2026-04-13 08-31-23

May 25, 2026 14:25 · 7:37 · English · Whisper Turbo · 2 කථානායක

මේ පිටපත අද කල් ඉකුත් වෙනවා. ස්ථිර ගබඩාව සඳහා උසස් →

දේශන සූචිය

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S… Speaker 2 (2026-04-13 08-31-23)

In this video,

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S… Speaker 1 (2026-04-13 08-31-23)

we're going to take a look at scheduled tasks,

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S… Speaker 1 (2026-04-13 08-31-23)

how attackers can abuse scheduled tasks,

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S… Speaker 1 (2026-04-13 08-31-23)

and indicators we can use to search logs for

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S… Speaker 1 (2026-04-13 08-31-23)

evidence of that type of malicious use.

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S… Speaker 2 (2026-04-13 08-31-23)

So first of all,

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S… Speaker 1 (2026-04-13 08-31-23)

let's just really quickly go over what scheduled tasks are and how they can be

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S… Speaker 1 (2026-04-13 08-31-23)

used.

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S… Speaker 1 (2026-04-13 08-31-23)

If you're not familiar.

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S… Speaker 2 (2026-04-13 08-31-23)

So in Windows,

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S… Speaker 1 (2026-04-13 08-31-23)

scheduled task is basically just some sort of automated way

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S… Speaker 1 (2026-04-13 08-31-23)

to run some sort of a program or a script.

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S… Speaker 1 (2026-04-13 08-31-23)

There's many different ways that these scheduled tasks,

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S… Speaker 1 (2026-04-13 08-31-23)

these automations can be triggered.

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S… Speaker 1 (2026-04-13 08-31-23)

You can have them done by date and time,

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S… Speaker 1 (2026-04-13 08-31-23)

so you can have a scheduled task start.

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S… Speaker 1 (2026-04-13 08-31-23)

at a specific date and time.

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S… Speaker 1 (2026-04-13 08-31-23)

You can have them run at a regular interval,

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S… Speaker 1 (2026-04-13 08-31-23)

maybe, you know,

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S… Speaker 2 (2026-04-13 08-31-23)

once an hour,

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S… Speaker 1 (2026-04-13 08-31-23)

once a day,

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S… Speaker 1 (2026-04-13 08-31-23)

once every two weeks,

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S… Speaker 1 (2026-04-13 08-31-23)

anything like that.

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S… Speaker 1 (2026-04-13 08-31-23)

And you can have them run when the user logs in or

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S… Speaker 1 (2026-04-13 08-31-23)

when Windows boots up.

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S… Speaker 1 (2026-04-13 08-31-23)

Those two right there are two that are commonly used by

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S… Speaker 1 (2026-04-13 08-31-23)

attackers, and we'll see why here in just a second.

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S… Speaker 1 (2026-04-13 08-31-23)

You can also have triggers based on when the workstation is

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S… Speaker 1 (2026-04-13 08-31-23)

locked or unlocked,

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S… Speaker 1 (2026-04-13 08-31-23)

and there are a lot more triggers.

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S… Speaker 1 (2026-04-13 08-31-23)

than just these.

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S… Speaker 1 (2026-04-13 08-31-23)

These are just a few of the ones that are commonly used,

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S… Speaker 1 (2026-04-13 08-31-23)

but there's a lot more than this.

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S… Speaker 1 (2026-04-13 08-31-23)

Attackers will use scheduled tasks primarily and very frequently

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S… Speaker 1 (2026-04-13 08-31-23)

for persistence mechanisms and being able

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S… Speaker 1 (2026-04-13 08-31-23)

to have a more stealthier way of executing those persistence

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S… Speaker 2 (2026-04-13 08-31-23)

mechanisms.

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S… Speaker 1 (2026-04-13 08-31-23)

The scheduled tasks,

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S… Speaker 2 (2026-04-13 08-31-23)

for example,

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S… Speaker 1 (2026-04-13 08-31-23)

they could create one that

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S… Speaker 1 (2026-04-13 08-31-23)

Verifies or ensures elevated access on an account

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S… Speaker 1 (2026-04-13 08-31-23)

every time the computer reboots Or maybe once an hour

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S… Speaker 1 (2026-04-13 08-31-23)

reaches out to a command and control server anything like that

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S… Speaker 1 (2026-04-13 08-31-23)

So then how are they actually abusing these scheduled

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S… Speaker 1 (2026-04-13 08-31-23)

tasks?

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S… Speaker 1 (2026-04-13 08-31-23)

Number one is going to be by creating a new malicious

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S… Speaker 1 (2026-04-13 08-31-23)

task.

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S… Speaker 1 (2026-04-13 08-31-23)

And these are going to be very kind of similar to what we saw with malicious

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S… Speaker 1 (2026-04-13 08-31-23)

Windows services as well.

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S… Speaker 1 (2026-04-13 08-31-23)

So there's a few ways that attackers can

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S… Speaker 1 (2026-04-13 08-31-23)

create malicious tasks here.

