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This spyware uses social engineering methods to lure users into performing certain actions that may, directly or indirectly, cause malicious routines to be performed. Specifically, it takes advantage the advantage of the controversial news about an allegedly missing four-year-old girl from Mexico. Upon investigation, it was found that the attack came from a Mexican botnet which aims to steal banking/financial-related information from users.
Upon execution, it drops the file, register.bat which terminates an existing svxhost.exe process, deletes the file and the registry associated with it. It then starts a new instance of the malware process.
Once executed, it performs several commands such as deleting of files, downloading and executing other malicious files, logging keystrokes to steal sensitive data, terminating applications and uploading of files.
This spyware executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information. However, as of this writing, the said sites are inaccessible.
It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.
This spyware may be downloaded from the following remote sites:
This spyware drops the following component file(s):
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Runsvxhost = "%Windows%\WinSxS\x86_svxhost.VC90.MFC_1fc8b3b9a1e18e3b_9.0.30729.4148_x-ww_a57c1f53\svxhost.exe"
Other System Modifications
This spyware adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\WinRAR SFX%Windows%WinSxS%x86_svxhost.VC90.MFC_1fc8b3b9a1e18e3b_9.0.30729.4148_x-ww_a57c1f53% = "%Windows%\WinSxS\x86_svxhost.VC90.MFC_1fc8b3b9a1e18e3b_9.0.30729.4148_x-ww_a57c1f53"
It adds the following registry keys as part of its installation routine:
This spyware executes the following commands from a remote malicious user:
It connects to the following websites to send and receive information:
It posts the following information to its command and control (C&C) server:
However, as of this writing, the said sites are inaccessible.
This spyware drops the following files:
This spyware connects to the following URL(s) to get the affected system's IP address:
It does the following:
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Remove the malware/grayware file dropped/downloaded by TSPY_MEXBANK.A
Restart in Safe Mode
To restart in Safe Mode:
• For Windows 2000 users
• For Windows XP users
• For Windows Server 2003 users
• For Windows Vista and Windows 7 users
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.
To delete the registry key this malware/grayware/spyware created:
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.
To delete the registry value this malware/grayware created:
Search and delete this folder
To delete the malware/grayware folder:
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_MEXBANK.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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