Backdoor.Win64.SHADOWPAD.AE
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
298,496 bytes
DLL
Yes
18 Mar 2020
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:
- %Windows%\temp\TrendUpdate.exe
- %System%\svchost.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It creates the following folders:
- %All Users Profile%\Gateway
- %System Root%\Users\All Users\Gateway
(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). . %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Autostart Technique
This Backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ALGS
ImagePath = "%All Users Profile%\Gateway\Algs.exe"
It adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
LayerGatewayService = "%All Users Profile%\Gateway\Algs.exe"
Other System Modifications
This Backdoor deletes the following files:
- %Windows%\Temp\secur32.img
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\INB
INB = "\xf7\xcb\x91O\xc9\x86C\xe3\x07\x0b\x00\x01\x00\x12\x00\x12\x00\x03\x001\x00?\x01"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ALGS
DisplayName = "Application Layer Gateway Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ALGS
Start = "SERVICE_AUTO_START"
Dropping Routine
This Backdoor drops the following files:
- %All Users Profile%\Gateway\secur32.dll
- %Windows%\Logs\DPX\setpend.txt
- %Windows%\Temp\secur32.dll
- %All Users Profile%\Gateway\Algs.exe
- %Windows%\Temp\TrendUpdate.exe
- %System Root%\Users\All Users\Gateway\Algs.exe
- %System Root%\Users\All Users\Gateway\secur32.dll
(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). . %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
This report is generated via an automated analysis system.
SOLUTION
9.850
15.752.06
19 Mar 2020
15.753.00
20 Mar 2020
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- Troj.Win32.TRX.XXPE50FFF034
Step 2
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 3
Restart in Safe Mode
Step 4
Identify and terminate files detected as Backdoor.Win64.SHADOWPAD.AE
- 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 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\Run
- LayerGatewayService = %All Users Profile%\Gateway\Algs.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\INB
- INB = \xf7\xcb\x91O\xc9\x86C\xe3\x07\x0b\x00\x01\x00\x12\x00\x12\x00\x03\x001\x00?\x01
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ALGS
- DisplayName = Application Layer Gateway Service
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ALGS
- Start = SERVICE_AUTO_START
Step 6
Search and delete these components
- %All Users Profile%\Gateway\secur32.dll
- %Windows%\Logs\DPX\setpend.txt
- %Windows%\Temp\secur32.dll
- %All Users Profile%\Gateway\Algs.exe
- %Windows%\Temp\TrendUpdate.exe
- %System Root%\Users\All Users\Gateway\Algs.exe
- %System Root%\Users\All Users\Gateway\secur32.dll
Step 7
Search and delete this folder
- %All Users Profile%\Gateway
- %System Root%\Users\All Users\Gateway
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win64.SHADOWPAD.AE. 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
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.
- %Windows%\Temp\secur32.img
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