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Powered by GitBook
On this page
  • Overview
  • Built-in globals
  • Using globals
  • Viewing globals
  • Adding custom globals
  • Importing globals in detections
  • Removing references to helper functions from detections
  • Common helpers
  • deep_get()
  • deep_walk()
  • is_ip_in_network()
  • pattern_match()
  • pattern_match_list()
  • aws_strip_role_session_id()
  • is_base64()
  • get_string_set()
  • put_string_set()

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  1. Detections
  2. Rules and Scheduled Rules
  3. Writing Python Detections

Global Helper Functions

PreviousData ModelsNextModifying Detections with Inline Filters (Beta)

Last updated 5 months ago

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Overview

A common pattern in programming is to extract repeated code into helper functions—Panther supports this pattern with the global analysis type. Panther provides a number of , and you can also . Learn more about certain below.

Global helpers are not best suited to frequent changes. If you do need to make frequent changes, consider instead using , which support automatic syncing with S3 and don't require code changes within Panther for updates.

Built-in globals

By default, Panther provides the following collections of built-in global helpers:

  • : Contains various generic and log source-specific helpers. Learn more about certain functions defined in panther_base_helpers below, in .

  • : Provides caching functions. Learn more about the panther_detection_helpers package .

While some globals require configuration, it is recommended to for any custom methods or logic that you would like to add. This reduces the chances of dealing with complex merge conflicts when updating your detection sources.

Using globals

Viewing globals

  • To view Panther-provided and custom helper files in the Console, in the left-hand navigation bar of your Panther Console, click Detections, then click the Helpers tab.

  • To view Panther-provided helper files in the CLI workflow, see the .

Adding custom globals

To create a new global in the Panther Console:

  1. In the left-hand navigation bar of your Panther Console, click Detections.

  2. Click the Helpers tab.

  3. Type your Python functions, then click Create. This global can now be imported in your rules or policies.

Global functions allow common logic to be shared across either rules or policies. To declare them as code, add them into the global_helpers folder with a similar pattern to rules and policies.

Globals defined outside of the global_helpers folder will not be loaded.

  1. Create your Python file (global_helpers/acmecorp.py):

from fnmatch import fnmatch

RESOURCE_PATTERN = 'acme-corp-*-[0-9]'


def matches_internal_naming(resource_name):
  return fnmatch(resource_name, RESOURCE_PATTERN)

2. Create your specification file:

AnalysisType: global
GlobalID: acmecorp
Filename: acmecorp.py
Description: A set of helpers internal to acme-corp

3. Use this helper in a policy (or a rule):

import acmecorp


def policy(resource):
  return acmecorp.matches_internal_naming(resource['Name'])

Importing globals in detections

Import global helpers using an import statement at the top of your analysis file, then call the helper as if it were any other Python library.

For example:

import panther_aws_helpers

def rule(event):
  return event['name'] == 'test-bucket'

def title(event):
  # Lookup the account name from an account Id
  account_name = panther_aws_helpers.lookup_aws_account_name(event['accountId'])
  return 'Suspicious request made to account ' + account_name

Removing references to helper functions from detections

Common helpers

deep_get()

deep_get() can be used to return keys that are nested within Python dictionaries. This function is useful for safely returning nested keys and avoiding an AttributeError when a key is not present.

Example

With the following JSON, the deep_get function would return the value of result.

{ "outcome": { "reason": "VERIFICATION_ERROR", "result": "FAILURE" }}
deep_get(event, "outcome", "result") == "FAILURE"

default

deep_get() takes in an optional default parameter. If a key is not present at the expected location or the value at that location is None, the default value will be returned.

deep_get(event, "outcome", "nonexistent_key", default="Key Not Found") == "Key Not Found"

deep_walk()

As with deep_get(), this traversal is safe and will avoid any exceptions or errors. In the event that a key is not present in the structure, the default value is returned.

Example

With the following object, deep_walk() would return the value of very_nested_key:

{"key": {"multiple_nested_lists_with_dict": [[[{"very_nested_key": "very_nested_value"}]]]}}
deep_walk(event, "key", "multiple_nested_lists_with_dict", "very_nested_key", default="") == "very_nested_value"

default

Like deep_get(), deep_walk() takes an optional default parameter. If a key is not present in the provided event, the key is None, or the key is an empty list, the default value is returned instead.

Using the above example:

deep_walk(event, "key", "multiple_nested_lists_with_dict", "very_nested_nonexistent_key", default="") == ""

return_val

Unlike deep_get(), deep_walk() can return three distinct value classifications:

  • all

  • first

  • last

all

By default, deep_walk() will return all values for a given key. This is useful for cases where a key is duplicated in an event; however, if the number of values returned by all is one, only that value is returned.

For example:

{"key": {"inner_key": [{"nested_key": "nested_value"}, {"nested_key": "nested_value2"}]}}
deep_walk(event, "key", "inner_key", "nested_key", default="") == ['nested_value', 'nested_value2']

When using all and returning multiple values, the elements in the list can be accessed like any other Python list.

first

To return only the first found value for a key, specify return_val="first".

