Crowt.A is a worm that opens a backdoor, which allows to remotely control the affected computer and receive additional commands: download, delete or run files, restart the computer, end processes, etc.
Crowt.A also installs a keylogger, which could be used to reveal personal or confidential information, such as passwords.
On Windows XP/2000/NT computers, Crowt.A hooks certain operating system functions, which enables it to log keystrokes and mouse actions. The logged information is then sent to two different e-mail addresses.
This worm also connects to a certain web page in order to communicate that the computer has been affected.
Additionallly, it deletes all the cookies from the affected computer and opens the web browser and displays a certain website.
Crowt.A spreads via e-mail, in a message that uses the headlines in the CNN website in order to construct its text.