➔
search
✕

TrojanSpy.Win32.SCRATCHAU.A

April 24, 2020
 ALIASES:

Trojan.Gen.2 (Symantec); Trojan.Win32.SchoolBoy.bab (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan Spy 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:

4,714,496 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Apr 2020

Arrival Details

This Trojan Spy 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 Spy adds the following processes:

  • {malware file path and name} /nstart
  • %User Temp%\vllakqx.exe /HomeRegAccess10
  • Rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %User Temp%\~yarqpes.inf
  • %User Temp%\rqilrcw.exe /HomeRegAccess10
  • %User Temp%\aawclxz.exe /HomeRegAccess10
  • Rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %User Temp%\~qqkyubo.inf
  • %System%\PING.EXE ping -n 2 127.0.0.1

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

It creates the following folders:

  • %User Temp%\mxmhgsr
  • %User Temp%\nponazy
  • %User Temp%\hmtpnwi
  • %User Temp%\fskceam
  • %User Temp%\pewjqqd
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5

(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).. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Favorites on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan Spy modifies the following file(s):

  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It deletes the following files:

  • %Favorites%\MSN Websites\MSN Autos.url
  • %Favorites%\Microsoft Websites\Microsoft At Home.url
  • %Favorites%\MSN Websites\MSN Sports.url
  • %Favorites%\Microsoft Websites\Microsoft Store.url
  • %Favorites%\Links for United States\USA.gov.url
  • %Favorites%\Links\desktop.ini
  • %User Startup%\desktop.ini
  • %Favorites%\Windows Live\Windows Live Gallery.url
  • %Favorites%\Windows Live\Windows Live Spaces.url
  • %Favorites%\Windows Live\Get Windows Live.url
  • %Favorites%\MSN Websites\MSN.url
  • %Favorites%\Microsoft Websites\Microsoft At Work.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Google Chrome.lnk
  • %Favorites%\Links\Suggested Sites.url
  • %Favorites%\Microsoft Websites\IE Add-on site.url
  • %Favorites%\Links for United States\GobiernoUSA.gov.url
  • %Favorites%\Microsoft Websites\IE site on Microsoft.com.url
  • %Favorites%\MSN Websites\MSN Money.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Firefox.lnk
  • %User Temp%\vllakqx.exe
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Windows Media Player.lnk
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Windows Explorer.lnk
  • %Favorites%\Windows Live\Windows Live Mail.url
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini
  • %Program Files%\Microsoft Office\Office12\GrooveShellExtensions.dll
  • %User Temp%\aawclxz.exe
  • %Favorites%\desktop.ini
  • %User Temp%\rqilrcw.exe
  • %Favorites%\MSN Websites\MSNBC News.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Acrobat Reader DC.lnk
  • %Favorites%\Links for United States\desktop.ini
  • %Favorites%\Links\Web Slice Gallery.url
  • %Favorites%\MSN Websites\MSN Entertainment.url

It deletes the following folders:

  • %Favorites%\MSN Websites
  • %Favorites%\Windows Live
  • %Favorites%\links
  • %Favorites%\Microsoft Websites
  • %Favorites%\Links for United States
  • %Favorites%\Links

(Note: %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Favorites on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}
(Default) = "Internet Explorer"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\DefaultIcon
(Default) = "%Windows%\SysWOW64\ieframe.dll,-190"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
NoAddOns
(Default) = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
NoAddOns\Command
(Default) = "%Program Files%\Internet Explorer\iexplore.exe -extoff"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
Open
(Default) = "\xe6\x89\x93\xe5\xbc\x80\xe4\xb8\xbb\xe9\xa1\xb5(&H)"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
Open\Command
(Default) = "%Program Files%\Internet Explorer\iexplore.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
Set
(Default) = "\xe5\xb1\x9e\xe6\x80\xa7(&R)"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\
Set\Command
(Default) = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{B5EAD1DB-7C18-4954-8820-01733BC08C82}
(Default) = "Internet Explorer"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Internet Explorer\MAIN
Start Page = "http://www.{BLOCKED}5.com/?31118"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Internet Explorer\MAIN
Default_Page_URL = "http://www.{BLOCKED}5.com/?31118"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Internet Explorer\MAIN
First Home Page = "http://www.{BLOCKED}5.com/?31118"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Baidu\BaiduProtect\LockIEStartPage
Start Page = "http://www.{BLOCKED}5.com/?31118"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\MAIN
First Home Page = "http://www.{BLOCKED}5.com/?31118"

