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Torii virus. How to remove? (Uninstall guide)

removal by Ugnius Kiguolis - - | Type: Viruses

Torii virus – a sophisticated multi-stage malware that is capable of infecting a wide array of devices

Torii virus
Torii virus is a dangerous multi-stage botnet

Torii virus is a new malware strain that has been discovered by security experts in September 2018.[1] According to the report, this advanced cyber threat was functional since December 2017 and possibly even longer. The virus is capable of infecting a large variety of devices and functions as an IoT[2] botnet – it is able of propagating itself. Unlike botnets like Mirai or QBot, Torii botnet does not initiate active DDoS[3] attacks or crypto-mining but instead focuses on harvesting sensitive information. Once installed on the device, malware focuses on obfuscation by using multi-stage infection technique, downloading and executing other commands and continually communicating with the C2 server using encryption. 

Summary
Name Torii virus
Type Botnet/malware
Distribution Brute-force attacks
Spotted September 2018
Active since December 2017
Detection and elimination Use sophisticated anti-malware software
System repair  Use Reimage

Users might struggle to remove Torii virus since the malware is sophisticated. Moreover, detecting the cyber threat might be almost impossible unless the device is scanned with professional anti-malware software. We also suggest using Reimage to revert modifications performed by the virus.

Unlike banking trojan Emotet, Torii does not use malicious spam email attachments for its distribution. The infection starts when the virus breaks through weak Telnet credentials of the targeted device and uploads its primary script. At this point, the malware tries to identify the architectures used by the machine, which supports:

  • x86
  • x64
  • ARM
  • Motorola 
  • PPC 
  • SuperH
  • MIPS

Then, Torii botnet virus focuses on downloading and installing appropriate binary payloads – all of the downloaded files are in ELF format. In case the HTTP connection is not successful, the virus uses an FTP protocol that requires authentication, which is embedded inside the script. As soon as the first stage is complete, the dropper will execute the downloaded ELF file to ensure persistence. The executable on itself runs six different processes to ensure that the malware is running all the time.

Once the inner ELF file is executed, the second stage payload actively communicates with the Command and Control server using the encrypted XOR cipher. Torii virus then sends the following information to a remote server:

  • Hostname
  • Process ID
  • Path to second stage executable
  • MAC address
  • Device information, such as system name, version, release, etc.
  • Executes several other commands to get more information about the device

It is not clear how many devices in total are affected by Torii virus, but researchers claim that one of the malware used IPs was connected to 1,056,393 times. However, experts believe that the server used is only one of many used servers infecting more devices worldwide.

Torii botnet virus is a sophisticated malware which researchers never encountered before. It sends out a large amount of information to the C2 server and is also capable of communicating with it continually, which allows bad actors to execute virtually any script on the affected device. Additionally, the obfuscation level of this malware is advanced. Thus, to remove Torii virus, users need to detect if first, which might be not an easy task.

It is yet unclear what goal this IoT malware has, as it is not used for DDoS or crypto-mining. Researchers think that it might be created to serve as a backdoor for other malware. Nevertheless, with its impressive persistence and obfuscation techniques, a simple factory reset on a device will not perform Torii virus removal.

Use strong passwords for all your devices

Botnets are dangerous because they can be used for various malicious activities, such as DDoS attacks or cryptocurrency mining on the device. Therefore, avoiding such infections is a far better solution, as security experts[4] suggest. As we know, the malware spreads using brute-force attacks via poorly protected devices. Therefore, we recommend you use a strong password and never leave your connection unprotected, as virus infection can be imminent.

There are several ways to protect your connection. For example, using a combination of upper and lower case letters and numbers would provide better protection. While it is hard to remember, such passwords should be handled by password managing programs.

Additionally, users are not recommended using the same password for multiple accounts because, as soon as one account gets compromised, hackers might use that information for further attacks.

Eliminate Torii from your device

Currently, thousands or even millions of devices are at risk of malware infection. Therefore, those who already are infected should take care of Torii virus removal as soon as possible. On itself, it might be a complicated task, as malware does not show any signs or symptoms. Besides, it uses several persistence techniques to remain running on the affected device.

The only way to remove Torii botnet virus is by using sophisticated anti-malware solutions. Because the botnet is recently established, and it is still under the investigation. Therefore, not all AV engines might detect the malicious payload. For that reason, it is advisable to scan your devices using multiple security applications.

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Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Malwarebytes.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Torii virus, follow these steps:

Remove Torii using Safe Mode with Networking

To To remove Tori botnet effects on your machine, enter Safe Mode with Networking:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Torii

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Torii removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Torii using System Restore

Alternatively, you can use System Restore to eliminate the virus:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Torii. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Torii removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Torii and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes MalwarebytesCombo Cleaner or Plumbytes Anti-MalwareMalwarebytes Malwarebytes

About the author

Ugnius Kiguolis
Ugnius Kiguolis - The mastermind

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References