TROJ_WEBPREFI.CD


 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It modifies files, disabling programs and applications from properly running.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

487,457 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Jun 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan creates the following folders:

  • %System Root%\ProgramData\Microsoft
  • %System Root%\ProgramData\Microsoft\Windows
  • D:\RECYCLER
  • %System Root%\RECYCLER

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\SessionLog

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\SystemServ

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\SystemUpdate

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\WNetService

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\WNetLog0n

HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\
sErvices\WinLog0n

Other System Modifications

This Trojan modifies the following files:

  • %User Profile%\Application Data\Microsoft

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It deletes the following files:

  • %System Root%\RECYCLER\game.xls
  • %System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll
  • %System Root%\ProgramData\Microsoft\Windows\Intelczu.dll
  • %System Root%\ProgramData\Microsoft\Windows\Svcxca.dll
  • %System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll
  • %System Root%\ProgramData\Microsoft\Windows\Secsmp.dll
  • %System Root%\ProgramData\Microsoft\Windows\Sysehv.dll
  • %System Root%\ProgramData\Microsoft\Windows\NetCC70.ini
  • jpg
  • txt

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog\Parameter

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ\Parameter

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate\Parameter

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService\Parameter

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n\Parameter

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n\Parameter

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog\Parameter

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Cmd

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
CCmd

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
ExeCmd

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\cfeba
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
DisplayName = "SessionLog"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SessionLog\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
SessionLog = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
SessionLog = "%System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\aptll
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
DisplayName = "SystemServ"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ
Description = "Creates a network connections."

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemServ\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Intelczu.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
SystemServ = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
SystemServ = "%System Root%\ProgramData\Microsoft\Windows\Intelczu.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\ugwdg
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
DisplayName = "SystemUpdate"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SystemUpdate\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Svcxca.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
SystemUpdate = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
SystemUpdate = "%System Root%\ProgramData\Microsoft\Windows\Svcxca.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\pbczs
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
DisplayName = "WNetService"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService
Description = "Manage the RPC name service database."

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetService\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
WNetService = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
WNetService = "%System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\htopl
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
DisplayName = "WNetLog0n"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n
Description = "Provide software installation services such as Assign, Publish, and Remove."

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WNetLog0n\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Secsmp.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
WNetLog0n = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
WNetLog0n = "%System Root%\ProgramData\Microsoft\Windows\Secsmp.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\zjxxb
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
DisplayName = "WinLog0n"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog0n\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Sysehv.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
WinLog0n = "idle"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
WinLog0n = "%System Root%\ProgramData\Microsoft\Windows\Sysehv.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\uedsn
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
DisplayName = "WinLog"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WinLog\Parameter
ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\NetBin27.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc
WinLog = "header"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Svc\Path
WinLog = "%System Root%\ProgramData\Microsoft\Windows\NetBin27.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Security\
Cmd
Verdec = "RAR_v1"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\321c041cc0b645556121c95e23b6f3e9.zip
  • %System Root%\ProgramData\Microsoft\Windows\NetBin27.dll
  • %User Temp%\658dfc71714dc5d62bd60adc8b7cd54e.zip
  • %User Profile%\Microsoft\Crypto
  • %User Profile%\Crypto\RSA
  • %User Profile%\RSA\S-1-5-18
  • %System Root%\ProgramData\Microsoft\Windows\NetCC131.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC203.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC344.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC171.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC283.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC345.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC326.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC112.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC324.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC160.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC149.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC0.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC47.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC295.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC225.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC253.html
  • \notepad.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, XP, and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}u.com/gqpgemcuwd
  • http://{BLOCKED}u.com/iwaxsxg
  • http://{BLOCKED}u.com/ocoijxnwkg
  • http://{BLOCKED}u.com/bwhrpbe
  • http://{BLOCKED}u.com/heiwqiu
  • http://{BLOCKED}e.com/gqpgemcuwd
  • http://{BLOCKED}e.com/iwaxsxg
  • http://{BLOCKED}e.com/ocoijxnwkg
  • http://{BLOCKED}e.com/bwhrpbe
  • http://{BLOCKED}e.com/heiwqiu
  • http://hi.{BLOCKED}u.com/gqpgemcuwd/blog
  • http://hi.{BLOCKED}u.com/iwaxsxg/blog
  • http://hi.{BLOCKED}u.com/ocoijxnwkg/blog
  • http://hi.{BLOCKED}u.com/bwhrpbe/blog
  • http://hi.{BLOCKED}u.com/heiwqiu/blog
  • http://{BLOCKED}logr.com/user/gqpgemcuwd

