Mocbot.A

Installation to the System

The bot's file is a PE executable, 7846 bytes long, packed with MEW file compressor. When the bot's file is started, it copies itself as 'wudpcom.exe' file to Windows System folder and then creates a service with following attributes:

• Service path: wudpcom.exe
• Service name: Windows UDP CommunicationService short name: wudpcom
• Description: Provides communication between clients and servers over UDP. If this service is stopped, UDP communication between clients and servers on the network will be impaired. If this service is disabled, any services that explicitly depend on it will fail to start.

Bot Functionality

When the bot is active, it connects to an IRC server, joins a particular channel, and acts as a bot there. The following IRC servers are used by the bot:

• bbjj.househot.com
• ypgw.wallloan.com

The bot joins to a password-protected IRC channel where the hacker can send commands to the bots in order to control infected computers. Several tasks can be performed, including the following:

• Perform SYN and UDP flood
• Download and execute files
• Start command shell
• Scan and exploit computers vulnerable to MS05-039

Spreading via MS05-039

The bot scans for random IP addresses and exploits a vulnerability in the Windows Plug and Play Service (MS05-039). Info on this PnP vulnerability is available here: https://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx

The vulnerability can be exploited via 139/TCP and 445/TCP.