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TrojanDownloader:Win32/ExtenBro.A


First posted on 31 August 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDownloader:Win32/ExtenBro.A.

Explanation :

Threat behavior

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

  • c:\users\public\desktop\download 1375892040_nee...lnk


It can make various registry changes during its installation, including:

  • In subkey: HKLM\Software\Classes\CLSID\{C379EAD1-CB34-4B09-AF6B-7E587F8BCD80}\LocalServer32
    Sets value: "(default)"
    With data: ""

  • In subkey: HKLM\Software\Classes\Malware.DynamicNS\Clsid
    Sets value: "(default)"
    With data: "{c379ead1-cb34-4b09-af6b-7e587f8bcd80}"


Payload


Downloads malware or unwanted software

This threat can download other malware and unwanted software onto your PC.



Connects to a remote host

We have seen this threat connect to a remote host, including:
  • ya3s6suyvvtw362.eka-work.ru using port 53
  • download.torrentex.ru using port 53
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Download and run files (including updates or other malware)
  • Report a new infection to its author
  • Receive configuration or other data
  • Receive instructions from a malicious hacker
  • Search for your PC location
  • Upload information taken from your PC
  • Validate a digital certificate


Additional information

Creates a mutex

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

  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
  • MutexNPA_UnitVersioning_3516


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 3ff1b6312ea4d899a71a2ffbd2cbf0756f0af626.

Symptoms

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

  • You see a file similar to:
    • c:\users\public\desktop\download 1375892040_nee...lnk
  • You see registry modifications such as:
    • In subkey: HKLM\Software\Classes\CLSID\{C379EAD1-CB34-4B09-AF6B-7E587F8BCD80}\LocalServer32
      Sets value: "(default)"
      With data: ""

    • In subkey: HKLM\Software\Classes\Malware.DynamicNS\Clsid
      Sets value: "(default)"
      With data: "{c379ead1-cb34-4b09-af6b-7e587f8bcd80}"
  • You see the following mutex:
    • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
    • MutexNPA_UnitVersioning_3516

Last update 31 August 2015

 

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