TROJ_DLOAD.WII


 ALIASES:

Trojan.Gen.2 (Symantec); AdWare.Win32.PopAd.aqx (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 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.

  TECHNICAL DETAILS

File Size:

3,477,576 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jan 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:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsq5.tmp
  • %System Root%\Documents and Settings\Wilbert
  • %User Profile%\Application Data\Savepop
  • %User Temp%\nsh11.tmp
  • %User Profile%\Application Data\WizLine

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
savepop = "%User Profile%\Savepop\savepopagent.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
wizline = "%User Profile%\WizLine\WizLineAgent.exe"

It 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\savepopprotector32

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsl3.tmp
  • %User Temp%\nsq5.tmp
  • %User Temp%\nssF.tmp
  • %User Temp%\nsh11.tmp
  • %User Temp%\SAVEPO~1.EXE
  • %System Root%\DelUS.bat

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

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Savepop

HKEY_CURRENT_USER\Software\Savepop\
Update

HKEY_CLASSES_ROOT\WizLine.WizLineToolBar.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WizLine.WizLineToolBar.1\CLSID

HKEY_CLASSES_ROOT\WizLine.WizLineToolBar

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WizLine.WizLineToolBar\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WizLine.WizLineToolBar\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\TypeLib

HKEY_CURRENT_USER\Software\WizLine

HKEY_CURRENT_USER\Software\WizLine\
Update

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Low Rights\ElevationPolicy\
{1828AC12-123C-23SS-A233-123456789101}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Savepop
pid = "13"

HKEY_CURRENT_USER\Software\Savepop
xml = "wizline13"

HKEY_CURRENT_USER\Software\Savepop
dll = "hidisk.dll"

HKEY_CURRENT_USER\Software\Savepop\
Update
ver = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\savepopprotector32
DisplayName = "savepopprotector32"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\savepopprotector32
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\savepopprotector32
ImagePath = "system32\DRIVERS\savepopprotector32.sys"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\savepopprotector32
Start = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\savepopprotector32
Type = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Toolbar
{A28C812E-9967-447B-A842-C386DF16B3FB} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\InprocServer32
ThreadingModel = "Apartment"

HKEY_CURRENT_USER\Software\WizLine
dir = "%User Profile%\Application Data\WizLine"

HKEY_CURRENT_USER\Software\WizLine
pid = "13"

HKEY_CURRENT_USER\Software\WizLine
a_id = "eyesis"

HKEY_CURRENT_USER\Software\WizLine\
Update
ver = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Low Rights\ElevationPolicy\
{1828AC12-123C-23SS-A233-123456789101}
AppName = "wzcart.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Low Rights\ElevationPolicy\
{1828AC12-123C-23SS-A233-123456789101}
AppPath = "%User Profile%\Application Data\WizLine"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Low Rights\ElevationPolicy\
{1828AC12-123C-23SS-A233-123456789101}
Policy = "3"

HKEY_CURRENT_USER\Software\Savepop
install = "20141229"

HKEY_CURRENT_USER\Software\Savepop
today = "20141229"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\savepop_agent.exe
  • %User Temp%\wizline_agent.exe
  • %User Temp%\nsq5.tmp\KillProcDLL.dll
  • %User Temp%\nsq5.tmp\DLLWebCount.dll
  • %User Profile%\Savepop\hidisk.dll
  • %User Profile%\Savepop\savepop.exe
  • %User Profile%\Savepop\savepopagent.exe
  • %User Profile%\Savepop\savepopprotector32.sys
  • %User Profile%\Savepop\savepopprotector64.dll
  • %User Profile%\Savepop\savepopuninstall.exe
  • %User Temp%\nsq5.tmp\System.dll
  • %System%\drivers\savepopprotector32.sys
  • %User Temp%\nsq5.tmp\GetVersion.dll
  • %User Temp%\nsq5.tmp\SelfDelete.dll
  • \DelUS.bat
  • %User Temp%\nsh11.tmp\KillProcDLL.dll
  • %User Temp%\nsh11.tmp\DLLWaitForKillProgram.dll
  • %User Temp%\nsh11.tmp\DLLWebCount.dll
  • %User Profile%\WizLine\WizLine.dll
  • %User Profile%\WizLine\WizLineAgent.exe
  • %User Profile%\WizLine\WizLineUninstall.exe
  • %User Profile%\WizLine\wzcart.exe
  • %User Temp%\nsh11.tmp\GetVersion.dll

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://savepop.{BLOCKED}o.kr/app/download/partner/13/savepop_agent.exe
  • http://wizline.{BLOCKED}o.kr/app/download/partner/13/wizline_agent.exe
  • http://trs.{BLOCKED}p.co.kr/c_log.php?{random characters}
  • http://openkeyword.{BLOCKED}o.kr/mmsv/Access3.php?{random characters}
  • {BLOCKED}0.1
  • {BLOCKED}.71.203
  • {BLOCKED}.71.201
  • {BLOCKED}.1.211

