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TrojanDownloader:Win32/Nystprac.A

First posted on 31 May 2016.
Source: Microsoft

Aliases :

There are no other names known for TrojanDownloader:Win32/Nystprac.A.

Explanation :

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

• %CurrentFolder%\malwaresrv.exe
• %ProgramFiles%\adobe\reader 8.0\reader\agm.dll
• %ProgramFiles% \adobe\reader 8.0\reader\rt3d.dll
• %ProgramFiles% \apppatch\netsyst96.dll
• %ProgramFiles% \microsoft\desktoplayer.exe
• %ProgramFiles% \mozilla firefox\dmlconf.dat
• %ProgramFiles% \steam\amf\amf-component-vce-windesktop32.dll
• %ProgramFiles% \steam\amf\mcl-windesktop32.dll
• %ProgramFiles% \steam\bin\mss32.dll
• %ProgramFiles% \steam\sdl2.dll

It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon Sets value: "Userinit"
With data: "\userinit.exe,,%ProgramFiles%\microsoft\desktoplayer.exe"


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

Payload

Downloads malware or unwanted software

This threat can download other malware and unwanted software onto your PC.

Connects to a remote host

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

• fget-career.com using port 443

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 a mutex on your PC. For example:

• KyUffThOkYwRRtgPP

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 578b547d37ff46adf3823d6a1a55052321afff93.

Last update 31 May 2016

 

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