Backdoor.Win32.SHADOWPAD.RJM
Win32:Evo-gen [Trj] (AVAST)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
6,541,312 bytes
DLL
No
25 May 2023
Connects to URLs/IPs, Modifies system registry
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 drops and executes the following files:
- %All Users Profile%\MicroSoft.NET\AppLaunch.exe - If it isn't run on MicroSoft.NET Folder
- %All Users Profile%\MicroSoft.NET\mscoree.dll - If it isn't run on MicroSoft.NET Folder
(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 processes:
- %System%\svchost.exe
(Note: %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%\MicroSoft.NET\
(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 mutexes to ensure that only one of its copies runs at any one time:
- Global\VDJPXBLDHTBZBXLVP
It injects codes into the following process(es):
- %System%\svchost.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Other System Modifications
This Backdoor adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\KZF
KZF = {Hex values}
Backdoor Routine
This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:
- TCP://{BLOCKED}c.{BLOCKED}1.info:{80, 443, 8080}
However, as of this writing, the said sites are inaccessible.
Other Details
This Backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DDJJPBXTNXNR
It requires the existence of the following files to properly run:
- AppLaunch.exe
It does the following:
- It requires to be loaded by %All Users Profile%\MicroSoft.NET\AppLaunch.exe to perform its malicious routine
(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). )
SOLUTION
9.800
18.490.04
05 Jun 2023
18.491.00
06 Jun 2023
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.XXPE50FFF068
Step 2
Search and delete these folders
- %All Users Profile%\MicroSoft.NET\
Step 3
Search and delete this file
- %All Users Profile%\MicroSoft.NET\AppLaunch.exe
- %All Users Profile%\MicroSoft.NET\mscoree.dll
Step 4
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\KZF
- KZF = {Hex values}
- KZF = {Hex values}
Step 5
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_LOCAL_MACHINE\SOFTWARE\KZF
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DDJJPBXTNXNR
Step 6
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.SHADOWPAD.RJM. 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:
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