이메일 보안이란?

Email security refers to the practice of protecting email against potential cybersecurity threats. Phishing, account takeover, and other email-focused cyberattacks pose a significant risk to an organization, its employees, and corporate and customer data.

Email is a common target of cyberattacks due to its ubiquity and the relative ease of crafting a phishing campaign compared to other cyber threats. Protecting against the ever-evolving email threat requires advanced email security solutions.

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이메일 보안이란?

이메일 보안에 대한 일반적인 위협

이메일 보안에 대한 가장 큰 위협은 다음과 같습니다.

피싱

피싱 공격은 이메일 보안에 대한 가장 잘 알려진 일반적인 위협입니다. 피싱 공격은 형편없는 문법과 믿을 수 없는 구실로 유명한 나이지리아 프린스 스캠과 같은 공격으로 시작되었습니다. 시간이 지남에 따라 이러한 공격은 공격자가 더 그럴듯한 구실로 훨씬 더 세련된 이메일을 보내면서 더욱 정교해졌습니다.

The modern phishing attack can be general or targeted. These targeted attacks, also called spear phishing attacks, are highly researched and designed to trick a particular person or group.

비즈니스 이메일 침해(BEC)

One example of a common spear phishing attack is business email compromise (BEC). In a BEC attack, the target is tricked into sending sensitive data — or more commonly money — to the attacker. BEC attacks have become one of the most significant and expensive phishing attacks that companies face. According to the Internet Crime Complaint Center (IC3), BEC attacks between the years 2013 and 2022 caused an estimated loss of $50 billion.

멀웨어

Email is an ideal delivery mechanism for malware. Malware can be attached directly to an email or embedded in documents that are shared as attachments or via cloud-based storage. And once installed on a computer, malware may steal sensitive information or encrypt a user’s files.

데이터 손실

이메일 계정은 많은 민감한 정보에 액세스할 수 있습니다. 이메일을 통해 직접 전송되는 데이터 외에도 이러한 계정은 클라우드 기반 인프라 및 기타 온라인 서비스에 액세스하는 데에도 사용됩니다.

An attacker with access to these email accounts can gain access to all of this sensitive information, making email account credentials a common target of attack. Additionally, this information can be leaked by employees who accidentally include an unauthorized party on an email chain or fall for a phishing attack.

악성 링크

악성 링크는 사이버 범죄자가 이메일을 무기화하는 가장 일반적인 방법 중 일부입니다. 공격자는 이메일에 포함된 링크를 사용하여 수신자를 공격자가 제어하는 웹 페이지로 안내할 수 있습니다.

These phishing pages can be used for a variety of different purposes. Phishing pages can be designed to steal user credentials or deliver malware. Regardless, they can cause serious damage to an organization.

Account Takeover

In an account takeover (ATO) attack, a cybercriminal gains access to a user’s email or other online account. This is usually accomplished by stealing the user’s login credentials via phishing, credential stuffing, malware, or similar means.

Once an attacker has control over a user’s email account, they can abuse it in various ways. For example, the user’s email might be used in a spear phishing attack, to send out spam, or to gain access to other accounts by requesting password reset emails to be sent to the compromised account.

Spam

Spam is unwanted email sent out via mass mailers. Spam can be used for various purposes, ranging from marketing efforts by legitimate companies to attempts to infect the target computer with malware.

Quishing

Quishing is a form of phishing attack that uses QR codes. Emails will contain an image of a QR code, which, if scanned, will direct the user to a phishing site designed to harvest login credentials or infect their computer with malware.

Quishing attacks are designed to take advantage of the fact that a user is likely to scan the code presented in an email using the camera on their mobile device. Since personal smartphones are likely unmanaged by the company, this provides a means for the attacker to bypass the organization’s security controls.

Types of Email Security Services and Solutions

Companies can use various email security services and solutions to protect against phishing and other email-related threats. Some common types include:

  • Secure Email Gateways (SEG): SEGs are deployed at the perimeter of the corporate network to inspect and filter malicious emails. These tools use various criteria — such as malware signatures, URL filtering, and other phishing patterns — to identify and block malicious emails. These solutions may also incorporate antivirus protection, data loss prevention (DLP), and sandbox analysis of potentially malicious attachments.
  • Cloud Email Security: Cloud email security solutions such as Google Workspace or Microsoft 365 commonly have built-in security features. For example, the provider may offer threat protection, spam filtering, encryption, and other defenses.
  • Email Data Protection (EDP): EDP solutions are designed to protect against potential leaks of sensitive data and ensure compliance with data protection laws. EDP often uses encryption, DLP, and SEGs to achieve its function.
  • API-Based: API-based security solutions take advantage of the APIs provided by email solutions. These solutions use the access offered by APIs to inspect emails for malicious content and block potential phishing attacks without the need to be deployed in-line.

AI in Email Security

Recent developments in artificial intelligence (AI) have multiple potential impacts for email security, including:

  • Language Analysis: Large language models (LLMs) have the ability to read and analyze the content of an email. They can be used to identify potential warning signs of phishing attacks, such as attempts to create a sense of urgency or use psychological manipulation to get the target to do what the attacker wants.
  • Behavioral Analysis: AI is also well-suited to identifying patterns and trends in large volumes of data. This capability can be used for behavioral analysis, enabling email security tools to identify unusual email traffic that is indicative of a potential attack.

