BKDR_ANDROM.NJS
Backdoor.Win32.Androm.fnox (Kaspersky), Backdoor.Androm (VBA32)
Windows
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 connects to a website to send and receive information.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
90,624 bytes
EXE
Yes
16 Aug 2018
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 drops the following copies of itself into the affected system and executes them:
- %Application Data%\ms{random}.exe
- %ProgramData%\ms{random}.exe (if run as Administrator)
(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, 7, and 8.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData in Windows Vista, 7, and 8.)
It adds the following processes:
- msiexec.exe
It injects codes into the following process(es):
- msiexec.exe
- explorer.exe
It terminates itself if it finds the following processes in the affected system's memory:
- vmwareuser.exe
- vmwareservice.exe
- vboxservice.exe
- vboxtray.exe
- sandboxiedcomlaunch.exe
- sandboxierpcss.exe
- procmon.exe
- regmon.exe
- filemon.exe
- wireshark.exe
- netmon.exe
- prl_tools_service.exe
- prl_tools.exe
- prl_cc.exe
- sharedintapp.exe
- vmtoolsd.exe
- Vmsrvc.exe
- vmusrvc.exe
Autostart Technique
This Backdoor modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random number} = "%Application Data%\ms{random}.exe" or "%ProgramData%\ms{random}.exe" if run as Administrator
Other System Modifications
This Backdoor modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
TaskbarNoNotification = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
HideSCAHealth = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = 0
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 2
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Download exe
- Update plug-in
- Delete bot
- Install plug-in
It connects to the following websites to send and receive information:
- http://{BLOCKED}ashkd1.ru/and/gate.php
It posts the following information to its command and control (C&C) server:
- OS version
- VolumeSerialNumber
- Local IP address
- Botnet ID
- Administrator rights of current malware process
As of this writing, the said sites are inaccessible.
Process Termination
This Backdoor terminates the following services if found on the affected system:
- wscsvc
- SharedAccess
- MpsSvc
- WinDefend
- wuauserv
Other Details
This Backdoor deletes the initially executed copy of itself
SOLUTION
9.850
11.312.04
01 Dec 2014
11.313.00
02 Dec 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
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
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: Hidden = "2"
To: Hidden = "1"
- From: Hidden = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = "0"
To: ShowSuperHidden = "1"
- From: ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MpsSvc
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
Step 5
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
- {random number} = "%Application Data%\ms{random}.exe"
- {random number} = "%Application Data%\ms{random}.exe"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ANDROM.NJS. 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.