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

Step 1

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

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

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
    • savepopprotector32
  • In HKEY_CURRENT_USER\Software
    • Savepop
  • In HKEY_CURRENT_USER\Software\Savepop
    • Update
  • In HKEY_CLASSES_ROOT
    • WizLine.WizLineToolBar.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WizLine.WizLineToolBar.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • WizLine.WizLineToolBar
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WizLine.WizLineToolBar
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WizLine.WizLineToolBar
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {A28C812E-9967-447B-A842-C386DF16B3FB}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}
    • TypeLib
  • In HKEY_CURRENT_USER\Software
    • WizLine
  • In HKEY_CURRENT_USER\Software\WizLine
    • Update
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Low Rights\ElevationPolicy
    • {1828AC12-123C-23SS-A233-123456789101}

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • savepop = "%User Profile%\Savepop\savepopagent.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • wizline = "%User Profile%\WizLine\WizLineAgent.exe"
  • In HKEY_CURRENT_USER\Software\Savepop
    • pid = "13"
  • In HKEY_CURRENT_USER\Software\Savepop
    • xml = "wizline13"
  • In HKEY_CURRENT_USER\Software\Savepop
    • dll = "hidisk.dll"
  • In HKEY_CURRENT_USER\Software\Savepop\Update
    • ver = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\savepopprotector32
    • DisplayName = "savepopprotector32"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\savepopprotector32
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\savepopprotector32
    • ImagePath = "system32\DRIVERS\savepopprotector32.sys"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\savepopprotector32
    • Start = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\savepopprotector32
    • Type = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Toolbar
    • {A28C812E-9967-447B-A842-C386DF16B3FB} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A28C812E-9967-447B-A842-C386DF16B3FB}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_CURRENT_USER\Software\WizLine
    • dir = "%User Profile%\Application Data\WizLine"
  • In HKEY_CURRENT_USER\Software\WizLine
    • pid = "13"
  • In HKEY_CURRENT_USER\Software\WizLine
    • a_id = "eyesis"
  • In HKEY_CURRENT_USER\Software\WizLine\Update
    • ver = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{1828AC12-123C-23SS-A233-123456789101}
    • AppName = "wzcart.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{1828AC12-123C-23SS-A233-123456789101}
    • AppPath = "%User Profile%\Application Data\WizLine"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{1828AC12-123C-23SS-A233-123456789101}
    • Policy = "3"
  • In HKEY_CURRENT_USER\Software\Savepop
    • install = "20141229"
  • In HKEY_CURRENT_USER\Software\Savepop
    • today = "20141229"

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.
  • %User Temp%\savepop_agent.exe
  • %User Temp%\wizline_agent.exe
  • %User Temp%\nsq5.tmp\KillProcDLL.dll
  • %User Temp%\nsq5.tmp\DLLWebCount.dll
  • %User Profile%\Savepop\hidisk.dll
  • %User Profile%\Savepop\savepop.exe
  • %User Profile%\Savepop\savepopagent.exe
  • %User Profile%\Savepop\savepopprotector32.sys
  • %User Profile%\Savepop\savepopprotector64.dll
  • %User Profile%\Savepop\savepopuninstall.exe
  • %User Temp%\nsq5.tmp\System.dll
  • %System%\drivers\savepopprotector32.sys
  • %User Temp%\nsq5.tmp\GetVersion.dll
  • %User Temp%\nsq5.tmp\SelfDelete.dll
  • \DelUS.bat
  • %User Temp%\nsh11.tmp\KillProcDLL.dll
  • %User Temp%\nsh11.tmp\DLLWaitForKillProgram.dll
  • %User Temp%\nsh11.tmp\DLLWebCount.dll
  • %User Profile%\WizLine\WizLine.dll
  • %User Profile%\WizLine\WizLineAgent.exe
  • %User Profile%\WizLine\WizLineUninstall.exe
  • %User Profile%\WizLine\wzcart.exe
  • %User Temp%\nsh11.tmp\GetVersion.dll

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%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsq5.tmp
  • %System Root%\Documents and Settings\Wilbert
  • %User Profile%\Application Data\Savepop
  • %User Temp%\nsh11.tmp
  • %User Profile%\Application Data\WizLine

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOAD.WII. 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 this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsl3.tmp
  • %User Temp%\nsq5.tmp
  • %User Temp%\nssF.tmp
  • %User Temp%\nsh11.tmp
  • %User Temp%\SAVEPO~1.EXE
  • %System Root%\DelUS.bat


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