BKDR_NEUREVT.GO
Trojan:Win32/Neurevt.A (Microsoft), Win32/Neurevt.A trojan (NOD32), TR/Neurevt.A.65 (Antivir)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 executes commands from a remote malicious user, effectively compromising the affected system.
It modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.
TECHNICAL DETAILS
236,032 bytes
EXE
Yes
09 May 2013
Compromises system security, Connects to URLs/IPs, Steals information
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 creates the following folders:
- %Application Data%\Microsoft\Crypto
- %Application Data%\Microsoft\Crypto\RSA
- %Application Data%\Microsoft\Crypto\RSA\{Random}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It injects codes into the following process(es):
- wuauclt.exe
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
ActiveUpdate = "{malware path}\{malware filename}"
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer
TaskbarNoNotification = "1"
HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rstrui.exe
Debugger = "{random}_.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
hijackthis.exe
Debugger = "{random}_.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
spybotsd.exe
Debugger = "{random}_.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
housecalllauncher.exe
Debugger = "{random}_.exe"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download files
- Upload files
- Copy itself in removable drives
- Start or stop programs
- Delete files
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}.{BLOCKED}.215.3:80
- http://{BLOCKED}.{BLOCKED}.32.177:80
Web Browser Home Page and Search Page Modification
This backdoor modifies Internet Explorer zone settings.
Information Theft
This backdoor attempts to steal stored account information used in the following installed File Transfer Protocol (FTP) clients or file manager software:
- CoreFTP
- FileZilla
- FlashFXP
- FTP Commander
- PuTTy
- SmartFTP
Stolen Information
This backdoor sends the gathered information via HTTP POST to the following URL:
- http://{BLOCKED}cio.com/wordpress/order.php
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
- update.microsoft.com
- microsoft.com
- windowsupdate.microsoft.com
- google.com
NOTES:
It queries the following registry key to get the processor information:
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor
It queries the following registry key to get Microsoft Net Framework Version:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Net Framework setup\NDP
It scans the system for the following Antivirus and Security Related processes then terminates them:
- APVXDWIN
- ArcaBit
- avast! Antivirus
- Avira
- AVP
- Bdagent
- BullGuard
- emisoft anti-malware
- ESET
- fshoster
- G Data Antivirus Tray Application
- IStray
- MSC
- RsMgrSvc
- Symantec
- Trend Micro Titanium
- WRSVC
- ZoneAlarm
SOLUTION
9.300
10.200.04
06 Aug 2013
10.201.00
07 Aug 2013
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 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\Win7zip
- Uuid = "{random values}"
- Uuid = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
- ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rstrui.exe
- Debugger = "{random}_.exe"
- Debugger = "{random}_.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\hijackthis.exe
- Debugger = "{random}_.exe"
- Debugger = "{random}_.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\spybotsd.exe
- Debugger = "{random}_.exe"
- Debugger = "{random}_.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\housecalllauncher.exe
- Debugger = "{random}_.exe"
- Debugger = "{random}_.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
- TaskbarNoNotification = "1"
- TaskbarNoNotification = "1"
Step 4
Search and delete these folders
- %Application Data%\Microsoft\Crypto
Step 5
Reset Internet security settings
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.GO . 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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