This attachment will not be executed by viewing the message in the preview pane. The attachment must be executed to begin delivering its payload. Upon execution, W32.Goner.A@mm starts by displaying the following window.
In the background, the worm sends itself to all addresses in the the Microsoft Outlook address book. The email appears as follows.
The worm has been packed using a known Portable Executable (PE) packer. The size of the unpacked worm is approximately 159 KB.
The worm adds the value
to the registry key
- %SYSTEM% is the path to the Windows System folder. In most cases this would be C:\Windows\System; however, the location could be different if the Windows System folder has been installed to a different location.
- The value is the same as the value as the name of the file (the value data) that is being called.
Once the registry key has been added, the worm will attempt to terminate the processes of common anti-virus and firewall products. The files that it attempts to terminat are as follows:
Some anti-virus vendors have reported that the file iamapp.exe will have its process terminated. This is not correct.. Symantec Security Response has verified that the iamapp.exe process is not terminated by Goner, nor is the file deleted.
If such a process is found, the worm will delete the executable file and all files contained within the same folder and subfolders where the given file resides. If the files are in use and cannot be deleted, the file %SYSTEM%\Wininit.ini is created, and is used to delete the files when the computer restarts.
On Windows NT/2000/XP computers, the files are deleted by using the following registry key:
where the files to be deleted are present in the value
W32.Goner.A@mm is capable of spreading over the ICQ network. If ICQ is installed on an infected computer, the worm will do the following:
- Check for the version of the ICQ .dll file that contains the APIs that will be used. If the correct version is found, the worm proceeds.
- Retrieve a list of all "buddies" who are currently online.
- Retrieve information about each user individually. This information is required to be able to send files.
- Send itself to all users on the list.
If mIRC is installed, this worm can insert scripts into the mIRC folder. This allows the computer to be used in DoS attacks. Currently, the IRC channel used for controlling the worm has been blocked by IRC Operators. This will prevent usage of infected systems in a DoS attack.
Finally, the worm displays the following fake error message:
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":