TROJ_OPIEX.A
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
This Trojan 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 file infection routine.
It does not have any backdoor routine.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats. As of this writing, the said sites are inaccessible.
It terminates itself if it detects it is being run in a virtual environment. It gathers information and reports it to its servers.
TECHNICAL DETAILS
67,072 bytes
EXE
Yes
22 Mar 2016
Connects to URLs/IPs, Downloads files, Steals information
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Infection Points
This Trojan does not have any file infection routine.
Installation
This Trojan drops the following copies of itself into the affected system:
- %All Users Profile%\explorer.exe
(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.)
It adds the following processes:
- upnpcont.exe <- if 64bit
- lsass.exe <- if 32bit
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- utchctDtd
- QPONMKJIH
It injects codes into the following process(es):
- created upnpcont.exe <- if 64bit
- self <- if failed to create lsass.exe or upnpcont.exe
- created lsass.exe <- if 32bit
It terminates itself if it finds the following processes in the affected system's memory:
- drlwszvcbeo.exe
- vboxservice.exe
- vboxtray.exe
- defenderdaemon.exe
- taskmgr.exe
- procmon.exe
- vboxservice.exe
- vmacthlp.exe
- spidernt.exe
- spiderui.exe
- dwservice.exe
- SbieDll.dll
- VBoxHook.dll
- VBoxMRXNP.dll
- snxhk.dll
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Winodws\CurrentVersion\Policies\
Explorer\Run
Google Update = "%All Users Profile%\explorer.exe" <- if admin
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%All Users Profile%\explorer.exe" <- if non-admin
It drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\{random number}.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Backdoor Routine
This Trojan does not have any backdoor routine.
Download Routine
This Trojan connects to the following malicious URLs:
- http://{BLOCKED}.{BLOCKED}.183.147/stats/notify.php?d={hashed data}
It accesses the following websites to download files:
- {depends on the reply from the C&C}
It saves the files it downloads using the following names:
- %User Temp%\{random number}.exe <- executed afterwards
- %User Temp%\{random number}.0pxm <- temporary storage, will be read and loaded onto memory, deleted afterwards
(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.)
As of this writing, the said sites are inaccessible.
Other Details
This Trojan terminates itself if it detects it is being run in a virtual environment.
It terminates itself if windows or classes contain any of the following string(s):
- capturing from
- sysinternals
- task manager
- TCPViewClass
- HTTP Analyzer
It gathers the following information and reports it to its servers:
- Computer Name
- User Name
- Host Name
- IP address
- OS Information (Version, Service Pack, Architecture)
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.800
12.432.05
28 Mar 2016
12.433.00
29 Mar 2016
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Winodws\CurrentVersion\Policies\Explorer\Run
- Google Update = "%All Users Profile%\explorer.exe"
- Google Update = "%All Users Profile%\explorer.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%All Users Profile%\explorer.exe"
- Load = "%All Users Profile%\explorer.exe"
Step 5
Search and delete this file
- %User Temp%\{random number}.exe
- %User Temp%\{random number}.0pxm
- %User Startup%\{random number}.lnk
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_OPIEX.A. 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 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_OPIEX.A. 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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