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There is great excitement amongst security technology and service providers about the intersection of global threat intelligence with local observations in the network. While there is certainly cause for excitement, it’s worth pausing to ask the question “Is Threat Intelligence being used effectively?”
David Bianco explains that not all indicators of compromise are created equal. The pyramid defines the pain it will cause the adversary when you are able to deny those indicators to them.
Hash Values: SHA1, MD5 or other similar hashes that correspond to specific suspicious or malicious files. Hash Values are often used to provide unique references to specific samples of malware or to files involved in an intrusion. EventTracker can provide this functionality via its Change Audit feature.
IP Addresses: or even net blocks. If you deny the adversary the use of one of their IPs, they can usually recover quickly. EventTracker addresses these via its Behavior Module and the associated IP Reputation lookup.
Domain Names: These are harder to change than IP addresses. EventTracker can either use logs from a proxy or scan web server logs to detect such artifacts.
Host Artifact: For example, if the attacker’s HTTP recon tool uses a distinctive User-Agent string when searching your web content (off by one space or semicolon, for example. Or maybe they just put their name. Don’t laugh. This happens!). This can be detected by the Behavior Module in EventTracker when focused on the User Agent string from web server logs.
Tools: Artifacts of tools (eg DLLs or EXE names or hashes) that the attacker is using, can be detected via the Unknown Process module within EventTracker via the Change Audit feature.
Tactics, Techniques & Procedures: An example can be detecting Pass-the-hash attacks as called out by the NSA in their white paper and discussed in our webinar “Spotting the adversary with Windows Event Log Monitoring”
Bottom line: Having Threat Intelligence is not the same as using it effectively. The former is something you can buy, the latter is something you develop as a capability. It not only requires tools but also persistent, well trained humans.
Want both? Consider SIEM Simplified.
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