AWS GuardDuty Cryptocurrency Activity Detected

Severity: high
Type: Alert
Author: Google Cloud Security
Source: github.com/chronicle/detection-rules

Amazon GuardDuty detects CryptoCurrency activity in Amazon EC2, AWS Lambda or Amazon EKS Runtimes.

MITRE ATT&CK coverage

Tactic	Techniques
Impact	`T1496` Resource Hijacking

Rule body

// Copyright 2023 Google LLC. Licensed under Apache-2.0.

rule aws_guardduty_crypto_currency_activity_detected {

  meta:
    author = "Google Cloud Security"
    description = "Amazon GuardDuty detects CryptoCurrency activity in Amazon EC2, AWS Lambda or Amazon EKS Runtimes."
    rule_id = "mr_be21d1ff-4d2b-4d0b-a928-0fa5d534cba5"
    rule_name = "AWS GuardDuty Cryptocurrency Activity Detected"
    mitre_attack_tactic = "Impact"
    mitre_attack_technique = "Resource Hijacking"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1496/"
    mitre_attack_version = "v13.1"
    type = "Alert"
    data_source = "AWS GuardDuty"
    platform = "AWS"
    severity = "High"
    priority = "High"

  events:
    $guardduty.metadata.vendor_name = "AMAZON"
    $guardduty.metadata.product_name = "AWS GuardDuty"
    $guardduty.metadata.product_event_type = /CryptoCurrency|CryptoMinerExecuted|BitcoinDomainRequest/
    //Filter out sample findings
    $guardduty.security_result.about.labels["Sample"] != "true"

  outcome:
    $risk_score = max(35)
    $mitre_attack_tactic = "Impact"
    $mitre_attack_technique = "Resource Hijacking"
    $mitre_attack_technique_id = "T1496"
    $event_count = count_distinct($guardduty.metadata.id)
    $principal_ip = array_distinct($guardduty.principal.ip)
    $principal_ip_country = array_distinct($guardduty.principal.ip_geo_artifact.location.country_or_region)
    $principal_ip_state = array_distinct($guardduty.principal.ip_geo_artifact.location.state)
    $principal_user_display_name = $guardduty.principal.user.user_display_name
    $aws_region = $guardduty.target.location.name
    $target_resource_name = $guardduty.target.resource.name
    $target_resource_product_object_id = $guardduty.target.resource.product_object_id
    $security_result_summary = array_distinct($guardduty.security_result.summary)
    $security_result_description = array_distinct($guardduty.security_result.description)
    $security_result_severity = array_distinct($guardduty.security_result.severity)
    $security_result_severity_details = array_distinct($guardduty.security_result.severity_details)
    $metadata_product_event_type = array_distinct($guardduty.metadata.product_event_type)

  condition:
    $guardduty
}

YARA-L rule structure

Condition

Fires when at least one $guardduty event.

Events

`$guardduty`

metadata.product_event_type matches "CryptoCurrency|CryptoMinerExecuted|BitcoinDomainRequest"
security_result.about.labels["Sample"] != "true"

Outcome

Outcome variables add context to a detection. When the rule generates an alert, $risk_score is displayed with it.

Field	Expression
`risk_score`	`max(35)`
`event_count`	`count_distinct($guardduty.metadata.id)`
`principal_ip`	`array_distinct($guardduty.principal.ip)`
`principal_ip_country`	`array_distinct($guardduty.principal.ip_geo_artifact.location.country_or_region)`
`principal_ip_state`	`array_distinct($guardduty.principal.ip_geo_artifact.location.state)`
`principal_user_display_name`	`$guardduty.principal.user.user_display_name`
`aws_region`	`$guardduty.target.location.name`
`target_resource_name`	`$guardduty.target.resource.name`
`target_resource_product_object_id`	`$guardduty.target.resource.product_object_id`
`security_result_summary`	`array_distinct($guardduty.security_result.summary)`
`security_result_description`	`array_distinct($guardduty.security_result.description)`
`security_result_severity`	`array_distinct($guardduty.security_result.severity)`
`security_result_severity_details`	`array_distinct($guardduty.security_result.severity_details)`
`metadata_product_event_type`	`array_distinct($guardduty.metadata.product_event_type)`