BKDR_NEUREVT.AB
Trojan:Win32/Neurevt.A(Microsoft), Trojan.Win32.Neurevt(Ikarus), Win32/Neurevt.A trojan(Eset)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
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
245,248 bytes
EXE
Yes
08 Apr 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.
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
Windows Device Installer = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Windows Device Installer = "{malware path and file name}"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{CLSID}
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CG1
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CS1
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CW1
HKEY_CURRENT_USER\Software\Win7zip
It adds the following registry entries:
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CG1
GLA = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CG1
LCT = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CG1
LSF = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CG1
CF03 = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CS1
SO3 = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID}\
1BE003AB\CW1
1480 = "{hex value}"
HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{hex value}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
2500 = "3"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\2
2500 = "3"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2500 = "3"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\4
2500 = "3"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
TaskbarNoNotification = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{application}
Debugger = "{random characters}.exe"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
Other Details
This backdoor connects to the following possibly malicious URL:
- www.{BLOCKED}t.com/000003/order.php
SOLUTION
9.700
10.714.03
08 Apr 2014
10.715.00
09 Apr 2014
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_CLASSES_ROOT\CLSID
- {CLSID}
- {CLSID}
- In HKEY_CURRENT_USER\Software
- Win7zip
- Win7zip
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
- Windows Device Installer = "{malware path and file name}"
- Windows Device Installer = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Windows Device Installer = "{malware path and file name}"
- Windows Device Installer = "{malware path and file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
- 2500 = "3"
- 2500 = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
- 2500 = "3"
- 2500 = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- 2500 = "3"
- 2500 = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
- 2500 = "3"
- 2500 = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- TaskbarNoNotification = "1"
- TaskbarNoNotification = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{application}
- Debugger = "{random characters}.exe"
- Debugger = "{random characters}.exe"
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = "0"
To: ShowSuperHidden = 1
- From: ShowSuperHidden = "0"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.AB. 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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