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S… Speaker 1 (2026-04-13 08-31-23)

They can do it through the command line using the SCH tasks command

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S… Speaker 1 (2026-04-13 08-31-23)

there with a forward slash.

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S… Speaker 1 (2026-04-13 08-31-23)

create, so they can create a malicious task through the command line.

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S… Speaker 1 (2026-04-13 08-31-23)

Of course,

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S… Speaker 1 (2026-04-13 08-31-23)

there is a PowerShell method to do it as well with the commandlet of new

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S… Speaker 1 (2026-04-13 08-31-23)

scheduled tasks.

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S… Speaker 1 (2026-04-13 08-31-23)

And then they can do it through the GUI as well,

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S… Speaker 1 (2026-04-13 08-31-23)

just using the task scheduler.

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S… Speaker 1 (2026-04-13 08-31-23)

Now, this one you're not going to see as often.

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S… Speaker 1 (2026-04-13 08-31-23)

because it requires them to,

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S… Speaker 1 (2026-04-13 08-31-23)

you know,

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S… Speaker 1 (2026-04-13 08-31-23)

have GUI access to the machine,

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S… Speaker 1 (2026-04-13 08-31-23)

be logged into the machine itself,

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S… Speaker 1 (2026-04-13 08-31-23)

whatever machine they're working on.

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S… Speaker 2 (2026-04-13 08-31-23)

Typically,

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S… Speaker 1 (2026-04-13 08-31-23)

you're going to see them done through command line methods,

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S… Speaker 1 (2026-04-13 08-31-23)

excuse me, either command line or PowerShell.

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S… Speaker 1 (2026-04-13 08-31-23)

But GUI is an option as well using just the built -in Windows

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S… Speaker 1 (2026-04-13 08-31-23)

task scheduler.

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S… Speaker 1 (2026-04-13 08-31-23)

This one can be a little more tricky to see in hunts.

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S… Speaker 1 (2026-04-13 08-31-23)

There is still going to be an event logged in the Windows event

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S… Speaker 1 (2026-04-13 08-31-23)

logs on the system for that,

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S… Speaker 1 (2026-04-13 08-31-23)

but you're not going to have quite as much evidence of the task creation as

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S… Speaker 1 (2026-04-13 08-31-23)

you would in something like command line or PowerShell.

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S… Speaker 2 (2026-04-13 08-31-23)

So you can still detect it.

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S… Speaker 1 (2026-04-13 08-31-23)

There's just not quite as much information.

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S… Speaker 1 (2026-04-13 08-31-23)

In addition to creating malicious tasks,

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S… Speaker 1 (2026-04-13 08-31-23)

attackers can also modify existing tasks that

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S… Speaker 1 (2026-04-13 08-31-23)

might be on the system.

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S… Speaker 1 (2026-04-13 08-31-23)

Now, again, this is going to require them to have access to be able to modify

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S… Speaker 1 (2026-04-13 08-31-23)

the task,

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S… Speaker 1 (2026-04-13 08-31-23)

and that's going to depend on the permissions they have on the system and the permissions

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S… Speaker 1 (2026-04-13 08-31-23)

required to modify that individual task.

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S… Speaker 1 (2026-04-13 08-31-23)

They can do this,

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S… Speaker 1 (2026-04-13 08-31-23)

again, using that SCH tasks command with a forward slash change

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S… Speaker 1 (2026-04-13 08-31-23)

instead.

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S… Speaker 1 (2026-04-13 08-31-23)

They can also do this with another PowerShell command with set scheduled

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S… Speaker 1 (2026-04-13 08-31-23)

task instead of new scheduled task.

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S… Speaker 2 (2026-04-13 08-31-23)

Now,

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S… Speaker 1 (2026-04-13 08-31-23)

with PowerShell,

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S… Speaker 1 (2026-04-13 08-31-23)

remember, and this applies to any sort of PowerShell indicator you're searching

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S… Speaker 1 (2026-04-13 08-31-23)

for, attackers are going to very commonly encode the PowerShell

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S… Speaker 1 (2026-04-13 08-31-23)

command using Base64.

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S… Speaker 1 (2026-04-13 08-31-23)

It is a built -in feature in PowerShell.

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S… Speaker 2 (2026-04-13 08-31-23)

If that is done,

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S… Speaker 2 (2026-04-13 08-31-23)

if it is an encoded command,

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S… Speaker 1 (2026-04-13 08-31-23)

you are not going to find any results if you're searching for something

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S… Speaker 1 (2026-04-13 08-31-23)

like new scheduled task or set scheduled task because it's part of the encoded

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S… Speaker 1 (2026-04-13 08-31-23)

command.

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S… Speaker 1 (2026-04-13 08-31-23)

All you will see is the encoded command.

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S… Speaker 1 (2026-04-13 08-31-23)

So don't be fooled if you're searching for new scheduled tasks and you don't

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S… Speaker 1 (2026-04-13 08-31-23)

find any of them in the logs,

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S… Speaker 1 (2026-04-13 08-31-23)

but you're pretty sure there was one that was created.

