Backdoor.Win32.ANDROM.WLDC
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Backdoor 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
Arrival Details
This Backdoor 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 Backdoor adds the following processes:
- "%User Temp%\._cache_{malware file name}.exe"
- %User Temp%\._cache_{malware file name}.exe
- "%All Users Profile%\Synaptics\Synaptics.exe" InjUpdate
- %All Users Profile%\Synaptics\Synaptics.exe InjUpdate
(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).. %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 creates the following folders:
- %All Users Profile%\Synaptics
- %Application Data%\WinSl
- %All Users Profile%\Synaptics\WS
(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). . %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).)
Other System Modifications
This Backdoor modifies the following file(s):
- %All Users Profile%\Synaptics\RCXC58F.tmp
(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 entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
Synaptics Pointing Device Driver = "%All Users Profile%\Synaptics\Synaptics.exe"
Dropping Routine
This Backdoor drops the following files:
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_winax_debug.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\uninstall_flashplayer18_0r0_203_win.exe
- %User Temp%\ouhnZClU.ico
- %All Users Profile%\Synaptics\Synaptics.exe
- %User Temp%\fhT9nJMJ.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_200_winpep.exe
- %User Temp%\SqxTqRHr.ico
- %AppDataLocal%\GDIPFONTCACHEV1.DAT
- %User Temp%\Comv9545.exe
- %User Temp%\SqxTqRHr.exe
- %User Temp%\fhT9nJMJ.ico
- %User Temp%\Q8A4G7iq.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_winax.exe
- %User Temp%\zYyYBJdW.ico
- %User Temp%\Xa4BRgdB.exe
- %User Temp%\._cache_{malware file name}.exe
- %User Temp%\Xa4BRgdB.ico
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_debug.exe
- %User Temp%\PXfmSuds.ico
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer118_0r0_200_winpep_debug.exe
- %User Profile%\Documents\uninstall_flash_player.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_sa_debug.exe
- %User Temp%\ouhnZClU.exe
- %Application Data%\WinSl\L1\2\2020
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_win.exe
- %User Temp%\Comv9545.ico
- %User Temp%\zg4sRHS.ini
- %User Temp%\zYyYBJdW.exe
- %All Users Profile%\Synaptics\RCXC58F.tmp
- %User Temp%\CsnsETLT.exe
- %User Temp%\Q8A4G7iq.ico
- %User Temp%\CsnsETLT.ico
- %User Temp%\PXfmSuds.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} 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).. %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). . %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local 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
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 Backdoor.Win32.ANDROM.WLDC
- 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.
- 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.
- 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
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\Microsoft\Windows\CurrentVersion\Run
- Synaptics Pointing Device Driver = "%All Users Profile%\Synaptics\Synaptics.exe"
Step 4
Search and delete these components
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_winax_debug.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\uninstall_flashplayer18_0r0_203_win.exe
- %User Temp%\ouhnZClU.ico
- %All Users Profile%\Synaptics\Synaptics.exe
- %User Temp%\fhT9nJMJ.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_200_winpep.exe
- %User Temp%\SqxTqRHr.ico
- %AppDataLocal%\GDIPFONTCACHEV1.DAT
- %User Temp%\Comv9545.exe
- %User Temp%\SqxTqRHr.exe
- %User Temp%\fhT9nJMJ.ico
- %User Temp%\Q8A4G7iq.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_winax.exe
- %User Temp%\zYyYBJdW.ico
- %User Temp%\Xa4BRgdB.exe
- %User Temp%\._cache_{malware file name}.exe
- %User Temp%\Xa4BRgdB.ico
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_debug.exe
- %User Temp%\PXfmSuds.ico
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer118_0r0_200_winpep_debug.exe
- %User Profile%\Documents\uninstall_flash_player.exe
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203_debug\flashplayer18_0r0_203_win_sa_debug.exe
- %User Temp%\ouhnZClU.exe
- %Application Data%\WinSl\L1\2\2020
- %User Profile%\Documents\fp_18.0.0.203_archive\18_0_r0_203\flashplayer18_0r0_203_win.exe
- %User Temp%\Comv9545.ico
- %User Temp%\zg4sRHS.ini
- %User Temp%\zYyYBJdW.exe
- %All Users Profile%\Synaptics\RCXC58F.tmp
- %User Temp%\CsnsETLT.exe
- %User Temp%\Q8A4G7iq.ico
- %User Temp%\CsnsETLT.ico
- %User Temp%\PXfmSuds.exe
Step 5
Search and delete these folders
- %All Users Profile%\Synaptics
- %Application Data%\WinSl
- %All Users Profile%\Synaptics\WS
Step 6
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.ANDROM.WLDC. 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 7
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.
- %All Users Profile%\Synaptics\RCXC58F.tmp
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