For example:

deep_walk(event, "key", "inner_key", "nested_key", default="", return_val="first") == "nested_value"

last

To return only the last found value for a key, specify return_val="last".

For example:

deep_walk(event, "key", "inner_key", "nested_key", default="", return_val="last") == "nested_value2"

is_ip_in_network()

is_ip_in_network() is a function to check if an IP address is within a list of IP ranges. This function can be used with a list of known internal networks for added context to the detection.

Example:

SHARED_IP_SPACE = [
    "192.168.0.0/16",
]

if is_ip_in_network(event.get("ipaddr"), SHARED_IP_SPACE):
    ...

pattern_match()

Example:

With the following JSON the pattern_match() function would return true.

{ "operation": "REST.PUT.OBJECT" }
pattern_match(event.get("operation", ""), "REST.*.OBJECT")

An example can be found in the AWS S3 Access Error detection.

pattern_match_list()

Similar to pattern_match(), pattern_match_list() can check that a string matches any pattern in a given list.

Example:

With the following JSON the pattern_match_list() function would return true.

{ "userAgent": "aws-sdk-go/1.29.7 (go1.13.7; darwin; amd64) APN/1.0 HashiCorp/1.0 Terraform/0.12.24 (+https://www.terraform.io)" }
ALLOWED_USER_AGENTS = {
    "* HashiCorp/?.0 Terraform/*",
    # 'console.ec2.amazonaws.com',
    # 'cloudformation.amazonaws.com',
}

pattern_match_list(event.get("userAgent"), ALLOWED_USER_AGENTS)

aws_strip_role_session_id()

aws_strip_role_session_id() strips the session ID our of the arn.

Example:

With the following value, aws_strip_role_session_id() would return arn:aws:sts::123456789012:assumed-role/demo

{ "arn": "arn:aws:sts::123456789012:assumed-role/demo/sessionName" }
aws_strip_role_session_id(user_identity.get("arn", ""))

is_base64()

is_base64() checks if the string is base64 encoded, and if so, returns the decoded string. If not, it returns an empty string.

get_string_set()

get_string_set is used to get a value from a Panther-managed cache based on its key. This is useful to retrieve state between detection invocations.

put_string_set()

put_string_set is used to store a value into a Panther-managed cache based on its key. This is useful to store state between detection invocations.

New globals can be created from the or in your Panther Console.

It is highly discouraged to make external API requests from within your detections in Panther. In general, detections are processed at a very high scale, and making API requests can overload receiving systems and cause your rules to exceed the .

In the upper right corner, click Create New.

If you decide to remove dependencies from your detections, we recommend .

deep_get() is also available as a . For convenience, it's recommended to use that event function instead of this global helper function.

Located in .

If the key you are trying to access is nested inside a list, consider using instead.

This can be found in the detection.

deep_walk() is also available as a . For convenience, it's recommended to use that event function instead of this global helper function.

Located in .

deep_walk() can be used to return values associated with keys that are deeply nested in Python dictionaries, which may contain any number of dictionaries or lists. This functionality is the key differentiator between deep_walk() and .

This can be found in the detection.

Located in .

An example can be found in the detection.

Located in .

Wrapper around for basic pattern globs. This can be used when simple pattern matching is needed without the requirement of using regex.

Located in .

An example can be found in the detection.

Located in .

An example can be found in the detection.

Located in .

See an example in the .

Located in . Learn more about the panther_detection_helpers package .

.

Located in . Learn more about the panther_detection_helpers package .

.

Panther Analysis Tool
staggering the changes
panther_base_helpers
Geographically Improbable Okta Login
panther_base_helpers
GCP Service Account Access Denied
panther_base_helpers
OneLogin Active Login Activity
panther_base_helpers
fnmatch
panther_base_helpers
AWS EC2 Manual Security Group Change
panther_aws_helpers
AWS Unauthorized API Call
panther_base_helpers
Crowdstrike.Base64EncodedArgs detection
An example used in panther-analysis can be found here
An example used in panther-analysis can be found here
deep_walk()
deep_get()
Custom Lookup Tables
panther_base_helpers
global_helpers directory of the panther-analysis GitHub repository
built-in global helpers
add your own custom globals
common helpers
Common helpers
create a new global
panther_detection_helpers
panther_detection_helpers
15-second runtime limit
function on the event object itself
function on the event object itself
on Python Rules Caching
on Python Rules Caching
panther_detection_helpers
on Python Rules Caching
An arrow is drawn from "Detections" to "Helpers," and a page titled "Helpers is shown, with a table with various entries, including "crowdstrike_event_streams_helpers" and "gcp_environment".
The Helper Settings page shows fields for Helper Name and Description. Under Helper Definition, there is a code block with sample Python code written in it.