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S… Speaker 1 (2026-04-13 08-31-23)

Don't forget you want to search for any encoded PowerShell

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S… Speaker 2 (2026-04-13 08-31-23)

commands as well.

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S… Speaker 1 (2026-04-13 08-31-23)

Get those and then decode them and then you might see a new scheduled

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S… Speaker 1 (2026-04-13 08-31-23)

task in there.

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S… Speaker 1 (2026-04-13 08-31-23)

So keep that in mind when you're talking about searching and hunting for any

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S… Speaker 1 (2026-04-13 08-31-23)

type of PowerShell command.

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S… Speaker 1 (2026-04-13 08-31-23)

Now there's many different indicators we can look at and we just looked at a few of

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S… Speaker 2 (2026-04-13 08-31-23)

them Let's take a look at all of them.

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S… Speaker 1 (2026-04-13 08-31-23)

Here's kind of on one screen So you have them all for easy access

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S… Speaker 2 (2026-04-13 08-31-23)

So number one,

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S… Speaker 1 (2026-04-13 08-31-23)

the indicators you can search for for new scheduled

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S… Speaker 1 (2026-04-13 08-31-23)

task creation.

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S… Speaker 1 (2026-04-13 08-31-23)

So we talked about the SCH tasks command with the forward slash create.

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S… Speaker 1 (2026-04-13 08-31-23)

That would be a command line indicator you can search for.

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S… Speaker 1 (2026-04-13 08-31-23)

You have the PowerShell new scheduled task commandlet.

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S… Speaker 1 (2026-04-13 08-31-23)

Then you also have a series of event IDs you can search

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S… Speaker 1 (2026-04-13 08-31-23)

for. And these are built -in Windows events.

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S… Speaker 1 (2026-04-13 08-31-23)

These are not Sysmon events.

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S… Speaker 1 (2026-04-13 08-31-23)

So the first one is event ID 4698.

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S… Speaker 1 (2026-04-13 08-31-23)

This is for a new scheduled task being created.

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S… Speaker 1 (2026-04-13 08-31-23)

The second one is going to be event ID 4700.

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S… Speaker 1 (2026-04-13 08-31-23)

This is for a scheduled task that has been created but also needs

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S… Speaker 1 (2026-04-13 08-31-23)

to be enabled for it to run on whatever trigger that

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S… Speaker 1 (2026-04-13 08-31-23)

has been configured.

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S… Speaker 1 (2026-04-13 08-31-23)

Then you have in a kind of a different section or different channel

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S… Speaker 1 (2026-04-13 08-31-23)

of the Windows event logs,

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S… Speaker 1 (2026-04-13 08-31-23)

this is in a location that is dedicated just to

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S… Speaker 1 (2026-04-13 08-31-23)

task scheduler events.

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S… Speaker 1 (2026-04-13 08-31-23)

But you also have event ID 106.

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S… Speaker 1 (2026-04-13 08-31-23)

This is the same thing essentially as 4698 with a scheduled

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S… Speaker 1 (2026-04-13 08-31-23)

task being created.

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S… Speaker 1 (2026-04-13 08-31-23)

Then you also have indicators for if an attacker

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S… Speaker 1 (2026-04-13 08-31-23)

is modifying an existing scheduled task.

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S… Speaker 2 (2026-04-13 08-31-23)

Again,

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S… Speaker 1 (2026-04-13 08-31-23)

the SCH tasks command,

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S… Speaker 1 (2026-04-13 08-31-23)

this time with the forward slash change as a command line indicator.

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S… Speaker 1 (2026-04-13 08-31-23)

PowerShell indicator would be the set scheduled task.

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S… Speaker 1 (2026-04-13 08-31-23)

And then with event IDs,

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S… Speaker 1 (2026-04-13 08-31-23)

you have two of those you can look at.

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S… Speaker 1 (2026-04-13 08-31-23)

The regular Windows event ID is 4702,

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S… Speaker 1 (2026-04-13 08-31-23)

and the task scheduler channel event ID is 140,

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S… Speaker 1 (2026-04-13 08-31-23)

and both of those are for a scheduled task being updated.

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S… Speaker 2 (2026-04-13 08-31-23)

So again,

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S… Speaker 1 (2026-04-13 08-31-23)

attackers will very commonly use scheduled tasks for persistence

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S… Speaker 1 (2026-04-13 08-31-23)

mechanisms to ensure they have elevated access into

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S… Speaker 1 (2026-04-13 08-31-23)

the system for command and control communication or really whatever

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else their attack kind of requires for whatever they plan

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on doing.

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And there are many different ways you can find the

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S… Speaker 1 (2026-04-13 08-31-23)

abuse of scheduled tasks in a threat hunt.

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S… Speaker 1 (2026-04-13 08-31-23)

using many different types of indicators.

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