HKEY_LOCAL_MACHINE\SOFTWARE\Baidu\
BaiduProtect\LockIEStartPage
Start Page = "http://www.{BLOCKED}5.com/?31118"

HKEY_CURRENT_USER\Software\PPStream\
main
client = "qudao2@xt058"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Tencent\QQPCMgr
SupplyID = "46137"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Tencent\QQBrowser
SupplyID = "92850"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
ConsentPromptBehaviorAdmin = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
PromptOnSecureDesktop = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesResolve = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
Favorites = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "14"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesVersion = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "15"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "16"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "17"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "18"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
Favorites = "\xff"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "19"

HKEY_CURRENT_USER\Software\Classes\
Local Settings\Software\Microsoft\
Windows\Shell\MuiCache\
%Program Files%\Internet Explorer
iexplore.exe = "Internet Explorer"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband
FavoritesChanges = "20"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\MAIN
Start Page = "http://www.{BLOCKED}5.com/?31118"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\MAIN
Default_Page_URL = "http://www.{BLOCKED}5.com/?31118"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
RunOnceEx\(Default)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnceEx\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
RunOnce\(Default)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run\(Default)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnceEx\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run\
(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer\Browser Helper Objects\(Default)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\(Default)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Taskband\FavoritesResolve

Dropping Routine

This Trojan Spy drops the following files:

  • %Favorites%\links\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %Favorites%\links\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %Favorites%\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %User Temp%\3032brusanu
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %Favorites%\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %Favorites%\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %Favorites%\links\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %User Temp%\704ybkjjdy
  • %Favorites%\links\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %User Temp%\208prucebh
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %User Temp%\2916brusanu
  • %Favorites%\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Internet Explorer.lnk
  • %Favorites%\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %User Temp%\3048jvhvcpa
  • %Favorites%\links\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\links\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %Favorites%\links\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %User Temp%\rqilrcw.exe
  • %User Temp%\vllakqx.exe
  • %User Temp%\aawclxz.exe

(Note: %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Favorites on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

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 TrojanSpy.Win32.SCRATCHAU.A

[ 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 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\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}
    • (Default) = "Internet Explorer"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\DefaultIcon
    • (Default) = "%Windows%\SysWOW64\ieframe.dll,-190"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\NoAddOns
    • (Default) = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\NoAddOns\Command
    • (Default) = "%Program Files%\Internet Explorer\iexplore.exe -extoff"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\Open
    • (Default) = "\xe6\x89\x93\xe5\xbc\x80\xe4\xb8\xbb\xe9\xa1\xb5(&H)"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\Open\Command
    • (Default) = "%Program Files%\Internet Explorer\iexplore.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\Set
    • (Default) = "\xe5\xb1\x9e\xe6\x80\xa7(&R)"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B5EAD1DB-7C18-4954-8820-01733BC08C82}\shell\Set\Command
    • (Default) = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace\{B5EAD1DB-7C18-4954-8820-01733BC08C82}
    • (Default) = "Internet Explorer"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN
    • Start Page = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN
    • Default_Page_URL = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN
    • First Home Page = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Baidu\BaiduProtect\LockIEStartPage
    • Start Page = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN
    • First Home Page = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Baidu\BaiduProtect\LockIEStartPage
    • Start Page = "http://www.{BLOCKED}5.com/?31118"
  • In HKEY_CURRENT_USER\Software\PPStream\main
    • client = "qudao2@xt058"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Tencent\QQPCMgr
    • SupplyID = "46137"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Tencent\QQBrowser
    • SupplyID = "92850"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • ConsentPromptBehaviorAdmin = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • PromptOnSecureDesktop = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • EnableLUA = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesResolve = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • Favorites = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "14"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesVersion = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "15"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "16"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "17"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "18"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • Favorites = "\xff"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "19"
  • In HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\MuiCache\%Program Files%\Internet Explorer
    • iexplore.exe = "Internet Explorer"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesChanges = "20"

