Backdoor.Win32.ZEGOST.THJOBAI

November 13, 2019
 ALIASES:

GenericRXAG-GP!B42747B21502 (McAfee); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Backdoor 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:

858,112 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Nov 2019

Arrival Details

This Backdoor 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 Backdoor adds the following processes:

  • %Windows%\Microsoft.NET\Framework\aspnet_wp.exe
  • cacls %Fonts%\*.exe /e /d system
  • x64.exe
  • %Windows%\Help\Winlogon.exe
  • netsh ipsec static add policy name=Block
  • netsh ipsec static add filterlist name=Filter1
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=135 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=135 protocol=UDP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=139 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=139 protocol=UDP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=445 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=445 protocol=UDP
  • netsh ipsec static add filteraction name=FilteraAtion1 action=block
  • netsh ipsec static add rule name=Rule1 policy=Block filterlist=Filter1 filteraction=FilteraAtion1
  • netsh ipsec static set policy name=Block assign=y
  • cmd.exe /c del "%User Temp%\x64.exe"
  • %System%\svchost.exe
  • %Windows%\Cursors\TrustedInsteller.exe -a cryptonight -o stratum+tcp://pool.usa-138.com:80 -u 4B7yFmYw2qvEtWZDDnZVeY16HHpwTtuYBg6EMn5xdDbM3ggSEnQFDWDHH6cqdEYaPx4iQvAwLNu8NLc21QxDU84GGxZEY7S -p x
  • %Windows%\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe
  • %System%\svchost.exe -k LocalServiceAndNoImpersonation
  • %Windows%\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe
  • %System%\svchost.exe -k WerSvcGroup

Autostart Technique

This Backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\clr_optimization_v3.0.50727_64
ImagePath = "%Windows%\Microsoft.NET\Framework\mscorsvws.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinHelpSvcs
ImagePath = "%Windows%\Help\HelpSvc.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Protect_Proccess
ImagePath = "%User Temp%\Protect_Proccess"

Other System Modifications

This Backdoor deletes the following files:

  • %Windows%\LastGood.Tmp

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\clr_optimization_v3.0.50727_64\Description

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\clr_optimization_v3.0.50727_64\Parameters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\clr_optimization_v3.0.50727_64\Parameters\
Application

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinHelpSvcs\Parameters

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\clr_optimization_v3.0.50727_64
Displayname = "Microsoft .NET Framework NGEN v3.5.50727_X64"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\clr_optimization_v3.0.50727_64
Description = "Microsoft .NET Framework NGEN."

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\clr_optimization_v3.0.50727_64\Parameters
Application = "aspnet_wp.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\WinHelpSvcs
Displayname = "Help and Support Services."

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\WinHelpSvcs
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\WinHelpSvcs\Parameters
Application = "Winlogon.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\WinStations\
RDP-Tcp
UserAuthentication = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
className = "ipsecISAKMPPolicy"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
name = "ipsecISAKMPPolicy{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
ipsecID = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
ipsecDataType = "256"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
ipsecData = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
whenChanged = "1561405666"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
className = "ipsecNegotiationPolicy"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
name = "ipsecNegotiationPolicy{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecID = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecNegotiationPolicyAction = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecNegotiationPolicyType = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecDataType = "256"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecData = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
whenChanged = "1561405667"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
className = "ipsecPolicy"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
name = "ipsecPolicy{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecName = "Block"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecID = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecDataType = "256"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecData = "c! LO\xd1\x11\x86;\x00\xa0$\x8d0!\x04\x00\x00\x000*\x00\x00\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecISAKMPReference = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
whenChanged = "1561405666"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}
ipsecOwnersReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
className = "ipsecNFA"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
name = "ipsecNFA{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecID = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecDataType = "256"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecData = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecNegotiationPolicyReference = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
whenChanged = "1561405667"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecNFAReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecOwnersReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecOwnersReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
className = "ipsecFilter"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
name = "ipsecFilter{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecName = "Filter1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecID = "{{GUID}}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecDataType = "256"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecData = "\xb5 \xdc\x80\xc8.\xd1\x11\xa8\x9e\x00\xa0$\x8d0!\x00\x00\x00\x00\x00\x00\x00\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405667"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecData = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405668"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405670"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\COMSysApp
DeleteFlag = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405623"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405625"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405627"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
whenChanged = "1561405683"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
ipsecName = "FilteraAtion1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}
whenChanged = "1561405636"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecName = "Rule1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
ipsecFilterReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}
whenChanged = "1561405689"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
ipsecNFAReference = "\x00\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}
ipsecOwnersReference = "\x00"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
whenChanged = "1561405690"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}
whenChanged = "1561405692"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local
ActivePolicy = "SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSec
OperationMode = "3"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\clr_optimization_v3.0.50727_64
DisplayName = "clr_optimization_v3.0.50727_64"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\clr_optimization_v3.0.50727_64
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinHelpSvcs
DisplayName = "WinHelpSvcs"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinHelpSvcs
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Protect_Proccess
DisplayName = "Protect_Proccess"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Protect_Proccess
Start = "SERVICE_DEMAND_START"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\LanmanServer
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Schedule
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\COMSysApp
Start = "4"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\PolicyAgent
Start = "2"

(Note: The default value data of the said registry entry is 2.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Protect_Proccess\Enum

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Protect_Proccess

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNegotiationPolicy{{GUID}}\
description

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecPolicy{{GUID}}\
description

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecNFA{{GUID}}\
description

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecFilter{{GUID}}\
description

