词条 | Cyber threat hunting |
释义 |
MethodologiesThreat hunting has traditionally been a manual process, in which a security analyst sifts through various data information using their own knowledge and familiarity with the network to create hypotheses about potential threats, such as, but not limited to, Lateral Movement by Threat Actors.[3] To be even more effective and efficient, however, threat hunting can be partially automated, or machine-assisted, as well. In this case, the analyst uses software that leverages machine learning and user and entity behavior analytics (UEBA) to inform the analyst of potential risks. The analyst then investigates these potential risks, tracking suspicious behavior in the network. Thus hunting is an iterative process, meaning that it must be continuously carried out in a loop, beginning with a hypothesis. The hypothesis can focus efforts on known exploits, potential bad actors or assets and data of value. Using security data, industry reports and other intelligence, the hypothesis is formed, and the hunt team sets out to prove or disprove its validity. Cyber threat hunts often employ both automated and manual tools and techniques to identify a compromise before it is detected.[4] There are three types of hypotheses:
The analyst researches their hypothesis by going through vast amounts of data about the network. The results are then stored so that they can be used to improve the automated portion of the detection system and to serve as a foundation for future hypotheses. The Detection Maturity Level (DML) model [6] expresses threat indicators can be detected at different semantic levels. High semantic indicators such as goal and strategy, or tactics, techniques and procedure (TTP) are more valuable to identify than low semantic indicators such as network artifacts and atomic indicators such as IP addresses. SIEM tools typically only provide indicators at relatively low semantic levels. There is therefore a need to develop SIEM tools that can provide threat indicators at higher semantic levels.[7] Cyber threat hunting providersRepresentative notable vendors of threat hunting software and services include:
The SANS Institute has conducted research and surveys on the effectiveness of threat hunting to track and disrupt cyber adversaries as early in their process as possible. According to a survey released in 2017, "60% of those who hunt for threats reported measurable improvements in their InfoSec programs based on their hunting efforts, and 91% report improvements in speed and accuracy of response."[8] IndicatorsThere are two types of indicators: 1) Indicator of Compromise - An indicator of compromise (IOC) tells you that an action has happened and you are in a reactive mode. This type of IOC is could by looking inward at your own data from transaction logs and or SIEM data. Examples of IOC include unusual network traffic, unusual privileged user account activity, login anomalies, increases in database read volumes, suspicious registry or system file changes, unusual DNS requests and Web traffic showing non-human behavior. These types of unusual activities allow security administration teams to spot malicious actors earlier in the cyberattack process. 2) Indicator of Concern - Using Open-Source intelligence (OSINT), data can be collected from publicly available sources to be used for cyberattack detection and threat hunting. Tactics, Techniques and Procedures (TTPs)The SANS Institute identifies a threat hunting maturity model as follows:[9]
Dwell TimeCyberattackers operate undetected for an average of 99 days, but obtain administrator credentials in less than three days, according to the Mandiant M-Trends Report.[10] The study also showed that 53% of attacks are discovered only after notification from an external party. Mean Time to DetectionThe average company takes 170 days to detect an advanced threat, 39 days to mitigate, and 43 days to recover, according to the Ponemon Institute.[11] See also
References1. ^{{Cite web|url=http://www.techrepublic.com/article/cyber-threat-hunting-why-this-active-strategy-gives-analysts-an-edge/|title=Cyber threat hunting: How this vulnerability detection strategy gives analysts an edge - TechRepublic|website=TechRepublic|access-date=2016-06-07}} 2. ^{{Cite web|url=https://www.techworm.net/2018/06/threat-intelligence-platform-on-war-against-cybercriminals.html |title=Threat Intelligence Platform on War Against Cybercriminals |access-date=2019-02-17}} 3. ^{{Cite news|url=https://expel.io/blog/what-is-cyber-threat-hunting-and-where-do-you-start/|title=What is (cyber) threat hunting and where do you start? - Expel|date=2018-04-09|work=Expel|access-date=2018-05-26|language=en-US}} 4. ^{{Cite news|url=https://talatek.com/risk-management-services/cyber-threat-hunting/|title=TalaTek Cyber Threat Hunting Services|last=Alsinawi|first=Baan|work=TalaTek, LLC|access-date=2018-11-12|language=en-US}} 5. ^1 2 {{Cite web|url=https://sqrrl.com/solutions/cyber-threat-hunting/|title=Cyber Threat Hunting - Sqrrl|website=Sqrrl|language=en-US|access-date=2016-06-07}} 6. ^{{Cite web|url=http://ryanstillions.blogspot.no/2014/04/the-dml-model_21.html|title=The DML Model|last=Stillions|first=Ryan|date=2014|website=Ryan Stillions security blog|publisher=Ryan Stillions|access-date=}} 7. ^{{Cite web|url=http://folk.uio.no/josang/papers/BJE2016-STIDS.pdf|title=Semantic Cyberthreat Modelling|last=Bromander|first=Siri|date=2016|website=|publisher=Semantic Technology for Intelligence, Defense and Security (STIDS 2016)|access-date=}} 8. ^{{Cite web|url=https://www.sans.org/reading-room/whitepapers/analyst/hunter-strikes-back-2017-threat-hunting-survey-37760|title=The Hunter Strikes Back: The SANS 2017 Threat Hunting Survey|date=2017-04-01|website=SANS Institute|access-date=2018-05-28}} 9. ^{{cite web|last1=Lee|first1=Robert|title=The Who, What, Where, When and How of Effective Threat Hunting|url=https://www.sans.org/reading-room/whitepapers/analyst/who-what-where-when-effective-threat-hunting-36785|website=SANS Institute|publisher=SANS Institute|accessdate=29 May 2018}} 10. ^{{cite web|url=https://www.fireeye.com/current-threats/annual-threat-report/mtrends/rpt-m-trends-2017.html|website=Mandiant|title=M-Trends Report|accessdate=2018-05-28}} 11. ^{{cite web|title=State of Malware Detection and Prevention|url=https://www.ponemon.org/blog/new-ponemon-study-on-malware-detection-prevention-released|website=Ponemon Institute|publisher=Ponemon Institute|accessdate=29 May 2018}} 1 : Computer security procedures |
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