Top 20 Different Types Of Cyberattacks In Cybersecurity

Different Types Of Cyberattacks

Cyberattacks are growing in scale and sophistication each year, making it crucial for information security teams to understand the most common vectors threat actors leverage to infiltrate networks and systems. This overview analyzes different types of cyberattacks through examples, impacts, and countermeasures so security professionals can make informed decisions.

Before diving into the different types of cyberattacks, let’s quickly define what constitutes a cyberattack. A cyberattack refers to any unauthorized attempt to access, manipulate, damage, disable, steal, or gain control over computer systems, networks, devices, or essential infrastructure. Cyberattacks use various techniques to undermine the confidentiality, integrity, or availability of data and systems.

Attackers may include cybercriminals, state-sponsored groups, hacktivists, insiders, and even those with no malicious intent but who inadvertently expose assets to risk. Their goals vary from financial gain, business disruption, data theft, and system destruction to political, social, or personal motivations.

Understanding prevalent cyber attack vectors grants visibility into vulnerabilities threat actors continuously target. This knowledge ultimately allows for more strategic security planning and robust defenses.

Here are the top 20 different types of cyberattacks through categories, examples, impacts, and countermeasures so security professionals can make informed decisions.

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1. Denial of Service (DoS) and Distributed Denial of Service (DDoS)

Denial of Service (DoS) attacks aim to make a computing or network resource unavailable to legitimate users by overloading it with malicious traffic. Distributed Denial of Service (DDoS) attacks amplify this effect by using multiple compromised sources to flood the target. During a DoS attack, bogus requests overwhelm the victim resource, whether it be a website, web application, DNS server, or other network component. This disrupts normal function, causing performance issues or complete unavailability. DDoS attacks compound this by flooding the target from widely distributed botnets of infected devices.

Key defenses include having adequate bandwidth to absorb some volume spikes. DDoS mitigation services like Cloudflare DDoS protection reroute and filter out malicious traffic before it reaches you. Rate limiting and protocol scrubbing also assist in blocking resource exhaustion attempts.

2. Man-in-the-Middle (MITM) Attacks

The goal of man-in-the-middle (MITM) attacks is to covertly eavesdrop or intercept communications between two parties by inserting another node between them. This allows the attacker to listen in, record, and even alter exchanged data. MITM attacks may target WiFi users on open and weakly encrypted networks. Websites and web applications lacking HTTPS encryption are also susceptible when users access them through public networks. Network infrastructure like compromised routers enables large-scale MITM attacks.

Once situated between victims, MITM attacks open various possibilities for data theft, such as stealing account credentials, intellectual property, and personal info. Attackers may also inject malicious code or fake responses into intercepted traffic flows.

Encryption of network traffic and the use of VPNs prevents MITM eavesdropping and tampering. HTTPS websites ensure data exchange can’t be spied on or altered. Proper WiFi security controls and router hardening protect infrastructure from takeover.

3. Phishing Attacks

The Phishing refers to social engineering schemes that use spoofed emails, text messages, websites, and more to trick users into disclosing credentials, installing malware, or transferring funds. Phishing leverages confidence tricks to manipulate human psychology and lure victims. These scams have become increasingly sophisticated, using personal details to appear legitimate. Clever social engineering convinces users that messages come from trusted sources. Phishing targets include login credentials, credit card data, sensitive docs, and even initial access avenues into corporate networks.

User security training is vital to combat phishing, teaching employees to scrutinize messages and sender details. Technical controls like spam filtering, URL reputation checks, DMARC, and antivirus add layers of protection against phishing content slipping through.

4. Whaling Attacks

Whaling refers to phishing attempts targeting high-profile victims like corporate executives, aiming to compromise accounts with extensive privileges to data and systems. Also known as “spear phishing”, these are precision strikes requiring research into targets. By obtaining access to C-suite level accounts, whaling attacks enable extensive data exfiltration, wire fraud, installation of backdoors, and other internal exploitation. The impacts of compromised executive credentials can be severe.

In addition to general phishing defenses, whaling requires security awareness training tailored to executives prone to being targeted. Strict limits and oversight on C-suite permissions also confine damage from potential credential theft. Transaction approval chains for wire transfers increase financial security.

