What are APTs?

What are APTs?

Advanced Persistent Threats (APT) are a long-term cyberattack strategy utilized by skilled threat actors. The origin of APTs can be traced back to the early 2000s when state-sponsored hackers and organized cybercrime syndicates began using highly targeted and persistent techniques to infiltrate and compromise the computer systems of government organizations, corporations, and critical infrastructure.

APTs typically involve a series of carefully orchestrated steps, including reconnaissance, initial compromise, privilege escalation, lateral movement, and data exfiltration. These attacks are characterized by their persistence, as threat actors work stealthily over extended periods, often months or even years, to achieve their objectives. The resources available to APT groups are also significant, given that they often have ties to nation-states, making their attacks even more formidable.

Notable APT groups like APT29 (Cozy Bear) and APT28 (Fancy Bear) are affiliated with Russian state interests, and APT1 is believed to be associated with the Chinese military. These groups have been responsible for high-profile cyber espionage campaigns. Over the years, APTs have evolved in sophistication, using advanced malware, zero-day vulnerabilities, and social engineering tactics to breach highly secure networks.

Advance Persistent Threats (APTs) Definition

An Advanced Persistent Threat (APT) is a highly sophisticated and targeted cyberattack conducted by well-resourced threat actors, often with a specific objective, such as espionage or data theft. APTs are characterized by their persistence, as they employ stealthy and long-term tactics to infiltrate and remain undetected within a target’s network for extended periods, sometimes spanning months or even years.

Stages of an APT Attack

The stages of an Advanced Persistent Threat (APT) attack typically include:


In this initial phase, threat actors gather information about the target organization. This involves researching the target’s infrastructure, employees, technologies, and vulnerabilities. The goal is to identify weaknesses that can be exploited.

Initial Compromise:

APT actors use various methods to gain an initial foothold in the target’s network. This can involve sending phishing emails, exploiting software vulnerabilities, or compromising a trusted third party with access to the target’s network.

Establishing Persistence:

Once inside the network, the attackers work to ensure their presence remains undetected for an extended period. They may install backdoors, rootkits, or other malware that can provide ongoing access and control.

Privilege Escalation:

APT actors seek to elevate their privileges within the network to access sensitive data and systems. This often involves exploiting vulnerabilities or using stolen credentials to gain higher-level access.

Lateral Movement:

With increased privileges, the attackers move laterally through the network, exploring and compromising additional systems and accounts. They may use legitimate administrative tools to blend in with regular network traffic.

Data Collection:

One primary objective of APT attacks is to gather valuable data, such as intellectual property, sensitive documents, or personal information. This data is often exfiltrated (taken out of the network) slowly and discreetly to avoid detection.

Maintaining Stealth:

Throughout the attack, APT actors take measures to remain undetected, often by using encryption, employing anti-forensic techniques, and monitoring security alerts to evade detection.


Once the desired data has been collected, it is exfiltrated from the target network to a location controlled by the attackers. This is typically done using covert channels or by blending exfiltration traffic with legitimate traffic.

Maintaining Anonymity:

After achieving their goals, APT actors erase or manipulate logs and other evidence of their presence to cover their tracks and maintain their anonymity.


In some cases, APT actors may maintain a presence in the compromised network even after achieving their initial objectives. This allows them to conduct further espionage, establish persistence for future attacks, or pivot to new targets within the same organization.

Understanding these stages is crucial for organizations to detect and mitigate APT attacks effectively. Proactive cybersecurity measures and cyber threat intelligence are essential for early detection and response to APT threats.

APT Characteristics

Advanced Persistent Threats (APTs) exhibit several key characteristics that distinguish them from typical cyberattacks:

Long-Term Persistence:

APTs are not quick, hit-and-run attacks. They persistently target a victim over an extended period, sometimes spanning months or years. This persistence allows attackers to operate stealthily and patiently, increasing their chances of achieving their objectives.

Highly Targeted:

APTs are specifically tailored to a particular victim or organization. Attackers conduct thorough reconnaissance to understand the target’s vulnerabilities, infrastructure, and personnel, enabling them to create customized attack strategies.

Stealth and Camouflage:

APT actors use advanced techniques to remain hidden within the victim’s network. They often blend in with legitimate traffic, avoid detection by security tools, and employ encryption and anti-forensic methods.

Nation-State or Well-Funded Groups:

APTs are typically associated with nation-state actors, state-sponsored groups, or well-funded cybercriminal organizations. They have the resources and expertise to execute complex and sustained attacks.

Multi-Stage Attacks:

APTs involve multiple stages, from initial reconnaissance to data exfiltration. Each stage is carefully planned and executed, with attackers adapting their tactics as needed to overcome obstacles.

Advanced Malware:

APTs frequently employ advanced and custom malware, which may include rootkits, remote access Trojans (RATs), and zero-day exploits. These tools are created with the ability to evade detection and maintain control over compromised systems.