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

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
    • SessionLog
  • In HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\sErvices
    • SystemServ
  • In HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\sErvices
    • SystemUpdate
  • In HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\sErvices
    • WNetService
  • In HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\sErvices
    • WNetLog0n
  • In HKEY_LOCAL_MACHINE\SysTEM\cURrentcontrolsEt\sErvices
    • WinLog0n
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • Parameter
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security
    • Svc
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • Path
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • Parameter
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • Parameter
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • Parameter
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • Parameter
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • Parameter
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • Parameter
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security
    • Cmd
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security
    • CCmd
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security
    • ExeCmd

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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\cfeba
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • DisplayName = "SessionLog"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SessionLog\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • SessionLog = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • SessionLog = "%System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\aptll
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • DisplayName = "SystemServ"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ
    • Description = "Creates a network connections."
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemServ\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Intelczu.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • SystemServ = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • SystemServ = "%System Root%\ProgramData\Microsoft\Windows\Intelczu.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ugwdg
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • DisplayName = "SystemUpdate"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SystemUpdate\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Svcxca.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • SystemUpdate = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • SystemUpdate = "%System Root%\ProgramData\Microsoft\Windows\Svcxca.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\pbczs
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • DisplayName = "WNetService"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService
    • Description = "Manage the RPC name service database."
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetService\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • WNetService = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • WNetService = "%System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\htopl
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • DisplayName = "WNetLog0n"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n
    • Description = "Provide software installation services such as Assign, Publish, and Remove."
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WNetLog0n\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Secsmp.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • WNetLog0n = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • WNetLog0n = "%System Root%\ProgramData\Microsoft\Windows\Secsmp.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\zjxxb
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • DisplayName = "WinLog0n"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog0n\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\Sysehv.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • WinLog0n = "idle"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • WinLog0n = "%System Root%\ProgramData\Microsoft\Windows\Sysehv.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\uedsn
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • DisplayName = "WinLog"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • ImagePath = "%SystemRoot%\system32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WinLog\Parameter
    • ServiceDll = "%System Root%\ProgramData\Microsoft\Windows\NetBin27.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc
    • WinLog = "header"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Svc\Path
    • WinLog = "%System Root%\ProgramData\Microsoft\Windows\NetBin27.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Security\Cmd
    • Verdec = "RAR_v1"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\321c041cc0b645556121c95e23b6f3e9.zip
  • %System Root%\ProgramData\Microsoft\Windows\NetBin27.dll
  • %User Temp%\658dfc71714dc5d62bd60adc8b7cd54e.zip
  • %User Profile%\Microsoft\Crypto
  • %User Profile%\Crypto\RSA
  • %User Profile%\RSA\S-1-5-18
  • %System Root%\ProgramData\Microsoft\Windows\NetCC131.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC203.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC344.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC171.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC283.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC345.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC326.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC112.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC324.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC160.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC149.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC0.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC47.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC295.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC225.html
  • %System Root%\ProgramData\Microsoft\Windows\NetCC253.html
  • \notepad.exe

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\ProgramData\Microsoft
  • %System Root%\ProgramData\Microsoft\Windows
  • D:\RECYCLER
  • %System Root%\RECYCLER

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_WEBPREFI.CD. 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 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.

    • %User Profile%\Application Data\Microsoft

Step 9

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.

  • %System Root%\RECYCLER\game.xls
  • %System Root%\ProgramData\Microsoft\Windows\Sessionemt.dll
  • %System Root%\ProgramData\Microsoft\Windows\Intelczu.dll
  • %System Root%\ProgramData\Microsoft\Windows\Svcxca.dll
  • %System Root%\ProgramData\Microsoft\Windows\Audiosxo.dll
  • %System Root%\ProgramData\Microsoft\Windows\Secsmp.dll
  • %System Root%\ProgramData\Microsoft\Windows\Sysehv.dll
  • %System Root%\ProgramData\Microsoft\Windows\NetCC70.ini
  • jpg
  • txt


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