BKDR_BANECHANT.A
Troj/Agent-AAZR (Sophos), Trojan horse Downloader.Generic13.ANHN (AVG), W32/Agent.RFK!tr.dldr (Fortinet), Trojan.Win32.Spy (Ikarus)
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
This Backdoor may be downloaded by other malware/grayware from remote sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
Arrival Details
This Backdoor may be downloaded by the following malware/grayware from remote sites:
- TROJ_MSDOWNL.A
Infection Points
This Backdoor arrives as a file downloaded from the following URLs:
- http://{BLOCKED}ecure.com/update/winword.pkg
Installation
This Backdoor drops the following copies of itself into the affected system and executes them:
- %ProgramData%\Google2\GoogleUpdate.exe (Windows Vista and higher versions)
- %System Root%\ProgramData\Google2\GoogleUpdate.exe (Versions lower than Windows Vista)
(Note: %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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It creates the following folders:
- %ProgramData%\Google2 (Windows Vista and higher versions)
- %System Root%\ProgramData (Versions lower than Windows Vista)
- %System Root%\ProgramData\Google2 (Versions lower than Windows Vista)
(Note: %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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- MM-Core-Running
Autostart Technique
This Backdoor drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\GoogleUpdate.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Download a file from C&C server and save it as %User Temp%\java.{random} and execute it
- Read a code from C&C server and execute it as a separate thread
- Uninstall itself
(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, 7, and 8.)
It posts the following information to its command and control (C&C) server:
- Operating system version
- Computer Name
- User Name
- List of currently running processes
- Full IP configuration information
- List of files and subdirectories in drives C to H
Other Details
This Backdoor connects to the following website to send and receive information:
- http://symbisecure.com/adserv/get.php
NOTES:
This backdoor connects to the following URL to read a part of its code and execute it in memory:
- http://{BLOCKED}r.no-ip.org/adserv/logo.jpg
It only connects to the mentioned URL when it detects three mouse clicks or more.
SOLUTION
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
Remove malware/grayware files that dropped/downloaded BKDR_BANECHANT.A. (Note: Please skip this step if the threats listed below have already been removed.)
- TROJ_MSDOWNL.A
Step 3
Restart in Safe Mode
Step 4
Search and delete this file
- %User Startup%\GoogleUpdate.lnk
- %User Temp%\java.{random}
Step 5
Search and delete these folders
- %ProgramData%\Google2 (Windows Vista and higher versions)
- %System Root%\ProgramData\Google2 (Versions lower than Windows Vista)
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_BANECHANT.A. 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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