AWS Lambda AWS-lambda

8 operations, identified by eventName in the audit log.

eventName	Description
_catch_all	Catch-all entry for AWS-lambda rules that match the service but not a specific eventName.
AddPermission	Grants an AWS service or another account permission to invoke a Lambda function by adding a statement to the function's resource-based policy.
CreateFunction	Creates a new Lambda function by uploading deployment package code and specifying the runtime, handler, and execution role.
CreateFunctionUrlConfig	Creates a function URL, a dedicated HTTP(S) endpoint, for the specified Lambda function or function alias.
Invoke	Synchronously invokes a Lambda function and returns the function's response payload.
ListFunctions	Returns a paginated list of Lambda functions in the current account and region, with optional filtering by runtime or layer.
PublishLayerVersion	Creates a new version of a Lambda layer by uploading a deployment package containing libraries or other dependencies.
UpdateFunctionConfiguration	Modifies the configuration settings of a Lambda function, such as its memory, timeout, environment variables, or execution role.

_catch_all: AWS-lambda (catch-all)

Service: AWS-lambda

Description

Catch-all entry for AWS-lambda rules that match the service but not a specific eventName.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

Common Indicators #

Field/value combinations most frequently checked by detection rules targeting this event, derived from cross-vendor predicate analysis.

Field	Kind	Value	Rules	Vendors
`Provider_Name`	eq	`lambda.amazonaws.com`	3 rules	elastic
`event.outcome`	eq	`success`	3 rules	elastic
`aws::eventSource`	eq	`lambda.amazonaws.com`	1 rule	panther, sigma, splunk
`aws::requestParameters`	starts_with	`principal=\`	1 rule	elastic

Detection Rules #

View all rules referencing this event →

Sigma #

AWS New Lambda Layer Attached source low: Detects when a user attached a Lambda layer to an existing Lambda function. A malicious Lambda layer could execute arbitrary code in the context of the function's IAM role. This would give an adversary access to resources that the function has access to.

Elastic #

AWS Lambda Layer Added to Existing Function source low: Identifies when a Lambda layer is added to an existing AWS Lambda function. Lambda layers allow shared code, dependencies, or runtime modifications to be injected into a function’s execution environment. Adversaries with the ability to update function configurations may add a malicious layer to establish persistence, run unauthorized code, or intercept data handled by the function. This activity should be reviewed to ensure the modification is expected and authorized.
AWS Lambda Function Policy Updated to Allow Public Invocation source medium: Identifies when an AWS Lambda function policy is updated to allow public invocation. This rule detects use of the AddPermission API where the Principal is set to "*", enabling any AWS account to invoke the function. Adversaries may abuse this configuration to establish persistence, create a covert execution path, or operate a function as an unauthenticated backdoor. Public invocation is rarely required outside very specific workloads and should be considered high-risk when performed unexpectedly.
AWS Lambda Function Created or Updated source low: Identifies when an AWS Lambda function is created or updated. AWS Lambda lets you run code without provisioning or managing servers. Adversaries can create or update Lambda functions to execute malicious code, exfiltrate data, or escalate privileges. This is a building block rule that does not generate alerts, but signals when a Lambda function is created or updated that matches the rule's conditions. To generate alerts, create a rule that uses this signal as a building block.

AddPermission

Service: AWS-lambda

Description

Grants an AWS service or another account permission to invoke a Lambda function by adding a statement to the function's resource-based policy.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

CreateFunction

Service: AWS-lambda

Description

Creates a new Lambda function by uploading deployment package code and specifying the runtime, handler, and execution role.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

CreateFunctionUrlConfig

Service: AWS-lambda

Description

Creates a function URL, a dedicated HTTP(S) endpoint, for the specified Lambda function or function alias.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

Common Indicators #

Field/value combinations most frequently checked by detection rules targeting this event, derived from cross-vendor predicate analysis.

Field	Kind	Value	Rules	Vendors
`aws::eventSource`	eq	`lambda.amazonaws.com`	1 rule	panther, sigma, splunk

Detection Rules #

View all rules referencing this event →

Sigma #

New AWS Lambda Function URL Configuration Created source medium: Detects when a user creates a Lambda function URL configuration, which could be used to expose the function to the internet and potentially allow unauthorized access to the function's IAM role for AWS API calls. This could give an adversary access to the privileges associated with the Lambda service role that is attached to that function.

Invoke

Service: AWS-lambda

Description

Synchronously invokes a Lambda function and returns the function's response payload.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

ListFunctions

Service: AWS-lambda

Description

Returns a paginated list of Lambda functions in the current account and region, with optional filtering by runtime or layer.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

PublishLayerVersion

Service: AWS-lambda

Description

Creates a new version of a Lambda layer by uploading a deployment package containing libraries or other dependencies.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

UpdateFunctionConfiguration

Service: AWS-lambda

Description

Modifies the configuration settings of a Lambda function, such as its memory, timeout, environment variables, or execution role.

Fields #

Name	Description
`eventName`	The name of the API action that was called.
`eventSource`	The AWS service endpoint that received the request (e.g. iam.amazonaws.com).
`eventType`	CloudTrail event category: AwsApiCall, AwsConsoleSignIn, AwsConsoleAction, AwsServiceEvent, or AwsVpceEvents.
`userIdentity`	The IAM entity that made the request (type, principalId, arn, accountId, sessionContext).
`sourceIPAddress`	IP address of the caller, or the AWS service principal for service-initiated calls.
`awsRegion`	AWS Region the request was made to.
`requestParameters`	Parameters sent with the request. Shape is action-specific; null when none.
`responseElements`	Response elements. Shape is action-specific; null for reads or when absent.
`errorCode`	AWS service error code when the request failed. Absent on success.
`errorMessage`	Description of the error when errorCode is present.

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`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

AWS Lambda AWS-lambda

_catch_all: AWS-lambda (catch-all)

Description

Fields #

Common Indicators #

Detection Rules #

Sigma #

Elastic #

AddPermission

Description

Fields #

CreateFunction

Description

Fields #

CreateFunctionUrlConfig

Description

Fields #

Common Indicators #

Detection Rules #

Sigma #

Invoke

Description

Fields #

ListFunctions

Description

Fields #

PublishLayerVersion

Description

Fields #

UpdateFunctionConfiguration

Description

Fields #

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