5. Spear Phishing Attacks

Spear phishing refers to phishing campaigns focused on specific organizations or individuals rather than mass targeting. Tailored content referencing names, interests, and other personal details boosts the credibility of spear phishing messages. These attacks also commonly leverage email spoofing, hiding the true sender address behind a display name matching trusted entities associated with the victim. The goal is to urgently persuade recipients to click links or attachments containing malware or revealing login credentials.

The same technical phishing protections apply; however, user training should cover spear phishing tactics as well. More advanced phishing platforms can simulate highly realistic spear phishing scenarios to boost employee detection rates.

6. Ransomware Attacks

Ransomware is a form of malware that locks systems and encrypts files, demanding ransom payment from victims in return for restoring access. Widespread ransomware families include Ryuk, REvil, Conti, and many others in constant evolution. Ransomware leverages various initial infection vectors like phishing and drive-by downloads. Network propagation allows it to spread across multiple systems quickly and shared drives within organizations via built-in worm-like features. The impact is potentially massive business disruption and data loss.

Multi-layered ransomware defenses are required, spanning training, least privilege access, patching, hardening, backups, anomaly detection, email security, and next-gen anti-virus. Promptly applying patches and hardening internet-facing systems reduces vulnerabilities targeted by ransomware.

7. Password Attacks

Password attacks aim to crack account credentials through methods like brute forcing, which tries all possible password combinations. Dictionary attacks instead attempt passwords from predetermined word and phrase lists. Once successful, access allows attackers to breach networks, exfiltrate data, distribute malware, and pivot to other systems. Weak and default passwords make organizations highly susceptible to credential stuffing and password-spraying campaigns.

Strong password policies requiring complexity and frequent rotation defend against guessing and reuse. Multi-factor authentication adds another layer of identity verification not compromised by password theft alone. Monitoring logins for suspicious IP origins, volumes, and timestamps also helps detect attacks.

8. SQL Injection (SQLi) Attacks

SQL injection or SQLi refers to inserting malicious SQL code into application queries and commands that get executed by the database. By manipulating inputs rather than using proper sanitization, attackers can potentially access, modify, or destroy sensitive data. Successful SQLi can enable data loss, record tampering, privilege escalation, host OS command execution, and more. Quickly dumping and exfiltrating the entire contents of databases is also possible. SQLi remains one of the most common and high-risk web application vulnerabilities.

Input validation and avoiding concatenating raw user inputs into SQL statements will close SQLi entry points. Sandboxing queries, using prepared statements, whitelisting allowable inputs, query parameterization, and WAFs also assist in neutralizing SQLi attacks.

9. URL Manipulation Attacks

This attack type aims to manipulate website address parameters and values to access unauthorized functionality or data. Attackers tweak URL syntax to uncover hidden pages, modify server-side values, grab info leakage in error messages, and more. For example, changing an account ID in a URL may provide another user’s private data. Input passed in URLs is often insecurely handled, enabling many forms of exploitation.

Key countermeasures include avoiding reliance on obscurity for sensitive functions and validating user input parsed from URLs. Display generic error pages rather than detailed ones revealing backend weaknesses. Web application firewalls additionally help block suspicious parameter manipulation.

10. DNS Spoofing/Poisoning Attacks

Domain name system (DNS) spoofing or poisoning tampers with DNS data to redirect user traffic to malicious sites controlled by the attacker through domain impersonation. This enables phishing and malware installation via users unknowingly visiting fake pages. By compromising

DNS records or servers through vulnerabilities or configuration errors, attackers transparently reroute victims elsewhere. DNS spoofing also facilitates denial of service when users are directed to nonexistent domains.

Hardening DNS infrastructure and servers thwarts takeover and tampering. DNSSEC validation defeats spoofing by cryptographically signing records. Alternative encrypted DNS protocols like DNS over HTTPS (DoH) also avoid manipulation. Monitoring DNS traffic helps spot anomalies and filtering outbound TCP/UDP port 53 hinders some tunneling.

11. Session Hijacking Attacks

Session hijacking refers to stealing a user’s valid session ID cookie to gain unauthorized access to their web accounts. Rather than authenticate normally, hijackers leverage and mimic an existing active session of a victim. Common session hijacking vectors include XSS attacks stealing session cookies, usage of malware like keyloggers to capture session IDs, and prediction of valid IDs through techniques like brute forcing. The impacts include account takeovers, data exfiltration, and injection of malicious commands.

