BKDR_PLUGX.TUFB
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
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.
TECHNICAL DETAILS
2,308,608 bytes
EXE
No
19 Nov 2014
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 creates the following folders:
- %All Users Profile%\DRM\xs
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto\Recent File List
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto\Settings
HKEY_CURRENT_USER\SOFTWARE\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto\WorkSpace
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto\WorkSpace\ControlBars-Summary
It adds the following registry entries:
HKEY_CURRENT_USER\Software\¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó\
mizumoto\WorkSpace
ApplicationLook = "d2"
Dropping Routine
This backdoor drops the following files:
- %All Users Profile%\DRM\xs\{random characters}
- %User Temp%\AFX{random}.tmp
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.. %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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}cojp.org/{random values}
SOLUTION
9.700
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
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
- ¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó
- ¥¢¥×¥ê¥±©`¥·¥ç¥ó ¥¦¥£¥¶©`¥É¤ÇÉú³É¤µ¤ì¤¿¥í©`¥«¥ë ¥¢¥×¥ê¥±©`¥·¥ç¥ó
Step 4
Search and delete these components
- %User Temp%\AFX{random}.tmp
Step 5
Search and delete these folders
- %All Users Profile%\DRM\xs
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_PLUGX.TUFB. 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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