2026-04-13 19-24-41

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S… Speaker 1 (2026-04-13 19-24-41)

In this video,

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we're going to take a look at a hypothetical scenario and walk

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through a couple of options for how to begin a

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threat hunt for that scenario when we're working in

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Elk.

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So the scenario we're going to look at is an attacker has

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compromised the network and has dumped the SAM database to

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be able to steal password hashes and then use them in a pass

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S… Speaker 1 (2026-04-13 19-24-41)

the hash attack.

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to attempt to authenticate at various endpoints across the network.

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So if you watched the example or the hypothetical

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threat hunt we did for Splunk,

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this one's going to be very similar.

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And we're going to start with the first three steps here.

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S… Speaker 1 (2026-04-13 19-24-41)

Number one,

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we want to identify which logs we need to search

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through.

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for this threat hunt.

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Make sure we have those available to us.

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For this one,

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it's going to be fairly simple.

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We need the Windows security logs,

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S… Speaker 2 (2026-04-13 19-24-41)

specifically out of the Windows event logs.

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S… Speaker 2 (2026-04-13 19-24-41)

We could also use some PowerShell logs.

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S… Speaker 2 (2026-04-13 19-24-41)

That would be helpful depending on exactly what we're looking for and what we might

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find after the initial search.

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Don't forget that.

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Depending on what you find after some of your initial searches,

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S… Speaker 2 (2026-04-13 19-24-41)

it's very possible you may need to expand the search.

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scope of what logs you're looking at to continue the hunt but

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for the initial searches we're going to start with we're going to want to look at

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S… Speaker 2 (2026-04-13 19-24-41)

some of the windows event logs specifically the security logs and also the

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sysmon logs as well so there's a couple of different logs but typically

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S… Speaker 2 (2026-04-13 19-24-41)

as long as we have windows event logs accessible to us for

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this hunt and we have sysmon in there as well we should be good

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S… Speaker 1 (2026-04-13 19-24-41)

After that,

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we start building the initial query we want to use for

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the first phase of our hunt here.

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S… Speaker 2 (2026-04-13 19-24-41)

Let's take a look at that query.

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So we're starting out by looking for,

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I should say,

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a specific process running.

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That is what this win event data image is.

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Don't forget, an image is also known as a process.

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And we're looking for the command line or

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command line utility used to manage the registry on Windows.

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So we are looking for the process of reg .exe running.

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And then we're looking for a couple of specific things within

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that command line,

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what we're looking for for the win event data command line,

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both above and below that red line.

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This is all one search query.

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It's just on separate lines,

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so I could keep the font readable.

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So we're looking for two specific things.

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Now, as you can see here,

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we're looking for one particular method for

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exporting the SAM database.

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There's a few of them.

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This one, we're looking at exporting it from the registry.

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So this would be looking for those two key

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phrases in the command line.

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Save,

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and then the key we're trying to export.

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the hklm SAM key.

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So that is the specific type of SAM database

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theft that we're looking for with this command.

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And then based on what we find from that command,

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we then want to analyze whatever the results are to figure

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out what we should be doing next.

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And then,

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you know, pivot our search and pivot the hunt as necessary.

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So what should we be looking at next?

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So let's say that we...

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did find evidence of the SAM database

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being exported.

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We want to kind of continue that hunt,

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or really even if we didn't find that,

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if we still find,

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if we still suspect there may be,

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you know,

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credential theft happening on the network,

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but maybe we didn't find anything from the SAM database.

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We want to kind of expand there to search for known tools that

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are used to dump credentials.

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or some sort of unusual access to the LSAS Windows

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process.

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And this is basically can be an alternative to saving

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from the registry for the attacker.

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So in this query right here,

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we're searching for really anything in the logs that has

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in the command line command,

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the use of proc dump or mini cats to

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utilities that can be used to dump credentials.

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If we do have evidence of credential theft,

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we can then pivot into looking for specific authentication

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events.

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We can look for accounts authenticating from unusual locations

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at unusual times using specific methods.

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And we can do that by looking for the event ID 4624

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at a successful login.

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and then looking in the message field specifically to see if the

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authentication attempt was explicitly

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using NTLM to authenticate.

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From there,

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we can also start looking for any sort of tools

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that might be used to perform execution

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via pass the hash attacks.

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So we'd look for anything in the command line that was running WMIC

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for WMI commands,

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running PSEC,

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which is basically remote ways of controlling or running commands

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on computers.

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SMB exec,

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a Python script,

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but any of those that were not done under

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the username of system.

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That is where with KQL,

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we have the not in front of

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what we don't want to include.

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So in this case,

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we're saying do not include or any matches,

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any results that do not match this

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criteria right here.

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That is what we are saying by having the knot in front of there.

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From there,

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we could go on and look for any processes maybe

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that have an unusual parent process.

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So for this last query here,

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we're looking at the process of

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WMI PRV SE,

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which is the WMI provider host.

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It is associated with WMI commands as well.

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We're looking to see if that process

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then launched any other processes with command

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.exe or powershell .exe in the command

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line,

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which would definitely be unusual there.

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It would be a suspicious or potentially malicious use of

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WMI.

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So a very,

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you know, high -level hypothetical threat hunt,

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just to kind of provide some different examples of how we

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can pivot and how we can do searches specifically using KQL

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within Elk.

2026-04-13 19-24-41

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