Social Engineering:

APTs often rely on social engineering tactics, such as spear-phishing emails or baiting employees with enticing lures, to gain initial access to the target network.

Data Exfiltration:

Another key driver for APT groups is to gather valuable data of APTs is to steal sensitive data. Attackers carefully choose and exfiltrate valuable information, which can include intellectual property, trade secrets, financial data, or government secrets.

Exploiting Zero-Days:

APT actors frequently exploit zero-day vulnerabilities, which are previously unknown and unpatched software flaws. This gives them a significant advantage, as defenses may not be prepared to counter these attacks.


APT actors are highly adaptable. They continuously evolve their tactics, techniques, and procedures (TTPs) in response to security measures and intelligence about their activities.

Maintaining Anonymity:

After achieving their objectives, APT actors take steps to cover their tracks, erase evidence of their presence, and maintain their anonymity within the compromised network.

Understanding these characteristics is crucial for organizations and cybersecurity professionals to detect, respond to, and mitigate APT threats effectively.

Prime Targets of APT groups

Advanced Persistent Threats (APTs) primarily target the following types of organizations and entities:

Government Agencies:

APT groups often target government entities at the national, regional, or local levels. Their objectives may include stealing classified information, monitoring political developments, or gathering intelligence.

Large Corporations:

Major businesses across various industries, including technology, finance, healthcare, and defense, are attractive targets for APTs. Attackers seek to steal valuable intellectual property, financial data, and sensitive business information.

Defense and Military Organizations:

Military institutions and defense contractors are high-priority targets for APTs. These attacks focus on obtaining classified military data, weapon system specifications, and geopolitical intelligence.

Research and Development (R&D) Centers:

Organizations involved in cutting-edge research, such as universities, research institutions, and technology companies, are targeted for their innovative discoveries and proprietary technologies.

Critical Infrastructure Providers:

APTs may aim at critical infrastructure sectors like energy, transportation, and utilities. Disrupting these services can have widespread, devastating consequences.

Financial Institutions:

Banks and financial firms are targeted for their financial data, transaction records, and client information. APTs aim to exploit vulnerabilities to steal funds or conduct economic espionage.

Healthcare Providers:

With the digitization of medical records, healthcare organizations are targeted to access patient data, medical research, and healthcare technologies.

Aerospace and Aviation Industry:

APTs may infiltrate aerospace and aviation companies to gain access to sensitive information related to aircraft design, technology, and manufacturing processes.

Media and News Organizations:

Media outlets and news organizations may be targeted to gain insight into upcoming stories, influence public opinion, or disrupt news dissemination.

Supply Chain Targets:

APTs may compromise suppliers and third-party vendors that have access to their intended targets. By infiltrating the supply chain, attackers can indirectly access their primary objectives.

Non-Governmental Organizations (NGOs):

Some APTs target NGOs, particularly those involved in human rights advocacy, to monitor their activities, steal sensitive information, or undermine their work.

Political Campaigns:

APTs may target political campaigns, candidates, and political parties to access campaign strategies, voter data, and other confidential information.

Academic Institutions:

Universities and academic organizations are targeted for their research, scientific discoveries, and intellectual property.

Manufacturing and Industrial Firms:

APTs may infiltrate manufacturing and industrial organizations to gain insights into production processes, proprietary technologies, and manufacturing capabilities.

Think Tanks and Policy Organizations:

Think tanks and policy organizations may be targeted to access research and policy documents, gain insight into geopolitical strategies, or influence policy decisions.

International Organizations:

International bodies, such as the United Nations and other intergovernmental organizations, may be targeted for diplomatic, geopolitical, or economic information.

While these are common targets, APTs are adaptive and may adjust their focus based on evolving geopolitical, economic, and technological factors. Organizations in these sectors should prioritize robust cybersecurity measures to defend against APT attacks.

Examples of APT Groups

Here are a few examples of well-known Advanced Persistent Threat (APT) groups and their activities: 

APT29 (Cozy Bear):

APT29 is believed to be a Russian state-sponsored hacking group. They are notorious for their involvement in various high-profile cyber espionage campaigns. One of their most notable operations was the Democratic National Committee (DNC) email server breach during the 2016 U.S. presidential election.

APT28 (Fancy Bear):

Another Russian state-sponsored group, APT28, is known for its cyber-espionage activities. They have targeted government agencies, political organizations, and critical infrastructure worldwide. APT28 was linked to the hack of the World Anti-Doping Agency (WADA) and the Olympic Games organizations.

APT1 (Comment Crew):

APT1 is associated with the Chinese military and has been active for many years. They are known for cyber-espionage campaigns targeting a wide range of industries, including technology, defense, and healthcare. The group’s operations were exposed in a report by the cybersecurity firm Mandiant.

APT33 (Elfin):

APT33 is believed to be an Iranian cyber-espionage group. They have targeted organizations in the aerospace and energy sectors, particularly in the Middle East. Their activities include spear-phishing campaigns and malware attacks.

