BKDR_PLUGX.BA
Backdoor:Win32/Plugx (Microsoft), Backdoor.Korplug (Symantec), Backdoor.Win32.Gulpix.vir (Kaspersky), Win32/Korplug.GZ (ESET), W32/Gulpix.VIR!tr.bdr (Fortinet), Backdoor.Win32.Gulpix (Ikarus)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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 executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
Varies
EXE
Yes
19 Aug 2015
Compromises system security, Terminates processes
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:
- %User Temp%\nvdisps.dll
- %User Temp%\nvdisps_user.dat
(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:
- Fast
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CLASSES_ROOT\FAST
It adds the following registry entries:
HKEY_CLASSES_ROOT\FAST
CLSID = "{random hex values}"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Get drive information
- Enumerate files
- Create directories
- Get file information
- Read from a file
- Write to a file
- Copy, move, rename, delete files
- Execute files
- Lock workstation
- Log off user
- Restart/Shutdown system
- Display a message box
- Perfrom port mapping
- Enumerate processes
- Enumerate process modules
- Terminate processes
- Enumerate services
- Get service information
- Modify services
- Start services
- Delete services
- Perform remote shell
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}.{BLOCKED}.81.131:443/update?id={id}
- http://{BLOCKED}.{BLOCKED}.28.6:443/update?id={id}
- http://app.{BLOCKED}ldfun.com:443/update?id={id}
SOLUTION
9.750
11.864.07
20 Aug 2015
11.865.00
20 Aug 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
Restart in Safe Mode
Step 3
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_CLASSES_ROOT
- FAST
- FAST
Step 4
Search and delete these files
- %User Temp%\nvdisps.dll
- %User Temp%\nvdisps_user.dat
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PLUGX.BA. 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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