Threat Explorer

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Linux.Kaiten

Linux.Kaiten

Discovered:
July 18, 2014
Updated:
September 29, 2014
Systems Affected:
Linux
CVE References:
CVE-2004-1692, CVE-2004-1693
Linux.Kaiten is a Trojan horse that opens a back door on the compromised computer that allows it to perform other malicious activities.

Antivirus Protection Dates

  • Initial Rapid Release version July 18, 2014 revision 019
  • Latest Rapid Release version April 07, 2017 revision 007
  • Initial Daily Certified version July 19, 2014 revision 001
  • Latest Daily Certified version April 08, 2017 revision 001
  • Initial Weekly Certified release date July 23, 2014
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
The Trojan must be manually installed and executed by the user.

When the Trojan is executed, it modifies the following file so it is executed every time a user logs in:
/etc/init.d/rc.local

The Trojan opens a back door on the compromised computer, and connects to the following location on the IRCU port (TCP 6667):
ich-hab.sytes.net

The Trojan may also connect to the following locations:
  • mumumu.duckdns.org
  • mummuu.prxy8080.com
  • jappyupdate.servehttp.com
  • linuxupdatejappy.servepics.com

The Trojan then joins an IRC channel and listens for commands allowing a remote attacker to perform the following actions:
  • End Processes
  • Download and execute files
  • Change client nickname
  • Change servers
  • Enable or disable packeting
  • Perform a distributed denial of service (DDoS) attack using SYN and UDP
  • flooding methods
  • Send UDP packets
  • Spoof an IP addresses
  • Terminate client

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
The following instructions pertain to Symantec AntiVirus for Linux.
  1. Update the virus definitions.
  2. Run a full system scan.

1. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions. For Symantec AntiVirus for Linux, LiveUpdate definitions are updated daily.
  • Downloading the definitions using Intelligent Updater. The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them.

2. To run a full system scan

To run a full system scan in Linux, open a command line and type the following:

sav manualscan --scan /

If any files are detected, follow the instructions displayed by your antivirus program.
Writeup By: Héctor Navarro Martín