Trojan.Win64.DEEFFACE.A
UDS:Trojan.Win64.Overcrypt (Kaspersky)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
Arrival Details
This Trojan 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 Trojan drops the following files:
- %AppDataLocal%\Programs\3CXDesktopApp\app\d3dcompiler_47.dll –> detected as Trojan.Win64.DEEFFACE.A
- %AppDataLocal%\Programs\3CXDesktopApp\app\ffmpeg.dll –> detected as Trojan.Win64.DEEFFACE.A
(Note: %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).)
It drops the following non-malicious files:
- %AppDataLocal%\Programs\3CXDesktopApp\3CXDesktopApp.exe -> Normal file being abused to load the the trojanized DLL
- %AppDataLocal%\Programs\3CXDesktopApp\Update.exe
- %AppDataLocal%\Programs\3CXDesktopApp\.installInfo.json
- %AppDataLocal%\Programs\3CXDesktopApp\3CXDesktopApp.VisualElementsManifest.xml
- %AppDataLocal%\Programs\3CXDesktopApp\app\3CXDesktopApp.VisualElementsManifest.xml
- %AppDataLocal%\Programs\3CXDesktopApp\app\3CXDesktopApp.exe
- %AppDataLocal%\Programs\3CXDesktopApp\app\LICENSE
- %AppDataLocal%\Programs\3CXDesktopApp\app\LICENSES.chromium.html
- %AppDataLocal%\Programs\3CXDesktopApp\app\Update.exe
- %AppDataLocal%\Programs\3CXDesktopApp\app\libEGL.dll
- %AppDataLocal%\Programs\3CXDesktopApp\app\libGLESv2.dll
- %AppDataLocal%\Programs\3CXDesktopApp\app\resources\app.asar.unpacked\dist\main\notifications_bindings.node
- %AppDataLocal%\Programs\3CXDesktopApp\app\resources\app.asar.unpacked\dist\main\robotjs.node
- %AppDataLocal%\Programs\3CXDesktopApp\app\version
- %AppDataLocal%\Programs\3CXDesktopApp\app\vk_swiftshader.dll
- %AppDataLocal%\Programs\3CXDesktopApp\app\vk_swiftshader_icd.json
- %AppDataLocal%\Programs\3CXDesktopApp\app\vulkan-1.dll
- %AppDataLocal%\Programs\3CXDesktopApp\app\manifest
(Note: %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).)
Download Routine
This Trojan connects to the following URL(s) to download its component file(s):
- http://{BLOCKED}ubusercontent.com/IconStorages/images/main/icon13.ico -> it retrieves C2 domains from this URL which it will try to connect to, to download other possible payloads
As of this writing, the said sites are inaccessible.
Other Details
This Trojan requires the following additional components to properly run:
- %AppDataLocal%\Programs\3CXDesktopApp\app\ffmpeg.dll –> detected as Trojan.Win64.DEEFFACE.A
- %AppDataLocal%\Programs\3CXDesktopApp\app\d3dcompiler_47.dll –> detected as Trojan.Win64.DEEFFACE.A
(Note: %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).)
It does the following:
- It sleeps before proceeding with its intended routines.
- If the manifest file is present, it will sleep until the specified date
- If not, it will the generate a date and sleep till the generated date
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
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
Identify and terminate files detected as Trojan.Win64.DEEFFACE.A
- 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 4
Search and delete this file
- %AppDataLocal%\Programs\3CXDesktopApp\app\d3dcompiler_47.dll
- %AppDataLocal%\Programs\3CXDesktopApp\app\ffmpeg.dll
Step 5
Remove Trojan.Win64.DEEFFACE.A by using its own Uninstall option
Step 6
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.DEEFFACE.A. 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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