BKDR_NETWIREDRC.NZU
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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 deletes the initially executed copy of itself.
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 drops the following copies of itself into the affected system:
- %Application Data%\Adobe_ssl.exe
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
It drops the following files:
- {Malware Path}\.Identifier
It adds the following processes:
- notepad.exe
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- xqiYWgXG
It injects codes into the following process(es):
- created notepad.exe process
Autostart Technique
This Backdoor drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\Adobe_ssl.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Download & execute files on the affected system
- Execute Command Shell
- Terminate Processes
- Manage files and folders
- Perform keylogging routine
- Retrieve stored passwords from browsers / email clients
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.4.37:4488
However, as of this writing, the said sites are inaccessible.
Dropping Routine
This Backdoor drops the following file(s), which it uses for its keylogging routine:
- %Application Data%\Dobe\{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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
Information Theft
This Backdoor attempts to steal stored email credentials from the following:
- Microsoft Outlook
- Mozilla Thunderbird
It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:
- Opera
- Google Chrome
- Chromium
- Mozilla Firefox
- Mozilla SeaMonkey
- Internet Explorer
Other Details
This Backdoor deletes the initially executed copy of itself
SOLUTION
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
Search and delete this folder
- %Application Data%\Dobe
Step 5
Search and delete this file
- %User Startup%\Adobe_ssl.lnk
- {Malware Path}\.Identifier
- %Application Data%\Dobe\{DD-MM-YYYY}
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NETWIREDRC.NZU. 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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