IOS.Lastacloud

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Discovered: December 12, 2014
Updated: December 15, 2014 10:36:40 AM
Type: Trojan
Systems Affected: iOS

IOS.Lastacloud is a Trojan horse that steals information from the compromised device. It may also download potentially malicious files.

Antivirus Protection Dates

  • Initial Rapid Release version December 12, 2014 revision 009
  • Latest Rapid Release version April 29, 2018 revision 019
  • Initial Daily Certified version December 13, 2014 revision 001
  • Latest Daily Certified version April 29, 2018 revision 034
  • Initial Weekly Certified release date December 17, 2014

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


Technical Description

The Trojan horse can be installed on jailbroken iOS devices.

When the Trojan is executed, it drops the following file to install itself:

  • /var/root/Media/Cydia/AutoInstall/d.deb

Note: The file is deleted once the Trojan is installed.

The Trojan creates the following files:
  • /usr/bin/C
  • /System/Library/LaunchDaemons/com.apple.tor.plist
  • /usr/bin/cores
  • /usr/bin/cores2

The Trojan connects to the following location to check for an internet connection:
  • www.apple.com

The Trojan may steal the following information from the compromised device:
  • Address book contents
  • ICCID
  • Platform type
  • Name
  • Model
  • System version
  • Free space
  • Total space
  • CPU frequency
  • CPU count
  • Total memory
  • Used memory
  • Max socket buffer size
  • Locale identifier
  • Language display name
  • Default time zone
  • Local time zone
  • Phone number
  • Carrier name
  • Carrier bundle name
  • ISO country name
  • Connection state
  • MAC address
  • Contents of /private/var/root/Library/Lockdown/data_ark.plist
  • Safari history

The Trojan connects to a remote server using information from an encrypted configuration file in the following location:
  • /usr/bin/cores

The encrypted configuration file contains the following information:
  • Server
  • User name
  • Password

The Trojan may download and install a package in the following location:
  • /var/root/Media/Cydia/AutoInstall/

The Trojan may download an additional configuration file and save it in the following location:
  • /usr/bin/cores2

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.