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TrojanDropper:Win32/Dexel.A


First posted on 06 August 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDropper:Win32/Dexel.A.

Explanation :

Threat behavior

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

  • c:\users\administrator\appdata\local\temp\{09a405f0-0a5f-4cfe-a424-a56e9a3186f}\windefender.exe
  • c:\users\administrator\appdata\local\temp\xelag.exe
  • c:\users\administrator\appdata\roaming\microsoft\windows\start menu\programs\startup\download_manager.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: "Msiexec"
With data: "c:\users\admini~1\appdata\local\temp\{09a405f0-0a5f-4cfe-a424-a56e9a3186f}\windefender.exe"
Sets value: "MSKERNEL"
With data: "c:\users\admini~1\appdata\local\temp\xelag.exe"
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "MSKERNEL"
With data: "c:\users\admini~1\appdata\local\temp\xelag.exe"


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



Payload


Installs malware or unwanted software

This trojan can install other malware or unwanted software onto your PC.



This malware description was published using automated analysis of file SHA1 0c22132b72893a8c769086742b040fb11a62649d.

Symptoms

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

  • You see a file similar to:
    • c:\users\administrator\appdata\local\temp\{09a405f0-0a5f-4cfe-a424-a56e9a3186f}\windefender.exe
    • c:\users\administrator\appdata\local\temp\xelag.exe
    • c:\users\administrator\appdata\roaming\microsoft\windows\start menu\programs\startup\download_manager.exe
  • You see registry modifications such as:
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "Msiexec"
      With data: "c:\users\admini~1\appdata\local\temp\{09a405f0-0a5f-4cfe-a424-a56e9a3186f}\windefender.exe"

    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "MSKERNEL"
      With data: "c:\users\admini~1\appdata\local\temp\xelag.exe"

    • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "MSKERNEL"
      With data: "c:\users\admini~1\appdata\local\temp\xelag.exe"

Last update 06 August 2015

 

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