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TrojanProxy:Win32/Bunitu.K

First posted on 30 March 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanProxy:Win32/Bunitu.K.

Explanation :

Threat behavior

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

• %LOCALAPPDATA%\mzbsixb.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: "mzbsixb"
With data: "rundll32 "%LOCALAPPDATA%\mzbsixb.dll",mzbsixb"



Payload

Bypassess firewall


The threat bypasses the Windows Firewall so that it can establish a connection. It does this by adding itself to the list of authorized applications that can bypass the firewall:

In subkey: HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
Sets value: ""
With data: ":*:enabled:"

Additional information

Creates a mutex

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

• ATEX1-CESKL-AI9FM

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 602680cfb9ea9c91bbe729b00f212b830bca7bd9.

Symptoms

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

• You see a file similar to:
  • %LOCALAPPDATA%\mzbsixb.dll

• You see registry modifications such as:
  
  • In subkey: HKCU\software\microsoft\windows\currentversion\run
    Sets value: "mzbsixb"
    With data: "rundll32 "%LOCALAPPDATA%\mzbsixb.dll",mzbsixb"
    
    

• The presence of a mutex such as:
  • ATEX1-CESKL-AI9FM
  • GOOGLEUPDATE.EXE"

Last update 30 March 2015

 

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