Session ID complexity and frequently forced re-generation make prediction difficult. The HttpOnly cookie flag prevents client-side JavaScript access. Invalidating inactive sessions after timeouts close windows of opportunity. HTTPS encryption protects IDs against interception via MITM attacks.

12. Brute Force Attacks

Brute force attacks aim to crack passwords or encryption keys by automatically trying all possible combinations until successful. The guessing is performed quickly at scale using tools leveraging bots and compromised machines. Common protocols attacked include SSH, FTP, HTTP, and others using username and password authentication. The scope and speed of automated guessing make weak passwords extremely risky. Successful credential theft enables system access and data theft.

Account lockout policies after a set number of failed attempts deter brute forcing. Password complexity requirements also exponentially increase the time needed to guess passwords. Rate-limiting login attempts help prevent scaling brute force retries. Multifactor authentication adds a layer not vulnerable to password guessing.

13. Web Application Attacks

Web application attacks target vulnerabilities in custom web apps and APIs to steal data, take over accounts, execute malicious code, and more. Common vectors include injection flaws, authentication weaknesses, sensitive data exposure, misconfigurations, etc. The widespread reliance on web apps for banking, email, e-commerce, and other functions makes them prime targets. Flaws like SQLi and XSS enable major data breaches.

Secure development practices and testing help eliminate many vulnerabilities proactively before deployment. A combination of input validation, patching, hardening, rate limiting, WAF rules, API security, and threat monitoring defend against various web app attack vectors. Performing vulnerability scans and penetration tests also identifies weaknesses to address. Enforcing least-privilege access is another best practice.

14. Insider Threats

Insider threats refer to risks stemming from employees, vendors, contractors, and others with internal access intentionally abusing entrusted permissions for malicious purposes. These Insider threats are especially dangerous given their authorized access to assets. Malicious insider actions may include IP theft, data exfiltration, tampering, sabotage, harassment, and intentional security policy violations. However accidental insider threats like falling for phishing or misconfigurations also pose substantial risk.

Stringent background screening and access controls reduce insider threat capabilities. Monitoring privileged user activity detects potential anomalies and misuse. Promptly disabling ex-employee credentials secures access. Data loss prevention (DLP) solutions also protect against unauthorized use and transmission of sensitive data.

15. Trojan Horse Attacks

Trojan horses or Trojans are malicious files concealed within legitimate downloads like games, cracks, or keygens. Once installed, Trojans create backdoors for remote access, enable spying through keyloggers, initiate ransomware, and allow attackers to control infected systems. Social engineering tricks users into actively installing Trojans themselves, unlike many other malware delivery methods. Trojan capabilities include credential harvesting, DDoS participation, data destruction, and crypto-jacking. Remote access Trojans (RATs) pose a particular risk as they are designed to enable complete system control.

Anti-virus and anti-malware detects and blocks known Trojans, while whitelisting prevents unknown binaries from executing. Hardening systems and patching software close avenues for exploitation that Trojans rely on for deployment. Users should also avoid pirated software, key generators, and other unauthorized download sources.

16. Drive-By Download Attacks

Drive-by downloads refer to automatically downloading and installing malware onto a system simply by visiting a compromised website. Exploit kits targeting browser flaws allow malware execution often without any action needed by the user. Once initiated through exploits or malicious ads, drive-by downloads install backdoors, spyware, keyloggers, remote access Trojans, info stealers, and other threats. Drive-by downloads provide easy infection vectors to pursue targets, requiring only that they visit a site.

Keeping browsers, plugins, and system software patched eliminates many exploit vulnerabilities leveraged for drive-by downloads. Disable auto-running of executables from downloads. Antivirus and anti-malware also detect and block malware installs resulting from drive-bys.

17. Cross-Site Scripting (XSS) Attacks

Cross-site scripting or XSS involves injecting malicious scripts like JavaScript into vulnerable sites and applications. When executed in a victim’s browser, these malicious scripts enable attackers to steal cookies, credentials, sensitive data, and more. XSS attacks rank as one of the most common and dangerous website vulnerabilities. The scripts even enable actions like account takeover and interface defacement. Reflected and stored XSS variants exist depending on the injection source location.

Input validation and output encoding of untrusted data prevent XSS attacks targeting entry points like search bars, inputs, and URLs. Content Security Policy (CSP) restricts browser script execution to trusted sources only. The HttpOnly cookie flag also prevents access to session cookies.

