BKDR_ANDROM.WWT
Worm:Win32/Gamarue.AU (Microsoft)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor arrives as attachment to mass-mailed email messages.
It executes commands from a remote malicious user, effectively compromising the affected system.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
263,168 bytes
EXE
Yes
24 Aug 2015
Arrival Details
This backdoor arrives as attachment to mass-mailed email messages.
Installation
This backdoor drops the following files:
- %User Temp%\cdo{random numbers}.dll
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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 drops the following copies of itself into the affected system:
- %All Users Profile%\ms{random}.exe
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData on 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 adds the following processes:
- msiexec.exe
It injects itself into the following processes as part of its memory residency routine:
- explorer.exe
- created msiexec.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random number} = "%All Users Profile%\ms{random}.exe"
Other System Modifications
This backdoor modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download a file directed by C&C server, save it as %User Temp%\KB{8 random numbers}.exe and execute it
- Download a file directed by C&C server, save it as %All User Profile%\ms{random number}.dat and load it
- Download a file directed by C&C server, save it as %All User Profile%\ms{random}.exe:{random number}
- Copy %System%\cdosys.dll to %User Temp%\cdo{random number}.dll and load it
- Start a process
- Uninstall itself
- Perform remote shell commands
- Restart system
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}revsafcetgrefasfda4f3.ru/gate.php
- http://{BLOCKED}fvdfmbhty5ouihksdfs.com/gate.php
- http://{BLOCKED}dobe.com/gate.php
Information Theft
This backdoor gathers the following data:
- Operating system information
- Local IP address
- Root volume serial number
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
- update.microsoft.com
- microsoft.com
- google.com
- bing.com
- yahoo.com
It does the following:
- Checks if it is being run in a virtual environment or emulation software. If so, it will perform infinite sleep.
- Checks if there is a running network monitoring software in the affected machine. If found, it will perform infinite sleep.
- Connects to the following Network Time Protocol (NTP) servers:
- {BLOCKED}ol.ntp.org
- {BLOCKED}rica.pool.ntp.org
- {BLOCKED}eania.pool.ntp.org
- {BLOCKED}ia.pool.ntp.org
- {BLOCKED}uth-america.pool.ntp.org
- {BLOCKED}rth-america.pool.ntp.org
- {BLOCKED}rope.pool.ntp.org
It deletes the initially executed copy of itself
SOLUTION
9.750
11.876.05
26 Aug 2015
11.877.00
26 Aug 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
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {random number} = "%All Users Profile%\ms{random}.exe"
- {random number} = "%All Users Profile%\ms{random}.exe"
Step 5
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out 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"
Step 6
Search and delete this file
- %All User Profile%\ms{random}.exe
- %All User Profile%\ms{random number}.dat
- %User Temp%\KB{8 random numbers}.exe
- %User Temp%\cdo{random number}.dll
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ANDROM.WWT. 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.
Step 8
Scan your computer with your Trend Micro product to delete files detected as BKDR_ANDROM.WWT. 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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