e6215bfedc7005204198a27843\update\update.exe
  • %System Root%\65e6215bfedc7005204198a27843\update\update.inf
  • %System Root%\65e6215bfedc7005204198a27843\update\eula.txt
  • %System Root%\65e6215bfedc7005204198a27843\update\update.ver
  • %System Root%\65e6215bfedc7005204198a27843\$shtdwn$.req

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}2.139.93
  • http://{BLOCKED}2.139.93/{random path}
  • {BLOCKED}0.185.46
  • {BLOCKED}.143.77
  • {BLOCKED}.188.206
  • {BLOCKED}9.220.229
  • {BLOCKED}176.198
  • {BLOCKED}.26.186
  • {BLOCKED}.32.97
  • {BLOCKED}.51.195
  • {BLOCKED}.120.83
  • {BLOCKED}.244.149
  • {BLOCKED}8.8.196
  • {BLOCKED}.129.202
  • {BLOCKED}.48.138
  • {BLOCKED}.217.221
  • {BLOCKED}.37.33
  • {BLOCKED}30.18
  • {BLOCKED}.75.72
  • {BLOCKED}1.73.7
  • {BLOCKED}.16.1
  • {BLOCKED}.218.241
  • {BLOCKED}.71.25
  • {BLOCKED}.110.78
  • {BLOCKED}0.154.80
  • {BLOCKED}94.26
  • {BLOCKED}.255.52
  • {BLOCKED}.201.40
  • {BLOCKED}.124.5
  • {BLOCKED}1.198.18
  • {BLOCKED}65.171
  • {BLOCKED}1.26.128
  • {BLOCKED}.211.216
  • {BLOCKED}123.167
  • {BLOCKED}.122.88
  • {BLOCKED}5.156.209
  • {BLOCKED}.40.177
  • {BLOCKED}0.112.151
  • {BLOCKED}1.183.79
  • {BLOCKED}87.81
  • {BLOCKED}8.167.33
  • {BLOCKED}7.221.7
  • {BLOCKED}1.248.21
  • {BLOCKED}.80.59
  • {BLOCKED}6.202.79
  • {BLOCKED}9.108.89
  • {BLOCKED}.166.52
  • {BLOCKED}3.163.44
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  • {BLOCKED}125.115
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It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

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\Internet Explorer\Main
    • FeatureControl
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
    • FEATURE_BROWSER_EMULATION
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl
    • FEATURE_BROWSER_EMULATION
  • In HKEY_CURRENT_USER\Software
    • 51e5db588f
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 51e5db588f
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 1603D78BAF16CC17A6
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 53C244307B0C3996AAB

Step 3

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\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
    • regsvr32.exe = "22b8"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
    • iexplore.exe = "22b8"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
    • regsvr32.exe = "22b8"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
    • iexplore.exe = "22b8"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
    • 86bd5df9 = "864"
  • In HKEY_CURRENT_USER\Software\51e5db588f
    • 86bd5df9 = "864"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
    • fc7e257e = "B0868A8103329447"
  • In HKEY_CURRENT_USER\Software\51e5db588f
    • fc7e257e = "B0868A8103329447"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
    • 93c89353 = "1443208107"
  • In HKEY_CURRENT_USER\Software\51e5db588f
    • 93c89353 = "1443208107"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
    • 36fb3192 = "{random characters}"
  • In HKEY_CURRENT_USER\Software\51e5db588f
    • 36fb3192 = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\51e5db588f
    • f0fc8a30 = "%Application Data%\ybul\ybul.exe"
  • In HKEY_CURRENT_USER\Software\51e5db588f
    • f0fc8a30 = "%Application Data%\ybul\ybul.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\1603D78BAF16CC17A6
    • 10659A759CF6C6F2B94B = "10659A759CF6C6F2B94B"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\53C244307B0C3996AAB
    • E6AA03DF8CBB34D8 = "E6AA03DF8CBB34D8"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup
    • LogLevel = "2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup
    • LogLevel = "0"

Step 4

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\Internet Settings\Zones\3
    • From: 1206 = "0"
      To: 1206 = ""3""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • From: 2300 = "0"
      To: 2300 = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • 1809 = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    • 1206 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    • From: 2300 = "0"
      To: 2300 = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    • From: 1809 = "3"
      To: 1809 = ""3""

