ioc

Falcon IOC samples

The examples within this folder focus on leveraging CrowdStrike's Falcon IOC API.

• Create Indicator of Compromise
• IOC Audit

Create Indicator of Compromise

Demonstrates the creation of a single IOC using either the Service or Uber Class. Indicator detail is loaded from an external file that can be specified via the command line.

Running the program

In order to run this demonstration, you you will need access to CrowdStrike API keys with the following scopes:

Service Collection	Scope
IOC	WRITE

Execution syntax

This sample leverages simple command-line arguments to implement functionality.

Basic usage

Create an indicator using sample indicator file example_indicator.json. The default method uses the Service Class to interact with the CrowdStrike API.

python3 create_ioc.py -k $FALCON_CLIENT_ID -s $FALCON_CLIENT_SECRET

Perform the operation using the Uber class instead with the -m argument.

python3 create_ioc.py -k $FALCON_CLIENT_ID -s $FALCON_CLIENT_SECRET -m uber

Load a custom indicator file with the -i argument. (Indicator should be in JSON format.)

python3 create_ioc.py -k $FALCON_CLIENT_ID -s $FALCON_CLIENT_SECRET -i custom_indicator.json

Command-line help

Command-line help is available via the -h argument.

python3 create_ioc.py -h
usage: create_ioc.py [-h] -k FALCON_CLIENT_ID -s FALCON_CLIENT_SECRET [-m METHOD] [-i INDICATOR]

 ___  _______  _______
|   ||   _   ||   _   |
|.  ||.  |   ||.  1___|
|.  ||.  |   ||.  |___
|:  ||:  1   ||:  1   |
|::.||::.. . ||::.. . |
`---'`-------'`-------'

Create IOC Example - @jshcodes 06.23.21

FalconPy v.0.8.6+

INDICATOR FILE FORMAT EXAMPLE (JSON)
{
    "source": "Test",
    "action": "detect",
    "expiration": "2023-01-22T15:00:00.000Z",
    "description": "Testing",
    "type": "ipv4",
    "value": "4.1.42.34",
    "platforms": ["linux"],
    "severity": "LOW",
    "applied_globally": true
}

optional arguments:
  -h, --help            show this help message and exit
  -k FALCON_CLIENT_ID, --falcon_client_id FALCON_CLIENT_ID
                        Falcon API Client ID
  -s FALCON_CLIENT_SECRET, --falcon_client_secret FALCON_CLIENT_SECRET
                        Falcon API Client Secret
  -m METHOD, --method METHOD
                        SDK method to use ('service' or 'uber').
  -i INDICATOR, --indicator INDICATOR
                        Path to the file representing the indicator (JSON format).

Example source code

The source code for this example can be found here.

---

IOC Audit

This program will output a list of IOCs and their details for either the current CID or in each Child CID (Flight Control scenarios). This can be used for regular audits of IOCs across multiple CIDs.

Running the program

In order to run this demonstration, you you will need access to CrowdStrike API keys with the following scopes:

Service Collection	Scope
IOC	READ
Flight Control	READ
Sensor Download	READ

Note

This program can be executed using an API key that is not scoped for the Flight Control (MSSP) and Sensor Download service collections, but will be unable to lookup the current CID (Sensor Download) or access child CIDs (Flight Control).

Execution syntax

This sample leverages simple command-line arguments to implement functionality.

Basic usage

Execute the default example. This will output results to a CSV file named iocs.txt.

python3 ioc_audit.py -k $FALCON_CLIENT_ID -s $FALCON_CLIENT_SECRET

This sample supports Environment Authentication, meaning you can execute any of the command lines shown below without providing credentials if you have the values FALCON_CLIENT_ID and FALCON_CLIENT_SECRET defined in your environment.

python3 ioc_audit.py

Change the output destination with the -o argument.

python3 ioc_audit.py -k $FALCON_CLIENT_ID -s $FALCON_CLIENT_SECRET -o new_iocs.txt

Enable MSSP mode and audit all Flight Control children with the -m argument.

python3 ioc_audit.py -k $FALCON_CLIENT_ID_PARENT -s $FALCON_CLIENT_SECRET_PARENT -m

Enable MSSP mode and audit a specific Flight Control child with the -c argument.

python3 ioc_audit.py -k $FALCON_CLIENT_ID_PARENT -s $FALCON_CLIENT_SECRET_PARENT -c CHILD_CID

API debugging can be enabled using the -d argument.

python3 ioc_audit.py -d

Command-line help

Command-line help is available via the -h argument.

usage: ioc_audit.py [-h] [-d] [-m] [-c CHILD] [-o OUTPUT_FILE] [-k CLIENT_ID] [-s CLIENT_SECRET]

 _______                        __ _______ __        __ __
|   _   .----.-----.--.--.--.--|  |   _   |  |_.----|__|  |--.-----.
|.  1___|   _|  _  |  |  |  |  _  |   1___|   _|   _|  |    <|  -__|
|.  |___|__| |_____|________|_____|____   |____|__| |__|__|__|_____|
|:  1   |                         |:  1   |
|::.. . |                         |::.. . |           FalconPy
`-------'                         `-------'

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█▄▄ ▄▀▄ █▄▄  █▄ █▄█ ▄▄█  █  █▄█ █ █ ▄▄█

This program will output a list of IOCs and their details for either the
current CID or in each Child CID (Flight Control scenarios). This can be
used for regular audits of indicators of compromise across multiple CIDs.

Developed by @Don-Swanson-Adobe

optional arguments:
  -h, --help            show this help message and exit
  -d, --debug           Enable API debugging
  -m, --mssp            List exclusions in all child CIDs (MSSP parents only)
  -c CHILD, --child CHILD
                        List exclusions in a specific child CID (MSSP parents only)
  -o OUTPUT_FILE, --output_file OUTPUT_FILE
                        File to output results to

Required arguments:
  -k CLIENT_ID, --client_id CLIENT_ID
                        CrowdStrike Falcon API key
  -s CLIENT_SECRET, --client_secret CLIENT_SECRET
                        CrowdStrike Falcon API secret

Example source code

The source code for this example can be found here.