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Trojan:Win32/Vbesgyc.A

First posted on 31 January 2014.
Source: Microsoft

Aliases :

There are no other names known for Trojan:Win32/Vbesgyc.A.

Explanation :

Threat behavior

Installation

Trojan:Win32/Vbesgyc.A copies itself to c:\documents and settings\administrator\application data\cftmon.exe. The malware changes the following registry entries so that it runs each time you start your PC:

In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "App.EXEName"
With data: "c:\documents and settings\administrator\application data\cftmon.exe" The malware creates the following files on your PC:

• c:\documents and settings\administrator\application data\pag.dat
• c:\documents and settings\administrator\local settings\temp\mmelt.bat

Payload

Changes system security settings

Trojan:Win32/Vbesgyc.A disables the Least Privileged User Account (LUA), also known as the Administrator in Admin Approval Mode user type. It does this by making the following registry modifications:

Sets value: "EnableLUA"
With data: "0"
In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

Note: Disabling the LUA allows all applications to run by default with all administrative privileges. You won't be asked for explicit consent.
This malware description was produced and published using automated analysis of file SHA1 ccab1547d795018b72f9f8ce60976916fe878dd9.Symptoms

System changes

The following could indicate that you have this threat on your PC:

• You have these files:
  
  c:\documents and settings\administrator\application data\cftmon.exe
  c:\documents and settings\administrator\application data\pag.dat
  c:\documents and settings\administrator\local settings\temp\mmelt.bat

• You see these entries or keys in your registry:
  
  Sets value: "App.EXEName"
  With data: "c:\documents and settings\administrator\application data\cftmon.exe"
  In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  
  Sets value: "EnableLUA"
  With data: "0"
  In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

Last update 31 January 2014

 

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