BKDR_PLUGX.JU
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
57,344 bytes
DLL
Yes
28 Apr 2015
Drops files, Terminates processes, 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 component file(s):
- %Application Data%\{random filename}
(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.)
It adds the following processes:
- svchost.exe
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- i1j0rwAfXYM
- Global\{random}
It injects codes into the following process(es):
- created svchost.exe
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\Run
p{random number}fice = "{malware path}\windec.exe"
Other System Modifications
This backdoor deletes the following files:
- {path and filename of deleted files}.jpg ← deletes all .jpg files found
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
WaYaFlagReg002
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Copy, move, rename, delete files
- Create directories
- Create files
- Enumerate files
- Execute files
- Get drive information
- Get file information
- Open and modify files
- Log keystrokes and active window
- Enumerate TCP and UDP connections
- Enumerate network resources
- Set TCP connection state
- Lock workstation
- Log off user
- Restart/Reboot/Shutdown system
- Display a message box
- Perform port mapping
- Enumerate processes
- Get process information
- Terminate processes
- Enumerate registry keys
- Create registry keys
- Delete registry keys
- Copy registry keys
- Enumerate registry entries
- Modify registry entries
- Delete registry values
- Screen capture
- Delete services
- Enumerate services
- Get service information
- Modify services
- Start services
- Perform remote shell
- Host Telnet server
- Connect to a database server and execute SQL statement
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- https://{BLOCKED}ail.{BLOCKED}kemonn.net/{random hex values}
As of this writing, the said sites are inaccessible.
Other Details
This backdoor requires the existence of the following files to properly run:
- {malware path}\myeclipse.dat ← configuration file
- {malware path}\windec.exe ← a non-malicious file used to load mpsvc.dll (BKDR_PLUGX.JU)
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.750
11.640.08
30 Apr 2015
11.641.00
01 May 2015
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\Run
- p{random number}fice = "{malware path}\windec.exe"
- p{random number}fice = "{malware path}\windec.exe"
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_CURRENT_USER\Software\Microsoft
- WaYaFlagReg002
- WaYaFlagReg002
Step 6
Search and delete these files
- %Application Data%\{random filename}
- {malware path}\windec.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PLUGX.JU. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
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