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN
    • From: Start Page = "http://www.{BLOCKED}5.com/?31118"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN
    • From: Default_Page_URL = "http://www.{BLOCKED}5.com/?31118"
      To: Default_Page_URL = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""

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.
  • %Favorites%\links\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %Favorites%\links\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %Favorites%\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %User Temp%\3032brusanu
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %Favorites%\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %Favorites%\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %Favorites%\links\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b.url
  • %Favorites%\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\xb0\x8f\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %User Temp%\704ybkjjdy
  • %Favorites%\links\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe4\xba\xac\xe4\xb8\x9c\xe5\x95\x86\xe5\x9f\x8e.url
  • %User Temp%\208prucebh
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbd\x91\xe9\xa1\xb5\xe6\xb8\xb8\xe6\x88\x8f.url
  • %Favorites%\links\xe7\xbd\x91\xe5\x9d\x80\xe5\xaf\xbc\xe8\x88\xaa.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %User Temp%\2916brusanu
  • %Favorites%\xe6\xb8\xb8\xe6\x88\x8f\xe5\x8a\xa0\xe9\x80\x9f.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Internet Explorer.lnk
  • %Favorites%\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %User Temp%\3048jvhvcpa
  • %Favorites%\links\xe6\xb7\x98\xe5\xae\x9d\xe7\xbd\x91.url
  • %Favorites%\links\xe5\x85\x8d\xe8\xb4\xb9\xe7\x94\xb5\xe5\xbd\xb1.url
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5\xe7\xbe\x8e\xe5\xa5\xb3\xe5\x9b\xbe\xe7\x89\x87.url
  • %Favorites%\links\xe5\xa4\xa9\xe7\x8c\xab\xe7\xb2\xbe\xe9\x80\x89.url
  • %User Temp%\rqilrcw.exe
  • %User Temp%\vllakqx.exe
  • %User Temp%\aawclxz.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.
  • %User Temp%\mxmhgsr
  • %User Temp%\nponazy
  • %User Temp%\hmtpnwi
  • %User Temp%\fskceam
  • %User Temp%\pewjqqd
  • %Favorites%\xe9\x93\xbe\xe6\x8e\xa5

Step 7

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.SCRATCHAU.A. 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 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.

    • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini

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.

  • %Favorites%\MSN Websites\MSN Autos.url
  • %Favorites%\Microsoft Websites\Microsoft At Home.url
  • %Favorites%\MSN Websites\MSN Sports.url
  • %Favorites%\Microsoft Websites\Microsoft Store.url
  • %Favorites%\Links for United States\USA.gov.url
  • %Favorites%\Links\desktop.ini
  • %User Startup%\desktop.ini
  • %Favorites%\Windows Live\Windows Live Gallery.url
  • %Favorites%\Windows Live\Windows Live Spaces.url
  • %Favorites%\Windows Live\Get Windows Live.url
  • %Favorites%\MSN Websites\MSN.url
  • %Favorites%\Microsoft Websites\Microsoft At Work.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Google Chrome.lnk
  • %Favorites%\Links\Suggested Sites.url
  • %Favorites%\Microsoft Websites\IE Add-on site.url
  • %Favorites%\Links for United States\GobiernoUSA.gov.url
  • %Favorites%\Microsoft Websites\IE site on Microsoft.com.url
  • %Favorites%\MSN Websites\MSN Money.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Firefox.lnk
  • %User Temp%\vllakqx.exe
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Windows Media Player.lnk
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Windows Explorer.lnk
  • %Favorites%\Windows Live\Windows Live Mail.url
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini
  • %Program Files%\Microsoft Office\Office12\GrooveShellExtensions.dll
  • %User Temp%\aawclxz.exe
  • %Favorites%\desktop.ini
  • %User Temp%\rqilrcw.exe
  • %Favorites%\MSN Websites\MSNBC News.url
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Acrobat Reader DC.lnk
  • %Favorites%\Links for United States\desktop.ini
  • %Favorites%\Links\Web Slice Gallery.url
  • %Favorites%\MSN Websites\MSN Entertainment.url

Step 10

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\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnceEx
    • (Default)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnceEx
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce
    • (Default)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • (Default)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnceEx
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects
    • (Default)
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • (Default)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband
    • FavoritesResolve


Did this description help? Tell us how we did.