sigma-rules/rules/windows/collection_email_powershell_exchange_mailbox.toml

[metadata]
creation_date = "2020/12/15"
maturity = "production"
updated_date = "2020/12/15"

[rule]
author = ["Elastic"]
description = """
Identifies the use of the Exchange PowerShell cmdlet, New-MailBoxExportRequest, to export the contents of a primary mailbox or
archive to a .pst file. Adversaries may target user email to collect sensitive information.
"""
false_positives = ["Legitimate exchange system administration activity."]
index = ["logs-endpoint.events.*", "winlogbeat-*"]
language = "eql"
license = "Elastic License"
name = "Exporting Exchange Mailbox via PowerShell"
references = [
    "https://www.volexity.com/blog/2020/12/14/dark-halo-leverages-solarwinds-compromise-to-breach-organizations/",
    "https://docs.microsoft.com/en-us/powershell/module/exchange/new-mailboxexportrequest?view=exchange-ps",
]
risk_score = 47
rule_id = "6aace640-e631-4870-ba8e-5fdda09325db"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Collection"]
type = "eql"

query = '''
process where event.type in ("start", "process_started") and
  process.name: ("powershell.exe", "pwsh.exe") and process.args : "New-MailboxExportRequest*"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1114"
name = "Email Collection"
reference = "https://attack.mitre.org/techniques/T1114/"


[rule.threat.tactic]
id = "TA0009"
name = "Collection"
reference = "https://attack.mitre.org/tactics/TA0009/"