Backdoor.Win32.NETWIRED.FAS
HEUR/AGEN.1045830(ANTIVIR)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
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.
It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.
It steals certain information from the system and/or the user.
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:
- {Malware File Path}\{Malware Filename}.exe
It creates the following folders:
- %Application Data%\Logs
(Note: %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).)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- FtsqDvKF
Other System Modifications
This Backdoor adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{Special Characters}
StubPath = {Malware File Path}\{Malware Filename}.exe
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- List files on a directory
- Terminate processes
- Perform keylogging routine
- List Drives Information
- Get Logon Sessions
- List Process information
- Take Screenshots
- Search for specific files
- List processes' listening ports
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.167.122:4300
However, as of this writing, the said sites are inaccessible.
Dropping Routine
This Backdoor drops the following files:
- %User Temp%\{Random Characters}.bat -> for self-deletion
(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).)
It drops the following file(s), which it uses for its keylogging routine:
- %Application Data%\Logs\{DD-MM-YYYY}
(Note: %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).)
Information Theft
This Backdoor steals the following information:
- Credentials in the following protocol:
- POP3
- IMAP
- HTTP
- SMTP
- EAS
- System Information:
- Computer Name
- OS Version
- Product Version
It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:
- Mozilla Thunderbird
- Mozilla SeaMonkey
It attempts to steal stored email credentials from the following:
- Microsoft Outlook
Other Details
This Backdoor does the following:
- It connects to the following URL to download updates of itself and inject it to the currently running process of the malware:
- https://drive.google.com/uc?export=download&id={BLOCKED}GNrQI464NxzXe
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
Restart in Safe Mode
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\Microsoft\Active Setup\Installed Components\{Special Characters}
- StubPath = {Malware File Path}\{Malware Filename}.exe
- StubPath = {Malware File Path}\{Malware Filename}.exe
Step 5
Search and delete these folders
- %Application Data%\Logs
Step 6
Search and delete this file
- %User Temp%\{Random Characters}.bat
- %Application Data%\Logs\{DD-MM-YYYY}
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win32.NETWIRED.FAS. 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.
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