USERIO.SYS

Rootkit

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Associated Malware Groups

The filename is associated with the malware group:

Rootkit

File Behavior

USERIO.SYS has been the subject of the following behavior:

Created as a new Background Service on the machine

Country Of Origin

The filename USERIO.SYS was first seen on Feb 27 2009 in the following geographical regions of the Webroot community:

South Africa on Feb 27 2009
The United Kingdom on Aug 9 2009

Filesizes

The following file size has been seen:

3,512 bytes
8,936 bytes

File Type

The filename USERIO.SYS refers to an object.

Help the Webroot Community to fight cyber crime

We are always looking for ways to improve the quality and speed of research to help us protect you from malicious software and cyber crime.

The filename referred to in this report is often associated with PC infections. If you have a program of this name on your PC and would like to help our research please tell us what you know in the form below:

I have this file on my PC and believe it is an infection
I have this file on my PC and think it has made my PC slower
My firewall asked if I wanted to let this file have access to the Internet
My PC will not work since I noticed this file on it
My antivirus detected this file but won't remove it
I know what this file is and believe it is a Safe program
I am the author of this file and would like to discuss how to have it reclassified as safe

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