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Adware.Win32.CYDOOR.AB

October 31, 2019
 ALIASES:

Adware.Cydoor (Symantec); AdWare.Win32.Cydoor (Kaspersky); Cydoor (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Adware 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:

1,771,393 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

31 Oct 2019

Arrival Details

This Adware 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 Adware adds the following processes:

  • %User Temp%\INS5D1C.tmp /SL3 $5009C %User Temp%\1785a63d66abfa0c697020d3e96b21b52a7ce5f9.exe 1744504 1747965 61440
  • %Windows%\temp\Adware\cd_install_291.exe
  • "%Program Files%\KaZaA\Kazaa.exe"
  • "%User Temp%\V9a00364\cduninst.exe" 253
  • %User Temp%\V9a00364\cduninst.exe 253
  • "%User Temp%\V9a00364\RUNDLL32.EXE" cd_clint.dll,ServiceRunDll i
  • %User Temp%\V9a00364\RUNDLL32.EXE cd_clint.dll,ServiceRunDll i
  • rundll32.exe %User Temp%\V9a00364\cd_clint.dll,ServiceRunDll q_253

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %User Temp%\V9a00364\adverck
  • %Windows%\Temp\Adware
  • %User Temp%\V9a00364
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop
  • %Program Files%\KaZaA
  • %Program Files%\KaZaA\My Shared Folder\Certified
  • %Program Files%\KaZaA\Db
  • %Program Files%\KaZaA\My Shared Folder
  • %Windows%\Temp\Support

(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.. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Adware deletes the following files:

  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop\Uninstall KaZaA Media Desktop.pif

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\KAZAA\
LocalContent

HKEY_LOCAL_MACHINE\Software\KAZAA\
CloudLoad

HKEY_CURRENT_USER\Software\Kazaa\
Settings

HKEY_CURRENT_USER\Software\Kazaa\
ResultsFilter

HKEY_CURRENT_USER\Software\Kazaa\
Transfer

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1

HKEY_LOCAL_MACHINE\Software\Cydoor

HKEY_CURRENT_USER\Software\Kazaa\
KaZaA Media Desktop

HKEY_CURRENT_USER\Software\Kazaa\
KaZaA Media Desktop\Recent File List

HKEY_CURRENT_USER\Software\Kazaa\
KaZaA Media Desktop\Settings

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
KAZAA\LocalContent
DatabaseDir = "%Program Files%\KaZaA\Db"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
KAZAA\LocalContent
DownloadDir = "%Program Files%\KaZaA\My Shared Folder"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
KAZAA\CloudLoad
ExeDir = "%Program Files%\KaZaA"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
KAZAA\CloudLoad
ShareDir = "%Program Files%\KaZaA\My Shared Folder"

HKEY_CURRENT_USER\Software\Kazaa\
Settings
UseCount = "0"

HKEY_CURRENT_USER\Software\Kazaa\
Settings
Date = "06-25-2019"

HKEY_CURRENT_USER\Software\Kazaa\
ResultsFilter
adult_filter_level = "1"

HKEY_CURRENT_USER\Software\Kazaa\
ResultsFilter
firewall_filter = "1"

HKEY_CURRENT_USER\Software\Kazaa\
Transfer
NoUploadLimitWhenIdle = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
Inno Setup: Setup Version = "2.0.18 with ISX 2.0.18"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
Inno Setup: App Path = "%Program Files%\KaZaA"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
Inno Setup: Icon Group = "KaZaA Media Desktop"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
Inno Setup: User = "{username}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
DisplayName = "KaZaA Media Desktop"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
UninstallString = "%Program Files%\KaZaA\unins000.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
DisplayVersion = "1.7.1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
Publisher = "Sharman Networks Ltd"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
URLInfoAbout = "http://www.{BLOCKED}a.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
HelpLink = "http://www.{BLOCKED}a.com/{BLOCKED}a/en/help"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\KaZaA Media Desktop_is1
URLUpdateInfo = "http://www.{BLOCKED}a.com"

Dropping Routine

This Adware drops the following files:

  • %Windows%\Temp\Support\SetRegAcl.dll
  • %User Temp%\_ad702.dll
  • %Program Files%\KaZaA\unins000.exe
  • %Windows%\Temp\Support\is-KG9US.tmp
  • %User Temp%\V9a00364\cduninst.exe
  • %User Temp%\V9a00364\cd_htm.dll
  • %Program Files%\KaZaA\CloudLoad.dat
  • %User Temp%\V9a00364\start.cdi
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop\Uninstall KaZaA Media Desktop.lnk
  • %Program Files%\KaZaA\Db\is-5CQV0.tmp
  • %User Temp%\V9a00364\adverck\cd_clint.dll
  • %User Temp%\V9a00364\adverck\cd_htm.dll
  • %User Temp%\V9a00364\adverck\cduninst.exe
  • %User Temp%\is-FLSHI.tmp\_shfoldr.dll
  • %Windows%\Temp\Adware\is-4E3QS.tmp
  • %User Temp%\V9a00364\_ad702.rtp
  • %Program Files%\KaZaA\Kazaa.exe
  • %User Temp%\is-FLSHI.tmp\SetRegAcl.dll
  • %User Temp%\V9a00364\_ad702.adx
  • %Program Files%\KaZaA\is-1M88J.tmp
  • %Program Files%\KaZaA\is-7AGK3.tmp
  • %User Temp%\V9a00364\cd_clint.dll
  • %User Temp%\V9a00364\adverck\RUNDLL32.EXE
  • %Program Files%\KaZaA\is-CBI5H.tmp
  • %User Temp%\V9a00364\adverck\start.cdi
  • %User Temp%\V9a00364\RUNDLL32.EXE
  • %Windows%\Temp\Adware\cd_install_291.exe
  • %Program Files%\KaZaA\unins000.dat
  • %Program Files%\KaZaA\Db\tsi.db

