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Backdoor:Win32/Qakbot.U


First posted on 05 December 2014.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Qakbot.U.

Explanation :

Threat behavior

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

  • %APPDATA%\microsoft\megfimv\megfim.dll
  • %APPDATA%\microsoft\megfimv\megfimv.exe
  • %APPDATA%\microsoft\megfimv\megfimv32.dll


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: "FesCom"
With data: ""%APPDATA%\microsoft\megfimv\megfimv.exe" /c %SystemRoot%\fescom.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, including:

  • Downloading and running files
  • Injecting code into other running processes
  • Logging your keystrokes
  • Taking screen captures
  • Stealing your sensitive information


Additional information


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

  • Global\megfimv
  • Global\npviw
  • Global\reulvnt
  • Global\tjyza
  • Global\zuayuja
  • ibdqwmutnd
  • Malwarea
  • megfimva
  • mogpaik


This can be 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 59a8bd3f4cc24e16686113a62e7656383c2b9853. Symptoms

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

  • You see these files:
    • %APPDATA%\microsoft\megfimv\megfim.dll
    • %APPDATA%\microsoft\megfimv\megfimv.exe
    • %APPDATA%\microsoft\megfimv\megfimv32.dll
  • You see registry modifications such as:

    • In subkey: HKCU\software\microsoft\windows\currentversion\run
      Sets value: "FesCom"
      With data: ""%APPDATA%\microsoft\megfimv\megfimv.exe" /c %SystemRoot%\fescom.exe"
  • You see a mutex such as:
    • Global\megfimv
    • Global\npviw
    • Global\reulvnt
    • Global\tjyza
    • Global\zuayuja
    • ibdqwmutnd
    • Malwarea
    • megfimva
    • mogpaik

Last update 05 December 2014

 

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