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Adware:Win32/Doma

First posted on 23 October 2015.
Source: Microsoft

Aliases :

There are no other names known for Adware:Win32/Doma.

Explanation :

Threat behavior

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

• %LOCALAPPDATA%\y1a5vtctzukybjz\y3a5bzdwzv8ydtz.exe
• %TEMP%\nsi26f4.tmp\base64.dll
• %TEMP%\nsi26f4.tmp\inetc.dll
• %TEMP%\nsi26f4.tmp\system.dll
• %TEMP%\nsi26f4.tmp\threadtimer.dll
• %TEMP%\nslef1b.tmp\base64.dll
• %TEMP%\nslef1b.tmp\nsisdl.dll
• %TEMP%\nslef1b.tmp\userinfo.dll
• \bm.lnk

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



Payload
Displays ads that you can't control

This program can show you extra ads. These ads can appear:

• In your web browser: such as search helpers, hover links, and banner ads.
• Outside of your web browser: such as pop ups, balloon ads, and toast notifications.

These advertisements would not be shown if this program wasn't installed on your PC.

The messages might look similar to this:





Connects to a remote host

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

• a1us6j2z.recordgate.com using port 53
• tu5amrmm.systotal.com using port 53
• vuae4kwm.dataurls.com using port 53
• api.media-tractor.com using port 53
• qim2bd2j.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:

• pop_under.exe
• y3a5bzdwzv8ydtz.exe

Additional information

Creates a mutex

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

• {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
• w2t39n064c0ky6b4m8d98vom
• zm3zouh5o0739im2147ltkx1

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 03eee62aa706dc438d7fb52443bdccffcbe08f36.

Symptoms

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

• You see a file similar to:
  • %LOCALAPPDATA%\y1a5vtctzukybjz\y3a5bzdwzv8ydtz.exe
  • %TEMP%\nsi26f4.tmp\base64.dll
  • %TEMP%\nsi26f4.tmp\inetc.dll
  • %TEMP%\nsi26f4.tmp\system.dll
  • %TEMP%\nsi26f4.tmp\threadtimer.dll
  • %TEMP%\nslef1b.tmp\base64.dll
  • %TEMP%\nslef1b.tmp\nsisdl.dll
  • %TEMP%\nslef1b.tmp\userinfo.dll
  • \bm.lnk

• You see registry modifications such as:
  
  • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
    Sets value: "PendingFileRenameOperations"
    With data: "c:\users\admini~1\appdata\local\temp\nslef1b.tmp\base64.dll"
    
    
  • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
    Sets value: "PendingFileRenameOperations"
    With data: "c:\users\admini~1\appdata\local\temp\nslef1b.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\nsisdl.dll"
    
    
  • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
    Sets value: "PendingFileRenameOperations"
    With data: "c:\users\admini~1\appdata\local\temp\nslef1b.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\nsisdl.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\userinfo.dll"
    
    
  • In subkey: HKLM\System\CurrentControlSet\Control\Session Manager
    Sets value: "PendingFileRenameOperations"
    With data: "c:\users\admini~1\appdata\local\temp\nslef1b.tmp\base64.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\nsisdl.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\userinfo.dll#R##N#\??\c:\users\admini~1\appdata\local\temp\nslef1b.tmp\"
    
    

• You see the following mutex:
  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
  • w2t39n064c0ky6b4m8d98vom
  • zm3zouh5o0739im2147ltkx1

Last update 23 October 2015

 

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