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Worm:Win32/NeksMiner.A


First posted on 03 August 2015.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/NeksMiner.A.

Explanation :

Threat behavior

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

  • %APPDATA%\microsoft\windows\start menu\programs\startup\.exe
  • %APPDATA%\microsoft\windows\start menu\programs\startup\cnminer.lnk
  • %APPDATA%\nscpucnminer\cnminer.exe
  • %APPDATA%\nscpucnminer\nscpucnminer32.exe
  • %APPDATA%\nscpucnminer\nscpucnminer64.exe
  • %LOCALAPPDATA%\temp\nsa56c7.tmp\nsexec.dll
  • %LOCALAPPDATA%\temp\nsw59b5.tmp\inetc.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: "CNminer"
With data: "%APPDATA%\nscpucnminer\cnminer.exe"

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



Payload
This threat spreads through network drives. It is specifically designed to allow remote attacker control to perform Bitcoin mining activities. Affected machines might have traces of legitimate application and component related to its mining activities.

Additional information

We observed that this threat often spreads with the following (but not limited to) names and file extension:

  • images.scr
  • image.exe
  • imà ges.exe
  • monero.exe
  • monero.scr


Note: The above list is not an exhaustive list.



This malware description was published using automated analysis of file SHA1 7536f91d76b0fea3d67cb8ecaa09844129d5e86e.

Symptoms

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

  • You see a file similar to:
    • %APPDATA%\microsoft\windows\start menu\programs\startup\.exe
    • %APPDATA%\microsoft\windows\start menu\programs\startup\cnminer.lnk
    • %APPDATA%\nscpucnminer\cnminer.exe
    • %APPDATA%\nscpucnminer\nscpucnminer32.exe
    • %APPDATA%\nscpucnminer\nscpucnminer64.exe
    • images.scr
    • image.exe
    • imà ges.exe
    • %LOCALAPPDATA%\temp\nsa56c7.tmp\nsexec.dll
    • %LOCALAPPDATA%\temp\nsw59b5.tmp\inetc.dll
    • monero.exe
    • monero.scr
  • You see registry modifications such as:
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "CNminer"
      With data: "%APPDATA%\nscpucnminer\cnminer.exe"




Last update 03 August 2015

 

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