TROJ_OPIEX.A

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.

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.