ADW_CYDOOR.GA
Adware.Cydoor-6 (ClamAV); Adware/CyDoor (Fortinet); Adware-CyDoor (McAfee); Cydoor (PUA) (Sophos); Adware.Win32.Cydoor.aa (Baidu-International)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Adware
Destructiveness: No
Encrypted: No
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. It may be manually installed by a user.
It does not have any propagation routine.
It does not have any backdoor routine.
TECHNICAL DETAILS
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.
It may be manually installed by a user.
Installation
This adware drops the following files:
- %System%\cd_clint.dll - detected as ADWARE_CYDOOR
- %System%\cd_htm.dll - detected as ADWARE_CYDOOR
- %System%\CD_Load.exe - detected as Adware_Cydoor
- %System%\AdCache\b_149300.GIF
- %System%\AdCache\b_149301.GIF
- %System%\AdCache\b_151700.GIF
- %System%\AdCache\b_151701.GIF
- %User Temp%\_ad149.dll - detected as ADWARE_CYDOOR
- %User Temp%\{random folder name}\CD_Load.exe - detected as Adware_Cydoor
- %User Temp%\{random folder name}\cd_clint.dll - detected as ADWARE_CYDOOR
- %User Temp%\{random folder name}\cd_htm.dll - detected as ADWARE_CYDOOR
- %User Temp%\{random folder name}\ftetris.exe
- %User Temp%\{random folder name}\RUNDLL32.EXE
- %User Temp%\{random folder name}\Start.cdi
- %User Temp%\{random folder name}\_ad149.rtp
- %User Temp%\{random folder name}\_ad149.adx
- %User Temp%\{random folder name}\Privacy.gif
- %User Temp%\{random folder name}\B_149300.gif
- %User Temp%\{random folder name}\B_149301.gif
- %User Temp%\{random folder name}\adverck\B_149300.gif
- %User Temp%\{random folder name}\adverck\B_149301.gif
- %User Temp%\{random folder name}\adverck\cd_clint.dll - detected as ADWARE_CYDOOR
- %User Temp%\{random folder name}\adverck\cd_htm.dll - detected as ADWARE_CYDOOR
- %User Temp%\{random folder name}\adverck\CD_Load.exe - detected as Adware_Cydoor
- %User Temp%\{random folder name}\adverck\ftetris.exe
- %User Temp%\{random folder name}\adverck\Privacy.gif
- %User Temp%\{random folder name}\adverck\Start.cdi
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.)
It creates the following folders:
- %System%\AdCache
- %User Temp%\{random folder name}
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.)
Other System Modifications
This adware adds the following registry keys:
HKEY_CURRENT_USER\Software\Cydoor
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
HKEY_CURRENT_USER\Software\Cydoor Services
HKEY_CURRENT_USER\Software\Cydoor Services\
Status
HKEY_CURRENT_USER\Software\Cydoor Services\
Queue
HKEY_LOCAL_MACHINE\SOFTWARE\Cydoor
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AdSupport_{numbers}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Cydoor
HIS_1 = ""
HKEY_CURRENT_USER\Software\Cydoor
RHIS_1 = ""
HKEY_CURRENT_USER\Software\Cydoor
DHIS_1 = ""
HKEY_CURRENT_USER\Software\Cydoor
Vers = "{value}"
HKEY_CURRENT_USER\Software\Cydoor
Desc2 = "{data}"
HKEY_CURRENT_USER\Software\Cydoor
UserCode = "0"
HKEY_CURRENT_USER\Software\Cydoor
ShowChange = "1"
HKEY_CURRENT_USER\Software\Cydoor
Errors = "{value}"
HKEY_CURRENT_USER\Software\Cydoor
PrxyEnable = "{value}"
HKEY_CURRENT_USER\Software\Cydoor
PrxyUrl = "{value}"
HKEY_CURRENT_USER\Software\Cydoor
ConnType = "2"
HKEY_LOCAL_MACHINE\SOFTWARE\Cydoor
AdwrCnt = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Cydoor
%Program Files%\2VG\FTetris\tetris.exe = "{numbers}"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
ExistFile = "%PROGRAMFILES%\2VG\FTetris\tetris.exe"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
LoctNum = "1"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
DistCode = "0"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
ShowChange = "1"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}
Uninstall = ""
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}
SeqnList = "{hex values}"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}
SeqnNum = "2"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}
MinCycle = "0"
