TSPY_ZBOT.LTM
FSecure : Suspicious:W32/Malware!Gemini
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.
It may be injected into processes running in memory.
It opens a random port to allow a remote user to connect to the affected system. Once a successful connection is established, the remote user executes commands on the affected system.
It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
TECHNICAL DETAILS
Random TCP ports
154,112 bytes
PE
Yes
09 Dec 2010
Compromises system security, Downloads files
Arrival Details
This Trojan may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
However, as of this writing, the said sites are inaccessible.
Installation
This Trojan drops the following files:
- %Application Data%\{random1}\{random}.exe - copy of itself
- %Application Data%\{random2}\{random}.{3 random alpha character extension name} - encrypted data
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It creates the following folders:
- %Application Data%\{random1}
- %Application Data%\{random2}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It is injected into the following processes running in memory:
- ctfmon.exe
- dwm.exe
- explorer.exe
- rdpclip.exe
- taskeng.exe
- taskhost.exe
- wscntfy.exe
It may be injected into processes running in memory.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{GUID} = %Application Data%\{random}\{random name}.EXE
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
{random}
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%WINDOWS%\EXPLORER.EXE = %WINDOWS%\EXPLORER.EXE:*:Enabled:Windows Explorer
Backdoor Routine
This Trojan opens a random port to allow a remote user to connect to the affected system. Once a successful connection is established, the remote user executes commands on the affected system.
Information Theft
This Trojan attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
It accesses the following site to download its configuration file:
- http://www.{BLOCKED}6-saintbenoit.net/cache/x/q/weblog.bin
Other Details
This Trojan does the following:
- It gathers the following information:
- Personal Certificates
- FTP credentials
- Flashplayer data
- Internet session cookies
SOLUTION
8.900
7.690.02
09 Dec 2010
12/9/2010 12:00:00 AM
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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
- {GUID} = %Application Data%\{random}\{random name}.EXE
- {GUID} = %Application Data%\{random}\{random name}.EXE
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %WINDOWS%\EXPLORER.EXE = %WINDOWS%\EXPLORER.EXE:*:Enabled:Windows Explorer
- %WINDOWS%\EXPLORER.EXE = %WINDOWS%\EXPLORER.EXE:*:Enabled:Windows Explorer
Step 4
Delete this registry key
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_CURRENT_USER\Software\Microsoft
- {random}
- {random}
Step 5
Search and delete these folders
Step 6
Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.LTM. 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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