Step 5

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.
  • %Application Data%\ybul\ybul.exe
  • %User Temp%\WindowsXP-KB968930-x86-ENG.exe
  • %System Root%\65e6215bfedc7005204198a27843\eventforwarding.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowsremotemanagement.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowsremoteshell.adm
  • %System Root%\65e6215bfedc7005204198a27843\windowspowershellhelp.chm
  • %System Root%\65e6215bfedc7005204198a27843\winrm.cmd
  • %System Root%\65e6215bfedc7005204198a27843\compiledcomposition.microsoft.powershell.gpowershell.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.interop.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.editor.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.editor.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.gpowershell.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.gpowershell.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.graphicalhost.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.graphicalhost.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.runtime.dll
  • %System Root%\65e6215bfedc7005204198a27843\powershell_ise.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\pspluginwkr.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshmsg.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshplugin.dll
  • %System Root%\65e6215bfedc7005204198a27843\pwrshsip.dll
  • %System Root%\65e6215bfedc7005204198a27843\spmsg.dll
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.dll
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.resources.dll
  • %System Root%\65e6215bfedc7005204198a27843\wevtfwd.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrmprov.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrscmd.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrsmgr.dll
  • %System Root%\65e6215bfedc7005204198a27843\winrssrv.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmauto.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmplpxy.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmres.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmsvc.dll
  • %System Root%\65e6215bfedc7005204198a27843\wsmwmipl.dll
  • %System Root%\65e6215bfedc7005204198a27843\powershell.exe
  • %System Root%\65e6215bfedc7005204198a27843\powershell_ise.exe
  • %System Root%\65e6215bfedc7005204198a27843\pscustomsetuputil.exe
  • %System Root%\65e6215bfedc7005204198a27843\pssetupnativeutils.exe
  • %System Root%\65e6215bfedc7005204198a27843\spuninst.exe
  • %System Root%\65e6215bfedc7005204198a27843\spupdsvc.exe
  • %System Root%\65e6215bfedc7005204198a27843\winrs.exe
  • %System Root%\65e6215bfedc7005204198a27843\winrshost.exe
  • %System Root%\65e6215bfedc7005204198a27843\wsmanhttpconfig.exe
  • %System Root%\65e6215bfedc7005204198a27843\wsmprovhost.exe
  • %System Root%\65e6215bfedc7005204198a27843\wtrinstaller.ico
  • %System Root%\65e6215bfedc7005204198a27843\winrm.ini
  • %System Root%\65e6215bfedc7005204198a27843\winrmprov.mof
  • %System Root%\65e6215bfedc7005204198a27843\wsmauto.mof
  • %System Root%\65e6215bfedc7005204198a27843\powershell.exe.mui
  • %System Root%\65e6215bfedc7005204198a27843\profile.ps1
  • %System Root%\65e6215bfedc7005204198a27843\bitstransfer.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\certificate.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\diagnostics.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\dotnettypes.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\filesystem.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\getevent.types.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\help.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\powershellcore.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\powershelltrace.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\registry.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\types.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\wsman.format.ps1xml
  • %System Root%\65e6215bfedc7005204198a27843\bitstransfer.psd1
  • %System Root%\65e6215bfedc7005204198a27843\importallmodules.psd1
  • %System Root%\65e6215bfedc7005204198a27843\about_aliases.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_arithmetic_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_arrays.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_assignment_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_automatic_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_bits_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_break.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_command_precedence.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_command_syntax.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_comment_based_help.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_commonparameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_comparison_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_continue.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_core_commands.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_data_sections.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_debuggers.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_do.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_environment_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_escape_characters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_eventlogs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_execution_policies.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_for.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_foreach.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_format.ps1xml.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced_methods.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_advanced_parameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_functions_cmdletbindingattribute.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_hash_tables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_history.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_if.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_job_details.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_jobs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_join.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_language_keywords.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_line_editing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_locations.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_logical_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_methods.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_modules.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_objects.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_parameters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_parsing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_path_syntax.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pipelines.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_preference_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_profiles.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_prompts.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_properties.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_providers.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssession_details.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssessions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_pssnapins.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_quoting_rules.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_redirection.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_ref.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_regular_expressions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_faq.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_jobs.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_output.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_requirements.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_remote_troubleshooting.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_requires.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_reserved_words.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_return.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_scopes.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_script_blocks.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_script_internationalization.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_scripts.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_session_configurations.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_signing.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_special_characters.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_split.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_switch.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_throw.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_transactions.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_trap.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_try_catch_finally.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_type_operators.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_types.ps1xml.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_variables.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_while.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_wildcards.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_windows_powershell_2.0.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_windows_powershell_ise.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_wmi_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\about_ws-management_cmdlets.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\default.help.txt
  • %System Root%\65e6215bfedc7005204198a27843\winrm.vbs
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.backgroundintelligenttransfer.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.diagnostics.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.commands.utility.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.consolehost.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.powershell.security.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\microsoft.wsman.management.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\system.management.automation.dll-help.xml
  • %System Root%\65e6215bfedc7005204198a27843\wsmpty.xsl
  • %System Root%\65e6215bfedc7005204198a27843\wsmtxt.xsl
  • %System Root%\65e6215bfedc7005204198a27843\update\kb968930xp.cat
  • %System Root%\65e6215bfedc7005204198a27843\update\spcustom.dll
  • %System Root%\65e6215bfedc7005204198a27843\update\updspapi.dll
  • %System Root%\65e6215bfedc7005204198a27843\update\update.exe
  • %System Root%\65e6215bfedc7005204198a27843\update\update.inf
  • %System Root%\65e6215bfedc7005204198a27843\update\eula.txt
  • %System Root%\65e6215bfedc7005204198a27843\update\update.ver
  • %System Root%\65e6215bfedc7005204198a27843\$shtdwn$.req

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.
  • %Application Data%\ybul
  • %System Root%\_126078_
  • %System Root%\65e6215bfedc7005204198a27843
  • %System Root%\65e6215bfedc7005204198a27843\update

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_KOVTER.E. 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 these deleted registry keys/values from backup

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

  • In HKEY_LOCAL_MACHINE
    • SOFTWARE


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