HKEY_CURRENT_USER\Software\Cydoor Services\
Status
IdleState = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AdSupport_{numbers}
UninstallString = "RunDll32 %SystemRoot%\system32\cd_clint.dll,ServiceRunDll u_{numbers}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FreeTetris_is1
Cydoor = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FreeTetris_is1
UninstallString = ="RunDll32 %SystemRoot%\system32\cd_clint.dll,ServiceRunDll u_{numbers} "FreeTetris_is1""
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
ShowBann = "1"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
PrCode = "{value}"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
ExpsNum = "1"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
ExpsCnt = "0"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
ExpsLast = "0"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
BannNum = "2"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
BannCnt = "0"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
FileTerm = "GIF"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
Url = "http://www.cydoor.com/Games"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
Url = "http://www.cydoor.com/music"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
ConfStr = "{data}"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
Type = "1"
HKEY_CURRENT_USER\Software\Cydoor\
Adwr_{numbers}\Loct_{number}\Level_{number}\
Seqn_{numbers}
CycleInter = "2"
Propagation
This adware does not have any propagation routine.
Backdoor Routine
This adware does not have any backdoor routine.
NOTES:
It connects to the following websites for displaying pop up advertisements:
- http://ww15.{BLOCKED}or.com/Games
- http://www.c{BLOCKED}or.com/Games
- http://www.c{BLOCKED}or.com/music
- http://{BLOCKED}d.ok{BLOCKED}65.com/?dm=cydoor.com&acc={value}&ref=http://ww15.cydoor.com/Games
- http://www.b{BLOCKED}s2.net/{path 1}/{path 2}?{data}
- http://www.b{BLOCKED}s1.net/{path 1}/{path 2}?{data}
- http://www.r{BLOCKED}s2.net/{path 1}/{path 2}?{data}
- http://www.r{BLOCKED}s1.net/{path 1}/{path 2}?{data}
- http://www.c{BLOCKED}s2.net/{path 1}/{path 2}?{data}
- http://www.c{BLOCKED}s1.net/{path 1}/{path 2}?{data}
{path 1} can be any of the following:
- scripts/brs/
- scripts/rgs/
- scripts/cms/
{path 2} can be any of the following:
- Cms{number}.ASP
- Rgs{number}.ASP
- RgsInit.ASP
- CmsInit.ASP
- RgsInit{number}.ASP
- CmsInit{number}.ASP
It may perform the following routines:
- Allow the program that installed it to launch it
- Display pop up advertisements
- Produce message box
- Enable or Disable proxy usage
- Check for Internet connection
- Sleep
SOLUTION
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry key
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
- Cydoor
- Cydoor
- In HKEY_CURRENT_USER\Software
- Cydoor Services
- Cydoor Services
- In HKEY_LOCAL_MACHINE\SOFTWARE
- Cydoor
- Cydoor
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- AdSupport_{numbers}
- AdSupport_{numbers}
Step 5
Delete this registry value
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\CurrentVersion\Uninstall\FreeTetris_is1
- Cydoor = "1"
- Cydoor = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\FreeTetris_is1
- UninstallString = ="RunDll32 %SystemRoot%\system32\cd_clint.dll,ServiceRunDll u_{numbers} "FreeTetris_is1""
- UninstallString = ="RunDll32 %SystemRoot%\system32\cd_clint.dll,ServiceRunDll u_{numbers} "FreeTetris_is1""
Step 6
Search and delete this file
- %System%\cd_clint.dll
- %System%\cd_htm.dll
- %System%\CD_Load.exe
- %User Temp%\_ad149.dll
Step 7
Search and delete these folders
- %System%\AdCache
- %User Temp%\{random folder name}
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as ADW_CYDOOR.GA. 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 9
Scan your computer with your Trend Micro product to delete files detected as ADW_CYDOOR.GA. 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.
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