BKDR_NEUREVT.DGL
Trojan:Win32/Neurevt.C (Microsoft); PWSZbot-FAEC!7BFF84D11A60 (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Yakes.gmfu (Kaspersky); Mal/Wonton-J (Sophos); LooksLike.Win32.Crowti.a (v) (Sunbelt); Trojan horse Inject2.AYJZ (AVG)
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.
It modifies the Internet Explorer Zone Settings.
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:
- %ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe
(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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 creates the following folders:
- %ProgramData%\Common Files\USB Adapter Updater
(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rstrui.exe
Debugger = "{random name 2}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{random name 1}.exe
DisableExceptionChainValidation = ""
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSDPSRV
Start = "2"
(Note: The default value data of the said registry entry is 3.)
Web Browser Home Page and Search Page Modification
This backdoor modifies the Internet Explorer Zone Settings.
Dropping Routine
This backdoor drops the following files:
- %ProgramData%\Common Files\USB Adapter Updater\desktop.ini
(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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:
- {BLOCKED}acka.com
- {BLOCKED}and.com
- {BLOCKED}bast.com
- {BLOCKED}rda.com
- {BLOCKED}utlol.com
- {BLOCKED}onsi.com
- {BLOCKED}mesa.com
- {BLOCKED}onsor.com
- {BLOCKED}ngsong.com
- {BLOCKED}bastion.com
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
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- USB Adapter Updater = "%ProgramData%\Common Files\USB Adapter Updater\{random name 1}.exe"
- In HKEY_CURRENT_USER\Software\Win7zip
- Uuid = "{random values}"
- Uuid = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rstrui.exe
- Debugger = "{random name 2}.exe"
- Debugger = "{random name 2}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{random name 1}.exe
- DisableExceptionChainValidation = ""
- DisableExceptionChainValidation = ""
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled"
- %Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled"
Step 5
Restore this modified 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\SYSTEM\CurrentControlSet\Services\SSDPSRV
- From: Start = "2"
To: Start = 3
- From: Start = "2"
Step 6
Search and delete this folder
- %ProgramData%\Common Files\USB Adapter Updater
Step 7
Reset Internet security settings
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.DGL. 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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