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Backdoor:Win32/Wencho.A

First posted on 12 November 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Wencho.A.

Explanation :

Threat behavior

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

• %TEMP%\taskhost.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: "winecho."
With data: "c:\users\admini~1\appdata\local\temp\taskhost.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

The threat launches a PowerShell window with a malicious encoded reverse shell script payload that opens a backdoor on your PC.

The backdoor can then be used by a malicious hacker to gain access and control of your PC. The hacker can 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

Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:

• {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}

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 d3cb8024009c0e92f2c69c0a143d2d4462897706.

Symptoms

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

• You see a file similar to:
  • %TEMP%\taskhost.exe

• You see registry modifications such as:
  
  • In subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    Sets value: "winecho."
    With data: "c:\users\admini~1\appdata\local\temp\taskhost.exe"
    
    

• You see the following mutex:
  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}

Last update 12 November 2015

 

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