Whether you’re an IT professional or work in cybersecurity, it’s essential to understand the basics of malware. Learn more about the various types of malware, how they operate, and how hackers use them to target unsuspecting victims.
Malware is invasive software designed to infiltrate systems without the user’suser’s knowledge, stealing or damaging data and potentially disrupting critical infrastructure. It includes various tools, including viruses, trojans, worms, ransomware, and unauthorized spyware.
What is Malware?
Cybercriminals use malware to wreak havoc, steal data, hijack core computing functions, and more. This malicious software can be delivered in various ways, including USB drives, popular collaboration tools, and drive-by downloads.
Now, what is malware? Malware is software that infiltrates a device without permission, causes disruption, or steals information. It includes computer viruses, worms, spyware, ransomware, botnets, and trojan horses. Even programs like adware and PUPs (potentially unwanted applications) are malware, but only if they have malicious functionality or hidden features that make them unsafe.
Malware can also infect mobile devices and cause a host of problems, from corrupting data to stealing a user’suser’s personal information. The best way to prevent malware is to practice general security hygiene, keep systems up-to-date, and be cautious when opening email attachments or downloading files from the internet. Avoid websites that offer large amounts of free software or programs that seem suspicious, and always be wary when clicking on links in emails or text messages. Taking these precautions can significantly reduce your risk of infection.
Viruses
Viruses are microscopic infectious agents that can only reproduce by invading a living cell and stealing its resources. They contain DNA or RNA and are surrounded by a protein shell called a nucleocapsid. Viruses can infect all types of living cells and prokaryotes. They are responsible for many of the world’s most dangerous diseases, including smallpox, chicken pox, influenza, shingles, herpes, polio, rabies, AIDS, and cancer.
Unlike most malware, viruses don’tdon’t attack systems and data directly. They hide within files on your device or in your computer until they’re-they’re accessed, which triggers them to spread and do damage.
The first virus known to have been used for malicious purposes was Elk Cloner, which spread through infected floppy disks on Apple II systems in 1982. While this one was harmless, it fits the definition of malware as unwanted software and represented an invasion of privacy. Then came viruses, which paralyzed governments, hospitals, and large businesses around the globe in 2017. They’reThey’re considered the most significant ransomware attacks in history and caused an estimated ten billion in damage.
Trojans
Trojans hide malicious code in programs that appear to be harmless applications. Like the ancient Greek story of soldiers hidden in a hollowed-out wooden horse, Trojan malware can carry out a variety of harmful actions, including data theft, crashing devices, spying on activities, and even giving hackers control over a machine.
Trojan malware gets distributed through links and files sent in emails or piggybacking on free downloads from dubious sources. They can infect digital devices when users visit websites hosting such downloads. They can also be a part of a ” botnet,” a network of computers controlled by attackers that perform DDoS attacks, steal information or distribute spam.
Trojans include the gaming-thief Trojan, which targets gamers and attempts to steal passwords and sign-in details for online gaming platforms; the e-mail-finder Trojan, which harvests email contacts on an infected device; and the banking Trojan, which captures usernames, passwords, and financial account numbers. They can also include adware, which pushes unwanted ads on your screen or spies on your activity by collecting information and sending it back to the hacker.
Worms
Worms are self-propagating malware that spread between computers and devices on a network without human intervention. This makes them a much more dangerous threat than viruses, which require someone to open or run a compromised program.
Computer worms often exploit vulnerabilities in the operating system to spread. They can also contain “payloads” designed to do other damage, such as stealing information, deleting files, or causing massive denial of service attacks by overwhelming web servers with traffic.
If you suspect your computer is infected with a worm, you’ll likely notice it is slowing down or running out of storage space. You may also experience other unwanted activities, such as displaying annoying advertisements or asking for a ransom to unlock your files.
You can prevent worms by staying up to date with software updates, not clicking on suspicious links or attachments in emails, and avoiding file-sharing platforms that don’tdon’t require you to verify the source of downloads. In addition, enabling a firewall is critical to protecting your device against malware and other security risks. This will help close the gaps hackers use to infiltrate your systems and attack your networks.
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Ransomware
Once ransomware infiltrates a system, it encrypts the victim’svictim’s files. Upon completion, the malware displays a message explaining that the files have been locked and can only be restored with the victim paying a fee — often in cryptocurrency. Ransomware attacks are notoriously difficult to stop. However, staying up to date with patching and allowing listing software helps reduce the number of vulnerabilities attackers can exploit. Also, backing up files frequently and automatically can minimize the impact of an attack.
Cybercriminals can infect systems with ransomware through malicious attachments in phishing emails, infected applications, compromised websites, and Remote Desktop Protocol (RDP) attacks. They often target organizations that can afford to pay large sums of money and are more willing to keep the incident quiet. For example, they may target universities because they have smaller security teams and a diverse user base that does a lot of file sharing. Other targets include hospitals, law firms, and other organizations that hold sensitive information.