By Bailey Marshall

Technique: Passive DNS (T1539)

In the intricate dance of cybersecurity, where attackers and defenders engage in a perpetual game of wits, the subtlety of Passive Reconnaissance takes center stage. Unlike its more overt counterpart, Active Scanning, Passive Reconnaissance involves gathering information without direct interaction with the target. It’s a silent, strategic dance where adversaries leverage subtle techniques to amass valuable intelligence.

The Art of Passive Reconnaissance: An In-Depth Exploration

Passive Reconnaissance is characterized by discretion, relying on techniques that leave minimal traces to the untrained eye. Within this phase, techniques such as DNS interrogation and monitoring publicly available information become the tools of choice for astute adversaries. In this digital ballet, understanding the nuances of Passive Reconnaissance is akin to decoding the secret language of cyber spies.

DNS Interrogation: Unveiling the Digital Landscape

One of the primary techniques within Passive Reconnaissance is DNS interrogation. Domain Name System (DNS) plays a pivotal role in translating human-readable domain names into IP addresses, making it a treasure trove of information for those with the know-how. By querying DNS records, attackers can glean insights into an organization’s digital infrastructure, potentially uncovering critical details that lay the groundwork for subsequent cyber exploits.

WHOIS Databases and DNS Enumeration: Tools of the Passive Reconnaissance Trade

Complementary to DNS interrogation are tools like WHOIS databases and DNS enumeration tools. WHOIS databases contain information about domain registrations, revealing details about the entities behind registered domains. On the other hand, DNS enumeration tools systematically extract information from DNS records, providing a comprehensive view of an organization’s digital footprint.

In the realm of MITRE ATT&CK, one specific technique that aligns with Passive Reconnaissance is Passive DNS (T1539). This technique involves the monitoring and collecting of DNS records over time, enabling attackers to build a historical profile of a target’s digital activities. It’s the cyber equivalent of observing footprints in the digital sand.

Command: dnsenum –enum target_domain

Additional Passive Reconnaissance Techniques and Tools:

WHOIS Lookup: A technique to gather information about domain registrations, including details about the registrant.

Command: whois target_domain

Shodan: A search engine that scans the Internet for open ports and provides information about connected devices.

Query: port:80 target_domain

 

Want to learn more? Check out PEN-200!