Category: Malware

Type: -

Aliases: Korgo.A, Worm.Win32.Padobot.b, Padobot


Korgo (aka Padobot) is a network worm written by the Russian Hangup Team virus group. It spreads throughout the Internet using a vulnerability in Microsoft Windows LSASS. A description of the vulnerability can be found in Microsoft Security Bulletin MS04-011:


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

The worm is written in C++ and is approximately 10KB in size, packed using UPX.

When launching, the worm copies itself to the Windows system directory under a random name, and registers this file in the system registry auto-run key:

  • [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] WinUpdate = %system%\name of file

It also creates a registry key

  • HKLM\SOFTWARE\Microsoft\Wireless Server = 1

It creates the mutexes "10", "u2" and "uterm5" to flag its presence in the system. The worm chooses the IP-addresses of random machines to infect and attack, similar to other worms which exploit the same LSASS vulnerability.

Once infected, a victim machine will display an error message that the LSASS service has failed. After this error message has been displayed, the computer may reboot.

The worm open TCP ports 113, 3067 and 2041 to receive commands.

It attempts to connect to several IRC servers to receive commands and transmit data.