18. Eavesdropping Attacks

Eavesdropping refers to the interception and monitoring of communications by unauthorized parties, allowing sensitive info like credentials, trade secrets, IP, and personal details to be stolen. Network traffic, unencrypted WiFi, and improperly secured telephony are vulnerable channels. Once access to transmit flows is gained, confidential conversations and transmitted data become exposed. Both external and internal threats may perform eavesdropping, whether via full traffic captures or selective monitoring of interesting data flows.

Encryption of network traffic and stored data ensures interception results only in unreadable ciphers. Properly secured VPN and SSH connections provide encrypted tunnels. Physical security controls like Faraday cages and white noise generators also help prevent monitoring.

19. Cryptographic Hash Collision Attacks

Cryptographic hash collisions involve finding two inputs that generate the same hash value. Hash algorithms are used to verify data integrity and authenticity in applications like digital signatures and blockchain transactions. Although hashes appear unique, mathematical weaknesses allow collisions. By repeatedly hashing values, attackers can find colliding inputs. Applied to blockchains, this allows double-spending assets using duplicated signatures referencing the same hash.

Longer hash lengths significantly reduce collision probability. Transitioning to more secure hashing algorithms like SHA-256 deters this vector. Upgrading blockchain consensus mechanisms also mitigates associatedd risks.

20. Malware Attacks

A Malware is an umbrella term for various forms of malicious code and software like spyware, viruses, worms, Trojans, ransomware, and more. Malware attacks have goals ranging from data and credential theft to encrypting files for ransom to scraping computing power for cryptojacking. Spreading through websites, downloads, and phishing links, malware leverages social engineering and software exploits to initiate infections. Once present, malware can evade detection using stealthy techniques while continuing to operate via privileged commands and network callouts.

Anti-virus, system hardening, patching, application whitelisting, access controls, and backups all assist in combating various malware threats. However, user security awareness regarding downloads and links remains crucial in preventing initial infection vectors.

Key Takeaways on different types of cyberattacks

Reviewing the most common cyberattack categories and methods reveals key takeaways:

  • Long-standing attack vectors like phishing and SQLi remain prevalent because they target vulnerable human and software factors.
  • Ransomware stands out for the scale of potential business disruption, while web app threats raise confidential data loss concerns.
  • Commodity malware and exploits pose everyday risks, hence the need for patching, antivirus, and system hardening.
  • MitM, session hijacking, and eavesdropping highlight the ongoing importance of traffic encryption and VPNs.
  • Insider threats remain impactful given the privilege abuse vector. Controls like DLP safeguard sensitive data usage.
  • Brute forcing underscores strong password policies and MFA adoption for account security.
  • DDoS and XSS attacks illustrate technical protections like scrubbing services and request validation.

Overall, this analysis shows that threats are diverse, constantly evolving, and often blend multiple techniques for greater effectiveness. Understanding the most salient attack types allows organizations to implement layered defenses spanning security basics, technical controls, and employee training.

FAQs about different types of cyberattacks:

What are the most common initial vectors for compromising corporate networks?

Phishing, both broad campaigns and spear phishing, remains one of the top vectors for breaching business networks. Ransomware infections, drive-by downloads, and third-party vendor risks are other common avenues that threat actors leverage.

What categories of cyber attacks are most likely to result in data breaches?

Web application attacks like SQLi, and XSS enable data theft by manipulating site behaviors. Insider threats, credential theft via phishing or brute forcing, and malware like Trojans can also directly facilitate confidential data exfiltration.

What are top cyber attack types that disrupt IT and business system availability?

Denial of service (DoS/DDoS), ransomware and malware like wipers and sabotage programs directly impact system and resource availability by overloading, encrypting, or deleting key assets. Physical attacks like cable cuts also diminish availability.

What are the most common financial motivations behind cyber attacks on businesses?

Ransomware attacks aim to extort money directly from victims by encrypting systems. Wire transfer and financial fraud via compromised executive accounts is also lucrative. Stolen data and credentials can also be sold in dark web marketplaces.


This overview provided a detailed examination of today’s most significant types of cyberattacks that enterprises need to be aware of and develop defenses against. While threats are diverse and constantly evolving, maintaining strong security fundamentals in areas like access controls, encryption, training, patching and system hardening provides a foundation for mitigating risks. Understanding the attack landscape also allows for more focused threat modeling, intelligence and safeguards tailored to organization-specific risks and vulnerabilities.

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