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Trend Micro has flagged this backdoor as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, it is circulating and building armies (drones) especially in Vietnam and the APAC region.
To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.
This backdoor may be unknowingly downloaded by a user while visiting malicious websites.
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunMicrosoft Office quick launch = %Program Files%\Microsoft Office\OFFICE11\OSA.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunMicrosoft Office quick launch = %Program Files%\Microsoft Office\OFFICE11\OSA.exe
This backdoor drops the following files:
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Based on analysis of the codes, it has the following capabilities:
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.
Remove malware files dropped/downloaded by BKDR_VBOT.A
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 these files
To delete malware/grayware component files:
Scan your computer with your Trend Micro product to delete files detected as BKDR_VBOT.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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