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TrojanDownloader:Win32/Jalaro.A


First posted on 29 September 2015.
Source: Microsoft

Aliases :

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

Explanation :

Threat behavior

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

  • %SystemRoot%\addins\jplay\addinexpress.ie.dll
  • %SystemRoot%\addins\jplay\interop.shdocvw.dll
  • %SystemRoot%\addins\jplay\jplay.dll
  • %SystemRoot%\addins\jplay\microsoft.mshtml.dll
  • %SystemRoot%\addins\jplay.exe
  • %TEMP%\nsncc4.tmp\nsexec.dll


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



  • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
    Sets value: "(default)"
    With data: "mscoree.dll"



    • Sets value: "Assembly"
      With data: "jplay, version=1.0.0.0, culture=neutral, publickeytoken=cec79227cc397e27"



    • Sets value: "Class"
      With data: "newplay.iemodule"



    • Sets value: "CodeBase"
      With data: "file:///c:/windows/addins/jplay/jplay.dll"



    • Sets value: "RuntimeVersion"
      With data: "v4.0.30319"



    • Sets value: "ThreadingModel"
      With data: "both"



  • In subkey: HKLM\Software\Classes\newplay.IEModule\CLSID
    Sets value: "(default)"
    With data: "{7f561e47-7f78-464e-ae5e-4fb2e9fdd88b}"



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



Payload


Downloads malware or unwanted software

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



It can stop some processes from running on your PC, including:

  • iexplore.exe


This malware description was published using automated analysis of file SHA1 904d7e45c524ddf773b338ca4d07b1be4f002ed4.

Symptoms

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

  • You see a file similar to:
    • %SystemRoot%\addins\jplay\addinexpress.ie.dll
    • %SystemRoot%\addins\jplay\interop.shdocvw.dll
    • %SystemRoot%\addins\jplay\jplay.dll
    • %SystemRoot%\addins\jplay\microsoft.mshtml.dll
    • %SystemRoot%\addins\jplay.exe
    • %TEMP%\nsncc4.tmp\nsexec.dll
  • You see registry modifications such as:
    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "(default)"
      With data: "mscoree.dll"

    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "Assembly"
      With data: "jplay, version=1.0.0.0, culture=neutral, publickeytoken=cec79227cc397e27"

    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "Class"
      With data: "newplay.iemodule"

    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "CodeBase"
      With data: "file:///c:/windows/addins/jplay/jplay.dll"

    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "RuntimeVersion"
      With data: "v4.0.30319"

    • In subkey: HKLM\Software\Classes\CLSID\{7F561E47-7F78-464E-AE5E-4FB2E9FDD88B}\InprocServer32
      Sets value: "ThreadingModel"
      With data: "both"

    • In subkey: HKLM\Software\Classes\newplay.IEModule\CLSID
      Sets value: "(default)"
      With data: "{7f561e47-7f78-464e-ae5e-4fb2e9fdd88b}"

Last update 29 September 2015

 

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