BKDR_ANDROM.WSTV
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 deletes itself after execution.
TECHNICAL DETAILS
67,072 bytes
EXE
Yes
29 Aug 2014
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:
- %ProgramData%\explorer.exe (Windows Vista and 7 only)
- %All Users Profile%\explorer.exe
- %All Users Profile%\{random file name}.{random extension}
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).. %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
It stays resident in memory by creating the following process(es):
- msiexec.exe
It injects codes into the following process(es):
- 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\Run
Start WingMan Profiler = "%ProgramData%\explorer.exe" (Windows Vista and 7 only and if Java update is disabled in startup)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Start WingMan Profiler = "%All Users Profile%\explorer.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random digits} = "%All Users Profile%\{random file name}.{random extension}"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Downloads a file from the C&C server and saves it as %User Temp%\{random number}.exe
- Downloads a file from the C&C server and saves it as %System Root%\Documents and Settings\All Users\ms{random number}.dat and loads it
- Start a process
- Uninstall itself
- Remote command prompt
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}iemovieshop.ru/gateimg.php
- http://{BLOCKED}6bernie.ru/gateimg.php
- http://{BLOCKED}llz3mtltuqn.ru/gateimg.php
- http://{BLOCKED}tj9s4cy7ujmh.ru/gateimg.php
- http://{BLOCKED}9g8v4jcfhx.ru/gateimg.php
- http://{BLOCKED}il9vnq9mqup.ru/gateimg.php
- http://{BLOCKED}cjiuoygmuvt.ru/gateimg.php
- http://{BLOCKED}2yiymgqget1.ru/gateimg.php
- http://{BLOCKED}az4ppxjzhtja9.ru/gateimg.php
- http://{BLOCKED}s6cqnii.ru/gateimg.php
Other Details
This backdoor deletes itself after execution.
NOTES:
Where {random extension} can be any of the following:
- bat
- cmd
- com
- exe
- pif
- scr
SOLUTION
9.700
11.116.03
29 Aug 2014
11.117.00
30 Aug 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
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\Run
- Start WingMan Profiler = "%ProgramData%\explorer.exe" (Windows Vista and 7 only and if Java update is disabled in startup)
- Start WingMan Profiler = "%ProgramData%\explorer.exe" (Windows Vista and 7 only and if Java update is disabled in startup)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Start WingMan Profiler = "%All Users Profile%\explorer.exe"
- Start WingMan Profiler = "%All Users Profile%\explorer.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {random digits} = "%All Users Profile%\{random file name}.{random extension}"
- {random digits} = "%All Users Profile%\{random file name}.{random extension}"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ANDROM.WSTV. 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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