이메일 보안 서비스의 주요 기능

Email security services should provide protection against a wide range of email threats. Some key features of these solutions include the following:

  • Phishing Prevention: Phishing is the leading email security threat to the business. Email security solutions should use AI and ML to identify and block phishing emails before they reach an employee’s inbox.
  • Malware Detection: Phishing emails are commonly designed to deliver malware via malicious links and attachments. Email security services should offer sandboxed, signature, and heuristic analysis to identify malware in emails.
  • Email Encryption: Encryption helps to protect sensitive data from exposure by rendering emails unreadable to eavesdroppers. This helps to reduce the risk of data breaches and unauthorized access to email data.
  • Data Loss Prevention (DLP): Email can be used to send sensitive information to unauthorized parties. DLP solutions identify sensitive content in an email and block it from being leaked.
  • Spam Filtering: Unwanted spam emails are sent out in massive volumes, wasting storage capacity and network bandwidth. Email security solutions should be able to identify and filter spam before it reaches the user’s inbox.
  • Regulatory Compliance: Email can be a significant threat to regulatory compliance due to the potential for data breaches. Email security solutions should offer built-in support for implementing regulatory data protection requirements.
  • Email Authentication: Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication and security protocol designed to protect against phishing and other email-based attacks. If domain owners enable DMARC, it can prevent phishers from spoofing email addresses from their domain. DMARC specifies how to handle emails that fail verification. It uses two main protocols to verify the authenticity of an email:
  • Sender Policy Framework (SPF): SPF authenticates emails based on the IP address of the sender. The owner of a domain can add a list of IP addresses authorized to send emails from that domain to their DNS record. The recipients of emails can then check to verify that the source of the email is an authorized IP address for that domain.
  • DomainKeys Identified Mail (DKIM): DKIM uses digital signatures to authenticate emails. Domain owners can include DKIM public keys in their DNS records and digitally sign their email messages. Recipients can use the provided public key to validate the signature and verify the authenticity of the email.

이메일을 보호하는 7가지 방법

이메일은 쉽고 효과적이기 때문에 사이버 범죄자들이 가장 일반적으로 사용하는 공격 벡터 중 하나입니다. 조직과 직원이 다음과 같은 이메일 보안 모범 사례를 따르는 경우 이러한 공격으로부터 보호하는 것도 간단할 수 있습니다.

  1. 강력한 암호 사용: 취약하고, 재사용되고, 유출된 비밀번호는 이메일 계정 손상의 가장 일반적인 원인입니다. 강력하고 고유한 암호를 사용하는 것은 이메일 계정의 보안에 필수적입니다.
  2. 다중 인증(MFA)을 켭니다. 공격자가 사용자의 이메일 자격 증명에 대한 액세스 권한을 얻으면 손상된 계정이 다양한 공격에 사용될 수 있습니다. MFA를 켜면 공격자가 사용자의 암호 이상의 것이 필요하기 때문에 이메일 계정 탈취를 수행하기가 더 어려워집니다.
  3. 데이터 유출 방지 (DLP) 솔루션 배포: 민감한 데이터는 의도적이든 의도적이지 않든 이메일을 통해 유출될 수 있습니다. DLP 솔루션은 잠재적인 데이터 유출의 징후를 식별하고 침해가 발생하기 전에 차단하는 데 도움이 될 수 있습니다.
  4. 피싱 이메일 필터링 구현: 많은 이메일 제공업체가 피싱 콘텐츠를 필터링하려고 시도하지만 일부 공격은 빠져나갈 수 있습니다. 피싱 콘텐츠를 검사하고 필터링하는 솔루션을 배포하면 이러한 이메일이 직원의 받은 편지함에 도달하는 것을 방지하는 데 도움이 될 수 있습니다.
  5. 악성 첨부 파일 검사: 첨부 파일은 피싱 이메일이 대상에게 멀웨어를 전달하는 일반적인 방법입니다. 이메일에서 의심스럽거나 악의적인 첨부파일을 검사하면 이러한 첨부파일이 사용자의 받은 편지함에 도달하여 컴퓨터를 감염시키기 전에 식별하여 이메일에서 제거할 수 있습니다.
  6. 직원 교육: 피싱 공격은 사용자가 링크를 클릭하거나 악성 첨부 파일을 열도록 속여 사용자를 이용하도록 설계되었습니다. 직원 사이버 인식 교육 은 직원이 악성 이메일을 식별하고 적절하게 대응하여 공격 성공 가능성을 줄이는 데 도움이 될 수 있습니다.
  7. 빈번한 보안 모니터링을 수행합니다. 사이버 위협 환경은 끊임없이 진화하고 있으며 사이버 범죄자는 새로운 공격 방법을 개발하거나 이메일을 사용하여 조직을 상대로 새로운 캠페인을 시작할 수 있습니다. 새로운 위협을 나타낼 수 있는 이상 징후에 대한 이메일 트래픽 모니터링은 이러한 공격을 탐지하고 대응하는 데 중요할 수 있습니다.

체크 포인트를 사용한 Email Security

Cybercriminals understand how vital email is to modern business, making an email security solution capable of detecting phishing, data loss, and other email-related threats, an absolute necessity.

Check Point Harmony Email & Collaboration provides state-of-the-art protection against common and emerging email threats. To learn more about its capabilities, request a demo. You’re also welcome to try it out for yourself with a free trial.

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