Backdoor.Win32.FARFLI.RGZ
HEUR/AGEN.1243050(ANTIVIR), BScope.Backdoor.Farfli(VBA32)
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
3,810,816 bytes
EXE
No
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 the following files:
- %Program Files%\Edge\Microsoft\EdgeUpdat\EdgeUpdateTaskMachineUA.exe → detected as Trojan.Win32.KILLAV.WLEAT
- %Public%\Documents\pass.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)
It adds the following processes:
- "%Program Files%\Edge\Microsoft\EdgeUpdat\EdgeUpdateTaskMachineUA.exe"
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other System Modifications
This Backdoor adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Rsymwg ccyqksqc
ConnectGroup = mofa
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Rsymwg ccyqksqc
MarkTime = {Date when the file is executed}
Other Details
This Backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Rsymwg ccyqksqc
SOLUTION
9.800
17.416.03
02 Mar 2022
17.417.00
03 Mar 2022
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.XXPE50FFF053
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
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 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\SYSTEM\ControlSet001\services\Rsymwg ccyqksqc
- ConnectGroup = mofa
- ConnectGroup = mofa
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Rsymwg ccyqksqc
- MarkTime = {Date when the file is executed}
- MarkTime = {Date when the file is executed}
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\SYSTEM\ControlSet001\services\
- Rsymwg ccyqksqc
- Rsymwg ccyqksqc
Step 6
Search and delete this file
- %Program Files%\Edge\Microsoft\EdgeUpdat\EdgeUpdateTaskMachineUA.exe
- %Public%\Documents\pass.txt
Step 7
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.FARFLI.RGZ. 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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