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\IPSEC\
Policy\Local\ipsecISAKMPPolicy{{GUID}}\
ipsecOwnersReference

Dropping Routine

This Backdoor drops the following files:

  • %User Temp%\Protect_Proccess
  • %User Temp%\x64.exe
  • %Windows%\Help\active_desktop_render_New.dll
  • %Windows%\MpMgSvc.dll
  • %Windows%\Cursors\TrustedInsteller.exe
  • %Windows%\Help\HelpSvc.exe
  • %Windows%\Help\active_desktop_render.dll
  • %Windows%\Help\Winlogon.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This Backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}i.com/11.exe
  • http://{BLOCKED}h.com/Update.txt
  • http://wmi.{BLOCKED}8.com
  • http://pool.{BLOCKED}8.com

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Backdoor.Win32.ZEGOST.THJOBAI

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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\SYSTEM\CurrentControlSet\services\clr_optimization_v3.0.50727_64
    • Description
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\clr_optimization_v3.0.50727_64
    • Parameters
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\clr_optimization_v3.0.50727_64\Parameters
    • Application
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinHelpSvcs
    • Parameters
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ipsecISAKMPPolicy{{GUID}}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ipsecNegotiationPolicy{{GUID}}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ipsecPolicy{{GUID}}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ipsecNFA{{GUID}}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ipsecFilter{{GUID}}

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\clr_optimization_v3.0.50727_64
    • Displayname = "Microsoft .NET Framework NGEN v3.5.50727_X64"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\clr_optimization_v3.0.50727_64
    • Description = "Microsoft .NET Framework NGEN."
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\clr_optimization_v3.0.50727_64\Parameters
    • Application = "aspnet_wp.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WinHelpSvcs
    • Displayname = "Help and Support Services."
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WinHelpSvcs
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WinHelpSvcs\Parameters
    • Application = "Winlogon.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\WinStations\RDP-Tcp
    • UserAuthentication = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • className = "ipsecISAKMPPolicy"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • name = "ipsecISAKMPPolicy{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • ipsecID = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • ipsecDataType = "256"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • ipsecData = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • whenChanged = "1561405666"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • className = "ipsecNegotiationPolicy"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • name = "ipsecNegotiationPolicy{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecID = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecNegotiationPolicyAction = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecNegotiationPolicyType = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecDataType = "256"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecData = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • whenChanged = "1561405667"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • className = "ipsecPolicy"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • name = "ipsecPolicy{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecName = "Block"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecID = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecDataType = "256"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecData = "c! LO\xd1\x11\x86;\x00\xa0$\x8d0!\x04\x00\x00\x000*\x00\x00\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecISAKMPReference = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • whenChanged = "1561405666"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • ipsecOwnersReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • className = "ipsecNFA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • name = "ipsecNFA{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecID = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecDataType = "256"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecData = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecNegotiationPolicyReference = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • whenChanged = "1561405667"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecNFAReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecOwnersReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecOwnersReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • className = "ipsecFilter"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • name = "ipsecFilter{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecName = "Filter1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecID = "{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecDataType = "256"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecData = "\xb5 \xdc\x80\xc8.\xd1\x11\xa8\x9e\x00\xa0$\x8d0!\x00\x00\x00\x00\x00\x00\x00\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405667"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecData = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405668"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405670"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\COMSysApp
    • DeleteFlag = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405623"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405625"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405627"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • whenChanged = "1561405683"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • ipsecName = "FilteraAtion1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • whenChanged = "1561405636"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecName = "Rule1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • ipsecFilterReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • whenChanged = "1561405689"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • ipsecNFAReference = "\x00\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • ipsecOwnersReference = "\x00"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • whenChanged = "1561405690"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • whenChanged = "1561405692"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local
    • ActivePolicy = "SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSec
    • OperationMode = "3"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\clr_optimization_v3.0.50727_64
    • DisplayName = "clr_optimization_v3.0.50727_64"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\clr_optimization_v3.0.50727_64
    • Start = "SERVICE_AUTO_START"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinHelpSvcs
    • DisplayName = "WinHelpSvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinHelpSvcs
    • Start = "SERVICE_AUTO_START"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Protect_Proccess
    • DisplayName = "Protect_Proccess"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Protect_Proccess
    • Start = "SERVICE_DEMAND_START"

Step 5

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanServer
    • From: Start = "4"
      To: Start = ""2""
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Schedule
    • From: Start = "4"
      To: Start = ""2""
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\COMSysApp
    • From: Start = "4"
      To: Start = ""3""
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\PolicyAgent
    • From: Start = "2"
      To: Start = ""2""

Step 6

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 Temp%\Protect_Proccess
  • %User Temp%\x64.exe
  • %Windows%\Help\active_desktop_render_New.dll
  • %Windows%\MpMgSvc.dll
  • %Windows%\Cursors\TrustedInsteller.exe
  • %Windows%\Help\HelpSvc.exe
  • %Windows%\Help\active_desktop_render.dll
  • %Windows%\Help\Winlogon.exe

Step 7

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.ZEGOST.THJOBAI. 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 the following Trend Micro Support pages for more information:

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Windows%\LastGood.Tmp

Step 9

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\SYSTEM\ControlSet001\services\Protect_Proccess
    • Enum
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services
    • Protect_Proccess
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNegotiationPolicy{{GUID}}
    • description
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecPolicy{{GUID}}
    • description
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecNFA{{GUID}}
    • description
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecFilter{{GUID}}
    • description
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSEC\Policy\Local\ipsecISAKMPPolicy{{GUID}}
    • ipsecOwnersReference


Did this description help? Tell us how we did.