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Worm:Win32/Xtrat.C

First posted on 29 July 2015.
Source: Microsoft

Aliases :

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

Explanation :

Threat behavior

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

• %SystemRoot%\dlls\adsl.exe
• %TEMP% \322htr.exe
• %TEMP% \710march.exe
• %TEMP% \710march.exe.exe
• %TEMP% \dlshosts.exe
• %APPDATA% \roaming\microsoft\internet explorer\quick launch\launch internet explorer browser.lnk
• %APPDATA% \roaming\microsoft\windows\start menu\programs\startup\a6bb84e8814fcaa6951c95e3faa45466.exe
• %USERPROFILE% \documents\msdcsc\msdcsc.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: "a6bb84e8814fcaa6951c95e3faa45466"
With data: ""c:\users\administrator\appdata\local\temp\dlshosts.exe" .."
Sets value: "HKCU"
With data: "%SystemRoot%\dlls\adsl.exe"
Sets value: "MicroUpdate"
With data: "c:\users\administrator\documents\msdcsc\msdcsc.exe"
In subkey: HKLM\Software\Microsoft\Active Setup\Installed Components\{VTVM542I-8743-2C38-TQKC-K3057FDG022L}
Sets value: "StubPath"
With data: "%SystemRoot%\dlls\adsl.exe"
In subkey: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Sets value: "UserInit"
With data: "\userinit.exe,c:\users\administrator\documents\msdcsc\msdcsc.exe"
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "a6bb84e8814fcaa6951c95e3faa45466"
With data: ""c:\users\administrator\appdata\local\temp\dlshosts.exe" .."
Sets value: "HKLM"
With data: "%SystemRoot%\dlls\adsl.exe"


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



Payload


Connects to a remote host

We have seen this threat connect to a remote host, including:

• datac1.ddns.net using port 53
• mz3ro.no-ip.org 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

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

• iexplore.exe

This malware description was published using automated analysis of file SHA1 23d254568fdf6a4929172d2d6e455366eabbe7c4.

Symptoms

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

• You see a file similar to:
• %SystemRoot%\dlls\adsl.exe
• %TEMP% \322htr.exe
• %TEMP% \710march.exe
• %TEMP% \710march.exe.exe
• %TEMP% \dlshosts.exe
• %APPDATA% \roaming\microsoft\internet explorer\quick launch\launch internet explorer browser.lnk
• %APPDATA% \roaming\microsoft\windows\start menu\programs\startup\a6bb84e8814fcaa6951c95e3faa45466.exe
• %USERPROFILE% \documents\msdcsc\msdcsc.exe
  
• You see registry modifications such as:
• In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "a6bb84e8814fcaa6951c95e3faa45466"
  With data: ""c:\users\administrator\appdata\local\temp\dlshosts.exe" .."
  
  
• In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "HKCU"
  With data: "%SystemRoot%\dlls\adsl.exe"
  
  
• In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "MicroUpdate"
  With data: "c:\users\administrator\documents\msdcsc\msdcsc.exe"
  
  
• In subkey: HKLM\Software\Microsoft\Active Setup\Installed Components\{VTVM542I-8743-2C38-TQKC-K3057FDG022L}
  Sets value: "StubPath"
  With data: "%SystemRoot%\dlls\adsl.exe"
  
  
• In subkey: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
  Sets value: "UserInit"
  With data: "\userinit.exe,c:\users\administrator\documents\msdcsc\msdcsc.exe"
  
  
• In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "a6bb84e8814fcaa6951c95e3faa45466"
  With data: ""c:\users\administrator\appdata\local\temp\dlshosts.exe" .."
  
  
• In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "HKLM"
  With data: "%SystemRoot%\dlls\adsl.exe"

Last update 29 July 2015

 

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