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData 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 Adware.Win32.CYDOOR.AB

[ 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\Software\KAZAA
    • LocalContent
  • In HKEY_LOCAL_MACHINE\Software\KAZAA
    • CloudLoad
  • In HKEY_CURRENT_USER\Software\Kazaa
    • Settings
  • In HKEY_CURRENT_USER\Software\Kazaa
    • ResultsFilter
  • In HKEY_CURRENT_USER\Software\Kazaa
    • Transfer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall
    • KaZaA Media Desktop_is1
  • In HKEY_LOCAL_MACHINE\Software
    • Cydoor
  • In HKEY_CURRENT_USER\Software\Kazaa
    • KaZaA Media Desktop
  • In HKEY_CURRENT_USER\Software\Kazaa\KaZaA Media Desktop
    • Recent File List
  • In HKEY_CURRENT_USER\Software\Kazaa\KaZaA Media Desktop
    • Settings

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\Wow6432Node\KAZAA\LocalContent
    • DatabaseDir = "%Program Files%\KaZaA\Db"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KAZAA\LocalContent
    • DownloadDir = "%Program Files%\KaZaA\My Shared Folder"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KAZAA\CloudLoad
    • ExeDir = "%Program Files%\KaZaA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KAZAA\CloudLoad
    • ShareDir = "%Program Files%\KaZaA\My Shared Folder"
  • In HKEY_CURRENT_USER\Software\Kazaa\Settings
    • UseCount = "0"
  • In HKEY_CURRENT_USER\Software\Kazaa\Settings
    • Date = "06-25-2019"
  • In HKEY_CURRENT_USER\Software\Kazaa\ResultsFilter
    • adult_filter_level = "1"
  • In HKEY_CURRENT_USER\Software\Kazaa\ResultsFilter
    • firewall_filter = "1"
  • In HKEY_CURRENT_USER\Software\Kazaa\Transfer
    • NoUploadLimitWhenIdle = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • Inno Setup: Setup Version = "2.0.18 with ISX 2.0.18"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • Inno Setup: App Path = "%Program Files%\KaZaA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • Inno Setup: Icon Group = "KaZaA Media Desktop"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • Inno Setup: User = "{username}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • DisplayName = "KaZaA Media Desktop"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • UninstallString = "%Program Files%\KaZaA\unins000.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • DisplayVersion = "1.7.1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • Publisher = "Sharman Networks Ltd"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • URLInfoAbout = "http://www.{BLOCKED}a.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • HelpLink = "http://www.{BLOCKED}a.com/{BLOCKED}a/en/help"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\KaZaA Media Desktop_is1
    • URLUpdateInfo = "http://www.{BLOCKED}a.com"

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.
  • %Windows%\Temp\Support\SetRegAcl.dll
  • %User Temp%\_ad702.dll
  • %Program Files%\KaZaA\unins000.exe
  • %Windows%\Temp\Support\is-KG9US.tmp
  • %User Temp%\V9a00364\cduninst.exe
  • %User Temp%\V9a00364\cd_htm.dll
  • %Program Files%\KaZaA\CloudLoad.dat
  • %User Temp%\V9a00364\start.cdi
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop\Uninstall KaZaA Media Desktop.lnk
  • %Program Files%\KaZaA\Db\is-5CQV0.tmp
  • %User Temp%\V9a00364\adverck\cd_clint.dll
  • %User Temp%\V9a00364\adverck\cd_htm.dll
  • %User Temp%\V9a00364\adverck\cduninst.exe
  • %User Temp%\is-FLSHI.tmp\_shfoldr.dll
  • %Windows%\Temp\Adware\is-4E3QS.tmp
  • %User Temp%\V9a00364\_ad702.rtp
  • %Program Files%\KaZaA\Kazaa.exe
  • %User Temp%\is-FLSHI.tmp\SetRegAcl.dll
  • %User Temp%\V9a00364\_ad702.adx
  • %Program Files%\KaZaA\is-1M88J.tmp
  • %Program Files%\KaZaA\is-7AGK3.tmp
  • %User Temp%\V9a00364\cd_clint.dll
  • %User Temp%\V9a00364\adverck\RUNDLL32.EXE
  • %Program Files%\KaZaA\is-CBI5H.tmp
  • %User Temp%\V9a00364\adverck\start.cdi
  • %User Temp%\V9a00364\RUNDLL32.EXE
  • %Windows%\Temp\Adware\cd_install_291.exe
  • %Program Files%\KaZaA\unins000.dat
  • %Program Files%\KaZaA\Db\tsi.db

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%\V9a00364\adverck
  • %Windows%\Temp\Adware
  • %User Temp%\V9a00364
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop
  • %Program Files%\KaZaA
  • %Program Files%\KaZaA\My Shared Folder\Certified
  • %Program Files%\KaZaA\Db
  • %Program Files%\KaZaA\My Shared Folder
  • %Windows%\Temp\Support

Step 7

Scan your computer with your Trend Micro product to delete files detected as Adware.Win32.CYDOOR.AB. 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.

  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\KaZaA Media Desktop\Uninstall KaZaA Media Desktop.pif


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