Linux.Amnesiark

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Discovered: April 07, 2017
Updated: April 07, 2017 2:51:05 PM
Type: Trojan
Systems Affected: Linux
CVE References: CVE-2014-6271

Linux.Amnesiark is a Trojan horse that opens a back door on the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version April 07, 2017 revision 005
  • Latest Rapid Release version June 20, 2018 revision 032
  • Initial Daily Certified version April 07, 2017 revision 008
  • Latest Daily Certified version June 21, 2018 revision 001
  • Initial Weekly Certified release date April 12, 2017

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Mark Anthony Balanza

Discovered: April 07, 2017
Updated: April 07, 2017 2:51:05 PM
Type: Trojan
Systems Affected: Linux
CVE References: CVE-2014-6271

This Trojan may arrive through exploitation of the GNU Bash Remote Code Execution Vulnerability (CVE-2014-6271) and other remotely exploitable vulnerabilities.

When executed, the Trojan creates the following files:

  • /tmp/.radioactive
  • /tmp/plump
  • /etc/init.d/radioactive
  • /etc/cron.daily/radioactive

The Trojan then attempts to end the following processes:
  • ddoscc.sys
  • cocks.sh
  • .lizardsquad1
  • lightaidra
  • kaiten
  • jackmymipsel
  • jackmymips
  • jackmysh4
  • jackmyx86
  • jackmyarmv6
  • jackmyi686
  • jackmypowerpc
  • jackmyi586
  • jackmym86k
  • jackmysparc
  • telarmv6
  • teli586
  • teli686
  • telmips
  • telmipsel
  • telpowerpc
  • telsh4
  • telx86

The Trojan opens a back door to the following location, allowing an attacker access to the compromised computer:
  • 188.209.52.40

The Trojan may then be commanded to spread itself to another computer using the GNU Bash Remote Code Execution Vulnerability (CVE-2014-6271).

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.

Writeup By: Mark Anthony Balanza

Discovered: April 07, 2017
Updated: April 07, 2017 2:51:05 PM
Type: Trojan
Systems Affected: Linux
CVE References: CVE-2014-6271

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
To obtain the most recent virus definitions run LiveUpdate. For Symantec AntiVirus for Linux, LiveUpdate definitions are updated regularly.

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: Mark Anthony Balanza