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Backdoor:Win32/Bergat.C


First posted on 15 October 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Bergat.C.

Explanation :

Threat behavior

Installation
This threat can create files on your PC, including:

  • %APPDATA%\microsoft\windows\b0f9zfqwwevc\b0f9zfqwwevc.dat
  • %APPDATA%\microsoft\skype„¢.exe


It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "HKCU"
With data: "%APPDATA%\microsoft\skype„¢.exe"
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "HKLM"
With data: "%APPDATA%\microsoft\skype„¢.exe"


The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.



Payload


Allows backdoor access and control

This threat can give a malicious hacker access and control of your PC. They can then perform a number of different actions, such as:

  • Deleting files
  • Downloading and running files
  • Logging your keystrokes or stealing your sensitive data
  • Modifying your system settings
  • Running or stopping applications
  • Spreading malware to other PCs
  • Uploading files


It can stop some processes from running on your PC, including:

  • explorer.exe
  • firefox.exe


Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

  • B0f9zfqWweVC
  • B0f9zfqWweVCPERSIST
  • CYBERGATEUPDATE


It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 7a2b5295a153b2f050f3b59d28ed73757671c3a2.

Symptoms

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

  • You see a file similar to:
    • %APPDATA%\microsoft\windows\b0f9zfqwwevc\b0f9zfqwwevc.dat
    • %APPDATA%\microsoft\skype„¢.exe
  • You see registry modifications such as:
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "HKCU"
      With data: "%APPDATA%\microsoft\skype„¢.exe"

    • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "HKLM"
      With data: "%APPDATA%\microsoft\skype„¢.exe"

  • You see the following mutex:
    • B0f9zfqWweVC
    • B0f9zfqWweVCPERSIST
    • CYBERGATEUPDATE

Last update 15 October 2015

 

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