An advanced persistent threat (APT) is a cyberattack in which an intruder infiltrates a network to steal sensitive data over an extended period. APT attacks are carefully planned and designed to evade existing security measures and fly under the radar. Organizations can implement security measures and mitigate the risks posed by advanced persistent threats by recognizing the stages of infiltration, escalation, and exfiltration.
See more: What is an advanced persistent threat (APT)?
Stages of an APT attack:
Infiltration
The first phase of an APT attack involves gaining unauthorized access to a network. Attackers often employ social engineering techniques, such as spear-phishing emails, to target high-level individuals within an organization. These emails are carefully crafted to appear legitimate, often referencing ongoing projects or coming from trusted team members.
Escalation and lateral movement
Once inside the network, the attackers expand their access and gather critical information. They may deploy malware to move laterally across the network, mapping its structure and obtaining credentials such as account names and passwords. This enables them to access valuable business data and establish backdoors for future stealth operations.
Exfiltration
In the final stage of an APT attack, cybercriminals extract the stolen information from the compromised network without detection. They typically store the data in a secure location within the network until they have collected enough to make the exfiltration worthwhile. To distract security teams and tie up network resources, attackers may launch denial-of-service (DoS) attacks or other diversionary tactics.
Characteristics of an APT attack
APT attacks differ from traditional cyberattacks in their sophistication and persistence. They often leave behind unique signs that organizations should watch for:
- Unusual activity on user accounts, such as high-level logins late at night.
- The presence of backdoor Trojans throughout the network.
- Unexpected or abnormal data bundles indicating data accumulation for exfiltration.
- Abnormalities in outbound data flows or sudden increases in database operations involving large volumes of data.
Protecting against APT attacks
To defend against APT attacks, organizations must adopt a multi-layered approach to cybersecurity. Here are some effective tactics to employ:
Sensor coverage
Deploy capabilities that provide comprehensive visibility across the network to avoid blind spots that could serve as havens for cyber threats.
Technical intelligence
Leverage indicators of compromise (IOCs) to enrich security information and event management (SIEM) systems. This helps in event correlation and detection of potential threats.
Service provider partnership
Collaborate with a reputable cybersecurity firm to access expertise and assistance in responding to sophisticated cyber threats.
Web application firewall (WAF)
Employ a WAF to filter, monitor, and analyze web traffic at the application level, protecting against malicious HTTP and HTTPS requests.
Threat intelligence
Utilize threat intelligence to profile threat actors, track campaigns, and identify emerging malware families. Contextual understanding of attacks is crucial for effective defense.
Threat Hunting:
Consider 24/7 managed threat-hunting services to complement existing cybersecurity measures. Human-based threat hunting can provide valuable insights and uncover hidden threats.
Go deeper: How to manage persistent threats and zero-day vulnerabilities
Notable Examples of APTs
- Cozy Bear (APT29): Assessed to be acting on behalf of the Russian Foreign Intelligence Service, Cozy Bear targets political, scientific, and national security entities through spear-phishing campaigns and the distribution of various malware types.
- Ocean Buffalo (APT32): This Vietnam-based adversary has been active since at least 2012. They utilize many tactics, such as strategic web compromise (SWC) operations and spear-phishing emails, to distribute malware and infiltrate targeted organizations.
- Wicked Panda (APT41): Operating out of China, Wicked Panda is known for its sophisticated and prolific cyber activities. It consists of several groups working in the interests of the Chinese state while carrying out criminal activities for profit.
Secure email and APT
Secure email solutions can play a significant role in mitigating the threat of spear-phishing attacks. Secure email solutions can protect sensitive information and prevent unauthorized access by employing encryption, authentication, and other security measures.
Read also: HIPAA Compliant Email: The Definitive Guide
Farah Amod
