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TrojanDropper:Win32/Goyledr.A


First posted on 09 September 2015.
Source: Microsoft

Aliases :

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

Explanation :

Threat behavior

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

  • %APPDATA%\owzcen323f\write.exe


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

In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "write.exe"
With data: "%APPDATA%\owzcen323f\write.exe"


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. We have seen it install Trojan:Win32/Goyledr.A and Worm:Win32/Kasidet.D.



Connects to a remote host

We have seen this threat connect to a remote host, including:
  • rolein.in using port 80
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:

  • OWZCEN323F


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 a76ad8a662717845f96daba8286009d79ae6bb1b.

Symptoms

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

  • You see a file similar to:
    • %APPDATA%\owzcen323f\write.exe
    • \perfc009.dat
    • \perfh009.dat
  • You see registry modifications such as:
    • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "write.exe"
      With data: "%APPDATA%\owzcen323f\write.exe"
  • You see the following mutex:
    • OWZCEN323F

Last update 09 September 2015

 

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