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TrojanDropper:Win32/Soloniti.A


First posted on 28 September 2015.
Source: Microsoft

Aliases :

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

Explanation :

Threat behavior

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

  • %LOCALAPPDATA%\y0w5bzdvzw4yczy\y0w5bzdvzw4yczy.exe
  • %TEMP%\nsxbd91.tmp\base64.dll
  • %TEMP%\nsxbd91.tmp\nsisdl.dll
  • %TEMP%\nsxbd91.tmp\userinfo.dll
  • \loons.lnk


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.



Connects to a remote host

We have seen this threat connect to a remote host, including:
  • api.media-tractor.com using port 53
  • tx8ivujx.data-url.com 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:

  • loons.exe
  • y0w5bzdvzw4yczy.exe


Additional information

Creates a mutex

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

  • {B6EA544E-9884-44ef-A0A5-8474D46E72F9}
  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
  • ua0sv6tzu41f6i21xqn4


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 9d9872e137a48a12af916e31526099ff0335c4e0.

Symptoms

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

  • You see a file similar to:
    • %LOCALAPPDATA%\y0w5bzdvzw4yczy\y0w5bzdvzw4yczy.exe
    • %TEMP%\nsxbd91.tmp\base64.dll
    • %TEMP%\nsxbd91.tmp\nsisdl.dll
    • %TEMP%\nsxbd91.tmp\userinfo.dll
    • \loons.lnk
  • You see registry modifications such as:
    • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
      Sets value: "PendingFileRenameOperations"
      With data: "%TEMP%\nsxbd91.tmp\base64.dll"

    • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
      Sets value: "PendingFileRenameOperations"
      With data: "%TEMP%\nsxbd91.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\nsisdl.dll"

    • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
      Sets value: "PendingFileRenameOperations"
      With data: "%TEMP%\nsxbd91.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\nsisdl.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\userinfo.dll"

    • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
      Sets value: "PendingFileRenameOperations"
      With data: "%TEMP%\nsxbd91.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\nsisdl.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\userinfo.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nsxbd91.tmp\"
  • You see the following mutex:
    • {B6EA544E-9884-44ef-A0A5-8474D46E72F9}
    • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
    • ua0sv6tzu41f6i21xqn4

Last update 28 September 2015

 

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