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Short description

Win32/Conficker.AE is a worm that spreads via shared folders and removable media. It connects to remote machines in attempt to exploit the Server Service vulnerability.

Installation

When executed, the worm copies itself in some of the the following locations:

A string with variable content is used instead of %variable% .

The worm loads and injects the %variable%.dll library into the following processes:

The worm registers itself as a system service with a name combined from the following strings:

In order to be executed on every system start, the worm sets the following Registry entry:

The following Registry entries are set:

A string with variable content is used instead of %random service name% .

The following Registry entries are removed:

Spreading

The worm starts a HTTP server on a random port.

By connecting to remote machines to port TCP 139, 445 it tries to exploit the Server Service .

If successful, the remote computer attempts to connect to the infected computer and download a copy of the worm .

It is a DLL library with the following extension:

This vulnerability is described in Microsoft Security Bulletin MS08-067 .

Spreading via shared folders

The worm tries to copy itself into shared folders of machines on a local network.

The following usernames are used:

The following passwords are used:

The following filename is used:

The worm schedules a task that causes the following file to be executed daily:

Spreading on removable media

The worm copies itself into existing folders of removable drives.

The following filename is used:

A string with variable content is used instead of %variable1-3% .

The worm creates the following file:

Thus, the worm ensures it is started each time infected media is inserted into the computer.

Other information

The following services are disabled:

The worm launches the following processes:

The worm blocks access to any domains that contain any of the following strings in their name:

The worm will attempt to download several files from the Internet. The files are then executed.

The worm runs only encrypted and properly signed files.

These are stored in the following locations:

A string with variable content is used instead of %variable% .

The worm may set the following Registry entries:

The performed data entry creates an exception in the Windows Firewall program.

The worm connects to the following addresses:

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