SYSHOST.EXE

File Behavior

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

• Executes a Process
• Registers a Dynamic Link Library File
• The Process is packed and/or encrypted using a software packing process
• Terminates Processes
• This Process Contains User Mode Rootkit Functionality and can hide itself from the running process list
• Adds a Registry Key (RUN) to auto start Programs on system start up
• This Process is a file infector which modifies program files to include a copy of the infection
• Includes file creation code which could be used to test for interception by security products
• This Process Deletes Other Processes From Disk
• Enables an In Process Object/Server - Common with DLL Injections
• This process creates other processes on disk
• Automatically changes your firewall settings to allow itself or other programs to communicate over the internet
• Can make outbound communication to other computers, IM chat rooms and other services using IRC protocols
• Creates a TCP port which listens and is available for communication initiated by other computers
• Looks at the contents of the autoexec.bat file
• Reads email address and phone book details
• Uses rootkit techniques to conceal its presence, interrogation or removal

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

• Executed as a Process
• Created as a process on disk
• Has code inserted into its Virtual Memory space by other programs
• Copied to multiple locations on the system
• Deleted as a process from disk
• Added as a Registry auto start to load Program on Boot up
• Created as a new Background Service on the machine