BKDR_NEUREVT.LML
Trojan:Win32/Neurevt.AB (Microsoft), Trojan.Win32.Neurevt.dvb (Kaspersky)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 deletes the initially executed copy of itself.
TECHNICAL DETAILS
237,568 bytes
EXE
Yes
05 Jun 2015
Compromises system security, Connects to URLs/IPs
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:
- %Program Files%\Common Files\AudioDriverSFX\ftwxlmwgs.exe
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
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
Windows Update Service = "%Program Files%\Common Files\AudioDriverSFX\ftwxlmwgs.exe"
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer
TaskbarNoNotification = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
BavUpdater.exe
Debugger = "{ransom string}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
adaware.exe
Debugger = "{ransom string}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
niu.exe
Debugger = "{ransom string}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
guardxup.exe
Debugger = "{ransom string}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamgui.exe
Debugger = "{ransom string}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbam.exe
Debugger = "{ransom string}.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
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
- update.microsoft.com
- microsoft.com
- windowsupdate.microsoft.com
It deletes the initially executed copy of itself
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:
- Symantec
- AVG
- Kaspersky
- avast! Antivirus
- Microsoft Security Essentials
- Bdagent
- Trend Micro Titanium
- McAfee
- Sophos
- ArcaBit
- Baidu Antivirus
- Webroot SecureAnywhere
- ZoneAlarm
- F-Secure
- Panda
- Bkav
- Ad-Aware
- BullGuard
- Rising Antivirus
- PC Tools Protection
- VIPRE Antivirus
- F-PROT
- Outpost Security Suite
- Norman Data Defense Systems
- K7
- Ikarus
- CA Anti-Virus
- Emsisoft Anti-Malware
- Comodo Antivirus
- G Data AntiVirus
- AhnLab V3
- Malwarebytes
SOLUTION
9.750
11.710.09
05 Jun 2015
11.711.00
05 Jun 2015
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\Microsoft\Windows\CurrentVersion\Run
- Windows Update Service = "%Program Files%\Common Files\AudioDriverSFX\ftwxlmwgs.exe"
- Windows Update Service = "%Program Files%\Common Files\AudioDriverSFX\ftwxlmwgs.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
- TaskbarNoNotification = "1"
- TaskbarNoNotification = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\BavUpdater.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\adaware.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\niu.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\guardxup.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbamgui.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbam.exe
- Debugger = "{ransom string}.exe"
- Debugger = "{ransom string}.exe"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.LML. 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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