BKDR_OPTIXPRO.H
Backdoor:Win32/Optixpro.K (Microsoft); BackDoor-RS (McAfee); Backdoor.Optix (Symantec); Trojan-Downloader.Win32.Agent.te, Backdoor.Win32.Optix.b, Backdoor.Win32.Optix.Pro.m, Backdoor.Win32 (Kaspersky); Backdoor.Optix.Pro.1.3.Dam.2 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
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 copies of itself into the affected system:
- %System%\msiexec16.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
GLSetIT32 = "%System%\msiexec16.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
GLSetIT32 = "%System%\msiexec16.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
HKEY_CURRENT_USER\Software\Microsoft\
RAS Autodial\Control
HKEY_LOCAL_MACHINE\Software\Microsoft\
RAS Autodial\Control
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Hardware Profiles\0001\Software\
Microsoft\windows\CurrentVersion\
Internet Settings
EnableAutodial = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings
EnableAutodial = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
EnableAutodial = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
RAS Autodial\Control
LoginSessionDisable = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
RAS Autodial\Control
DisableConnectionQuery = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RAS AutoDial\Control
LoginSessionDisable = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RAS AutoDial\Control
DisableConnectionQuery = "{random values}"
Other Details
This backdoor connects to the following possibly malicious URL:
- https://nexus.{BLOCKED}rt.com/rdr/pprdr.asp
- https://login.{BLOCKED}e.com/login2.srf
This report is generated via an automated analysis system.
SOLUTION
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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
- RunServices
- In HKEY_CURRENT_USER\Software\Microsoft\RAS Autodial
- Control
- In HKEY_LOCAL_MACHINE\Software\Microsoft\RAS Autodial
- Control
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
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\Windows\CurrentVersion\Run
- GLSetIT32 = "%System%\msiexec16.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
- GLSetIT32 = "%System%\msiexec16.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings
- EnableAutodial = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
- EnableAutodial = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- EnableAutodial = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\RAS Autodial\Control
- LoginSessionDisable = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\RAS Autodial\Control
- DisableConnectionQuery = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS AutoDial\Control
- LoginSessionDisable = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS AutoDial\Control
- DisableConnectionQuery = "{random values}"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_OPTIXPRO.H. 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.
Did this description help? Tell us how we did.