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Worm:Win32/Xtrat.D


First posted on 29 July 2015.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/Xtrat.D.

Explanation :

Threat behavior

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

  • %APPDATA%\microsoft\windows\yragnels.dat
  • %SystemRoot%\syswow\cmdl.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: "fixmapi"
With data: "%SystemRoot%\syswow\cmdl.exe"
In subkey: HKLM\Software\Microsoft\Active Setup\Installed Components\{YIU2143M-37VR-MWYU-DWKU-HBT7EB777YTD}
Sets value: "StubPath"
With data: "%SystemRoot%\syswow\cmdl.exe restart"


Payload


Connects to a remote host

We have seen this threat connect to a remote host, including:
  • caramelochpetinnew2.ddns.net 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:

  • XTREMEUPDATE
  • yRAGNels


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 5558c23286df085f8a16edd33db22b7d2e561534.

Symptoms

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

  • You see a file similar to:
    • %APPDATA%\microsoft\windows\yragnels.dat
    • %SystemRoot%\syswow\cmdl.exe
  • You see registry modifications such as:
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "fixmapi"
      With data: "%SystemRoot%\syswow\cmdl.exe"

    • In subkey: HKLM\Software\Microsoft\Active Setup\Installed Components\{YIU2143M-37VR-MWYU-DWKU-HBT7EB777YTD}
      Sets value: "StubPath"
      With data: "%SystemRoot%\syswow\cmdl.exe restart"

  • You see the following mutex:
    • XTREMEUPDATE
    • yRAGNels

Last update 29 July 2015

 

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