Viruses, worms, Trojans and all types of malware accumulate every week trying to infect computers and networks. The threats of cybersecurity are a constant, they use all kinds of techniques and they are getting more advanced. In addition, the era of mobility has increased the ways of hosting information and how to access it, adding billions of devices connected from mobile to IOT complicates the security scenario.
In this scenario and in addition to observing the due prudence (the preferred barrier against malware), it is convenient to have security solutions at hand to help in the task. As not all computers have security solutions installed and taking into account that not all types of malware can be combated once the operating system is started because they are loaded into the memory making it difficult to detect and eliminate them, using an external medium independent of the PC to analyze, capable of detecting and disinfecting malware and without the need for a permanent installation that ends up affecting their performance to some degree, is an ideal solution.
Today we remind you of some of these solutions, the way to create them and the use of some tools that should not be missing from your software arsenal.
Free antivirus to rescue Windows systems
All large security providers offer this type of solution. Most are based on Linux and are offered in “Live CD / USB” formats , created and bootable from optical drives, USB sticks or external drives. A list of the best available:
- Kaspersky Rescue Disk . Kaspersky has not updated the interface for a while, but its rescue disk based on Gentoo has the great power of the leader in consumer security solutions. You download the ISO image, you record it in a boot medium and use it.
- ESET SysRescue Live . ESET offers the download of an image to record but also offers the possibility of creating it directly on CD or USB. Interface perfectly updated and very easy to use.
- Bitdefender Rescue CD . Personally, I like them the most. It uses a Linux based on Xubuntu that allows greater possibilities besides virus elimination. Download the ISO from the link and burn in the middle.
- AVG Rescue CD . It offers two different images for creation on CD or USB. Its interface is quite spartan based on text but do not be scared, it fulfills its function, and like the rest, it previously updates the virus database to the latest available ones.
- Panda SafeDisk . Another that like Kaspersky has not been updated for a long time but that continues to fulfill its function. Very easy to use because it does not have too many customization options. It loads a wizard that automatically searches for the available antivirus definitions and, when you press start, it begins to scan the entire system in the search for malicious files.
- Trend Micro Rescue Disk . Very simple creation of the rescue medium at the click of your web page and with the option to choose CD / DVD or USB disk / pendrive. Its interface is the most spartan of the entire list, in a minimalist text mode with a few basic options.
- Norton Bootable Recovery Tool . Symantec offers the creation of the boot disk with a wizard that facilitates its creation without external applications once you have downloaded the tool. Once started with it, you will see a graphic but minimalist interface without personalization options, with two main options: scan and clean.
- Avira Rescue System . Ofrec download an image for creation of the medium. Graphical interface with few functions but simple to use. Like others we have seen simple interface, its power is in the search engine and disinfection and its ability to update the virus base, something that all do.
- F-Secure Rescue CD . Another of the simplest and at the time easy to use. With a Knoppix base, there is no real user interface except for a text-based dialog, where you will be asked if you want to start the analysis.
- Avast . It is the only one in the list that does not offer direct download of an image and the only way is to create the rescue disk from an Avast solution. The good thing is that it can be done from the free desktop version. The bad thing is that you have to install it first.
How these solutions are created
Some providers offer the possibility of creating the medium directly from their website and others simply offer an .ISO image that the user must record , either in an optical medium or on an external disk or USB pendrive.
Basically, it is as simple as opening the program, selecting the ISO image that we have downloaded and the application will be responsible for its creation. Some applications to use to record the images are:
You can use the one you prefer or the one advised by the provider. In all cases, the goal is to create a security tool capable of booting into our PC independently of the operating system installed to improve the search and disinfection of malware.
How do you use these free antivirus for rescue
Once the rescue medium is created, its use is simple. We restart the machine with the medium inserted in its location to start from it. If we have not done it before, we will have to enter the BIOS to place the optical drive or USB as the first boot media , always before the hard disk or SSD where we have installed the system.
The medium created is a “Live CD” format so we will not have to install anything on the hard drive or SSD of our team. Some solutions offer a visual environment and more functions, while others use a text mode completely dedicated to malware, understanding that the main thing is the power of your engine and the updates of your virus base , something that everyone does before scanning the system .
Some solutions are highly customizable, they allow to select scan and disinfection, boot sector, fast or full scan, files and folders of hard disks or external drives, access to the network, heuristic method and almost everything we can find in an installable antivirus .
Like any Linux, some include tools such as a browser to delete files manually or package managers in case we need to install any troubleshooting tool based on Linux, although its main use is the scanning and disinfection of viruses.
I said. They are a group of excellent tools that no user should miss because they allow to locate and disinfect malware in a simple way without touching the operating system. And if you keep the proper caution regarding security and use it as a regular maintenance task, you can save the installed antivirus.