Update README.md

README.md

@@ -30,6 +30,7 @@ A collection of essential resources related cyber threat intelligence theory
 | [Mandiant](https://www.mandiant.com/) | Mandiant's unprecedented report linking APT1 to China's 2nd Bureau of the People's Liberation Army (PLA) General Staff Department's (GSD) 3rd Department (Military Cover Designator 61398). | [mandiant-apt1-report.pdf](https://www.mandiant.com/resources/apt1-exposing-one-of-chinas-cyber-espionage-units) |
 | [CrowdStrike](https://www.crowdstrike.com/) | CrowdStrike's "breakout time" report provided an illuminating look at which actors operate the fastest within networks they have gained access to, and how effective and rapid the defenders have to be to defeat some of the most capable adversaries | [crowdstrike.com](https://www.crowdstrike.com/blog/first-ever-adversary-ranking-in-2019-global-threat-report-highlights-the-importance-of-speed/) | 
 | [Trevor Giffen](https://twitter.com/TrevorGiffen) | The Initial Access Broker Landscape | [curatedintel.org](https://www.curatedintel.org/2021/10/initial-access-broker-landscape.html) |
+| [Trevor Giffen](https://twitter.com/TrevorGiffen) | Assessing the State of Breached Data Search Services | [curatedintel.org](https://www.curatedintel.org/2021/03/assessing-state-of-breached-data-search.html) |
 | [William Thomas](https://twitter.com/BushidoToken) | Threat Group Naming Schemes In Cyber Threat Intelligence | [curatedintel.org](https://www.curatedintel.org/2022/05/threat-group-naming-schemes-in-cyber.html) |
 | [Sarah Jones](https://twitter.com/sj94356) | A Brief History of Attribution Mistakes - analyse the mistakes made by others so that you do not repeat them | [securityandtechnology.org](https://securityandtechnology.org/wp-content/uploads/2020/07/summit_archive_1548105619.pdf) |
 | [Anastasios Pingios](https://twitter.com/xorlgr) | Intelligence Agency and Security Services Internal Structuring | [xorl.wordpress.com](https://github.com/BushidoUK/Open-source-tools-for-CTI/blob/master/Adversary%20Intelligence.md#intelligence-agency-and-security-services-internal-structure) |