BKDR_NETWIREDRC.CH
Trojan.Win32.VBKrypt.zbnp (Kaspersky); Spyware.LokiBot (Malwarebytes); VirTool:Win32/VBInject (Microsoft)
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.
It creates folders where it drops its files.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
479,232 bytes
EXE
Yes
16 Feb 2018
Drops files, Downloads files, Steals information, Connects to URLs/IPs, Compromises system security
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 copies of itself into the affected system and executes them:
- %User Temp%\subfolder\adobe.exe -> modified copy
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following files:
- %User Temp%\subfolder\.Identifier
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops and executes the following files:
- %User Temp%\subfolder\adobe.vbs -> used to add registry and run dropped copy
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- pjtcCJSh
It injects codes into the following process(es):
- %User Temp%\subfolder\adobe.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This Backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Acrobat = "%User Temp%\subfolder\adobe.vbs"
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Download & execute files on the affected system
- Execute Shell Commands
- Perform keylogging routine
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}ions14718.{BLOCKED}s.net:3324
Dropping Routine
This Backdoor drops the following file(s), which it uses for its keylogging routine:
- %Application Data%\Logs\{DD-MM-YYYY}
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Information Theft
This Backdoor attempts to steal stored email credentials from the following:
- Microsoft Outlook
It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:
- Mozilla Firefox
- Mozilla Thunderbird
- Mozilla SeaMonkey
- Internet Explorer
SOLUTION
9.850
14.104.07
02 Mar 2018
14.105.00
03 Mar 2018
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- Acrobat = "%User Temp%\subfolder\adobe.vbs"
- Acrobat = "%User Temp%\subfolder\adobe.vbs"
Step 5
Search and delete this folder
- %User Temp%\subfolder
Step 6
Search and delete this file
- %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 BKDR_NETWIREDRC.CH. 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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