SYS.EXE

File Behavior

SYS.EXE has been seen to perform the following behavior:

• This Process is a file infector which modifies program files to include a copy of the infection
• Registers a Dynamic Link Library File
• This process creates other processes on disk
• This Process Deletes Other Processes From Disk
• This Process looks to see what security products and services are running on the system
• Disables safe mode on your PC
• Looks at the contents of the autoexec.bat file
• Drops known malicious software during execution
• Accesses web sites that have been associated with malicious software
• Reads email address and phone book details
• Uses DNS to retrieve the IP address for web sites
• Visits web sites on your PC without you knowing
• Executes a Process
• Injects code into other processes
• Disables the Notification Balloon for the Windows Security Center
• Disables Access to the Windows Registry Editior
• Disables Access to the Task Manager built into Windows
• Modifies Windows Security Policies to restrict/expand User Privileges on the machine
• Automatically changes your firewall settings to allow itself or other programs to communicate over the internet
• Adds products to the system registry
• Adds a Registry Key (RUN) to auto start Programs on system start up
• Disables the Built in Windows System Restore Feature
• Writes to another Process's Virtual Memory (Process Hijacking)
• Changes the Windows Security Center to stop Antivirus status alerts from being displayed
• Changes the Windows Security Center to stop Firewall status alerts from being displayed
• Changes the Windows Security Center to stop Firewall override alerts from being displayed
• Changes the Windows Security Center to stop warnings from being displayed if automatic Windows Updates are not enabled
• Modifies firewall settings, without user permission so it is not blocked from accessing the Internet
• Injects code into other processes
• Creates a new Background Service on the machine
• Makes outbound connections to other computers using NETBIOSOUT protocols
• Creates system tray popups, messages, errors and security warnings
• The Process is packed and/or encrypted using a software packing process
• Copies files
• Performs DNS look ups to resolve URL IP addresses

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

• Added as a Registry auto start to load Program on Boot up
• Created as a process on disk
• Executed as a Process
• Copied to multiple locations on the system
• Created by processes which appear to be checking for interception by security products
• Has code inserted into its Virtual Memory space by other programs
• Terminated as a Process
• Deleted as a process from disk
• Registered as a Dynamic Link Library File