APT34 (OilRig):

Another Iranian APT group, APT34, has targeted organizations in the Middle East, particularly in the energy and telecommunications sectors. They have used tactics such as spear-phishing and malware to compromise their targets.

APT41 (Winnti Group):

APT41 is a Chinese APT group known for both state-sponsored cyber-espionage and financially motivated cybercrime activities. They have targeted gaming companies, healthcare organizations, and technology firms, among others.

APT-C-35 (Charming Kitten):

This Iranian APT group has targeted journalists, academics, and government officials. They are known for their use of spear-phishing emails and social engineering tactics.

APT40 (Periscope):

APT40 is believed to be a Chinese state-sponsored group that primarily targets maritime interests, including shipbuilding companies and naval technology research.

APT15 (Ke3chang):

APT15 is associated with Chinese state-sponsored cyber-espionage. They have targeted defense contractors, government agencies, and technology companies. Their activities were exposed in a report by the cybersecurity firm FireEye.

How to Secure yourself against APT Groups?

Protection against Advanced Persistent Threats (APTs) requires a multi-layered and proactive cybersecurity strategy. Here are key measures and best practices to defend against APTs:

User Training and Awareness:

Conduct regular cybersecurity training for employees to educate them about APTs and common attack vectors like phishing. Encourage a security-conscious culture where employees understand their role in preventing APTs.

Strong Authentication:

Implement Multi-Factor Authentication (MFA) to add an extra layer of security to user accounts. Enforce complex and regularly updated password policies.

Network Segmentation:

Segment your network to limit lateral movement for attackers. Isolate critical systems from less sensitive ones.

Vulnerability Management:

Regularly scan and patch systems and software to address known vulnerabilities that APTs might exploit. Keep all software and firmware up to date.

Access Control:

Limit user privileges based on the Principle of Least Privilege (PoLP). Users should only have access to what is necessary for their roles. Implement strong access controls and robust Identity and Access Management (IAM) solutions.

Intrusion Detection and Prevention:

The implementation of Intrusion Detection Systems and Intrusion Prevention Systems (IDS/IPS) for monitoring network traffic to check for suspicious activity. Set up alerts and automated responses to potential APT indicators.

Network Monitoring:

Continuously monitor network traffic and endpoints for unusual or unauthorized activity. Leverage Security Information and Event Management (SIEM) solutions to aggregate and analyze logs.

Endpoint Protection:

Deploy advanced endpoint protection solutions that can detect and block APT-related threats. Ensure that endpoint security software is regularly updated.

Email Security:

Implement robust email security solutions to filter out phishing and malicious attachments. Create a culture of cyberawareness so that employees can recognize and accordingly report suspicious emails to your infosec team.

Web Security:

Use web filtering and content inspection tools to block access to malicious websites and prevent drive-by downloads.

Secure Configuration:

Harden system configurations according to security best practices and industry standards.

Data Encryption:

Sensitive data should be encrypted, both at rest and during transit, to protect it from unauthorized access.

Incident Response Plan:

Develop and regularly update an incident response plan that outlines how to detect, respond to, and recover from APT incidents.

Threat Intelligence:

Subscribe to threat intelligence services to stay informed about the latest APT threats and tactics. Use threat intelligence to enhance your defenses and make informed decisions.

Red Team Exercises:

Conduct regular red team exercises or penetration testing to simulate APT attacks and identify vulnerabilities.

Vendor Security:

Ensure that third-party vendors and suppliers adhere to strict security standards, especially if they have access to your network.

Patch Management:

Develop a robust patch management process to ensure timely application of security patches.

Backup and Recovery:

Regularly back up critical data and systems. Test backups to ensure they can be quickly restored in case of an APT incident.

Regular Security Audits:

Conduct periodic security audits and assessments to identify weaknesses and gaps in your security posture.

Ensure compliance with relevant cybersecurity laws and regulations to avoid legal repercussions in case of a breach.

APTs are persistent and highly adaptive, making it essential to continuously evolve your cybersecurity defenses and stay vigilant to protect against these advanced threats. Collaboration with cybersecurity experts and sharing threat intelligence within the industry can also be valuable in enhancing your APT defense strategy.

APT Protection with Cyble

Cyble uses proprietary AI-powered technology to research the activities of APT groups in real time, providing users with actionable intel and insights into their capabilities, planned activities, and targets. This allows users to adapt their security policies accordingly, keeping them one step ahead of these groups and avoid becoming compromised by them. Cyble Vision can also track their conversations on darkweb cybercrime forums and marketplaces, giving users insights into where these groups may strike next, what vulnerabilities they may potentially exploit, and even potential collaborations between these groups when their interests/targets align.

To see how Cyble Vision can help your firm in a real-world scenario, feel free to reach out and schedule a demo with us at a time of your convenience.

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