sigma-rules/rules/integrations/o365/impact_microsoft_365_potential_ransomware_activity.toml

[metadata]
creation_date = "2021/07/15"
integration = ["o365"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/06/22"

[rule]
author = ["Austin Songer"]
description = """
Identifies when Microsoft Cloud App Security reports that a user has uploaded files to the cloud that might be infected
with ransomware.
"""
false_positives = [
    """
    If Cloud App Security identifies, for example, a high rate of file uploads or file deletion activities it may
    represent an adverse encryption process.
    """,
]
from = "now-30m"
index = ["filebeat-*", "logs-o365*"]
language = "kuery"
license = "Elastic License v2"
name = "Microsoft 365 Potential ransomware activity"
note = """## Setup

The Office 365 Logs Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
"""
references = [
    "https://docs.microsoft.com/en-us/cloud-app-security/anomaly-detection-policy",
    "https://docs.microsoft.com/en-us/cloud-app-security/policy-template-reference",
]
risk_score = 47
rule_id = "721999d0-7ab2-44bf-b328-6e63367b9b29"
severity = "medium"
tags = ["Domain: Cloud", "Data Source: Microsoft 365", "Use Case: Configuration Audit", "Tactic: Impact"]
timestamp_override = "event.ingested"
type = "query"

query = '''
event.dataset:o365.audit and event.provider:SecurityComplianceCenter and event.category:web and event.action:"Potential ransomware activity" and event.outcome:success
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1486"
name = "Data Encrypted for Impact"
reference = "https://attack.mitre.org/techniques/T1486/"


[rule.threat.tactic]
id = "TA0040"
name = "Impact"
reference = "https://attack.mitre.org/tactics/TA0040/"