USER32.EXE

File Behavior

USER32.EXE has been seen to perform the following behavior:

• Writes to another Process's Virtual Memory (Process Hijacking)
• Disables Access to the Task Manager built into Windows
• Modifies Windows Security Policies to restrict/expand User Privileges on the machine
• Disables the built in Windows File Protection System
• This process creates other processes on disk
• This Process Deletes Other Processes From Disk
• Executes a Process
• Copies files
• Sets processes to start during user logon
• Injects code into other processes
• The Process is packed and/or encrypted using a software packing process
• This Process uses Anti Dissasembly Tricks to avoid analysis by security products
• Can communicate with other computer systems using HTTP protocols
• Creates a TCP port which listens and is available for communication initiated by other computers
• Adds products to the system registry
• Disables the Notification Balloon for the Windows Security Center
• Disables Access to the Windows Registry Editior
• Disables the Windows Security Center Service
• Enables Access to the Remote Registry Service Within Windows
• Disables Anonymous Access to the Windows Network Shares
• Disables the Default Windows Network Shares
• Prevents Installation Of Windows XP Service Pack 2
• Disables the DCOM Ability within Windows
• Checks for the use of debuggers
• Creates a new Background Service on the machine
• Looks at the contents of the autoexec.bat file
• Reads email address and phone book details
• Uses DNS to retrieve the IP address for web sites
• Uses reverse DNS to retrieve the host names on IP addresses
• Uses your PC to connect to Chat rooms
• The process hooks code into all running processes which could allow it to take control of the system or record keyboard input, mouse activity and screen contents
• Registers a Windows APPINIT DLL To be loaded in all processes
• Found on infected systems and resists interrogation by security products

USER32.EXE has been the subject of the following behavior:

• Created as a process on disk
• Executed as a Process
• Has code inserted into its Virtual Memory space by other programs
• Terminated as a Process
• Copied to multiple locations on the system
• Created as a new Background Service on the machine
• Added as a Service in the System Registry Current Control Set
• Deleted as a process from disk