Jonhnathan
51cf7574a9
* [Rule Deprecation] PowerShell Rules * Update defense_evasion_posh_obfuscation_index_reversal.toml
120 lines
3.4 KiB
TOML
120 lines
3.4 KiB
TOML
[metadata]
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creation_date = "2023/07/14"
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integration = ["windows"]
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maturity = "production"
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updated_date = "2026/02/09"
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[rule]
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author = ["Elastic"]
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building_block_type = "default"
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description = """
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Identifies the use of Cmdlets and methods related to Microsoft Exchange Transport Agents install. Adversaries may
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leverage malicious Microsoft Exchange Transport Agents to execute tasks in response to adversary-defined criteria,
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establishing persistence.
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"""
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from = "now-119m"
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index = ["winlogbeat-*", "logs-windows.powershell*"]
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interval = "60m"
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language = "kuery"
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license = "Elastic License v2"
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name = "Deprecated - Microsoft Exchange Transport Agent Install Script"
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risk_score = 21
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rule_id = "846fe13f-6772-4c83-bd39-9d16d4ad1a81"
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setup = """## Setup
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PowerShell Script Block Logging must be enabled to generate the events used by this rule (e.g., 4104).
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Setup instructions: https://ela.st/powershell-logging-setup
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"""
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severity = "low"
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tags = [
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"Domain: Endpoint",
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"OS: Windows",
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"Use Case: Threat Detection",
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"Tactic: Persistence",
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"Data Source: PowerShell Logs",
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"Rule Type: BBR",
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]
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timestamp_override = "event.ingested"
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type = "query"
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query = '''
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event.category: "process" and host.os.type:windows and
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powershell.file.script_block_text : (
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(
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"Install-TransportAgent" or
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"Enable-TransportAgent"
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)
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) and
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not user.id : "S-1-5-18" and
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not powershell.file.script_block_text : (
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"'Install-TransportAgent', 'Invoke-MonitoringProbe', 'Mount-Database', 'Move-ActiveMailboxDatabase'," or
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"'Enable-TransportAgent', 'Enable-TransportRule', 'Export-ActiveSyncLog', 'Export-AutoDiscoverConfig'," or
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("scriptCmd.GetSteppablePipeline" and "ForwardHelpTargetName Install-TransportAgent")
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)
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'''
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[[rule.filters]]
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[rule.filters.meta]
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negate = true
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[rule.filters.query.wildcard."file.path"]
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case_insensitive = true
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value = "?:\\\\Users\\\\*\\\\AppData\\\\Roaming\\\\Microsoft\\\\Exchange\\\\RemotePowerShell\\\\*"
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[[rule.filters]]
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[rule.filters.meta]
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negate = true
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[rule.filters.query.wildcard."file.path"]
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case_insensitive = true
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value = "?:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\tmp_????????.???\\\\tmp_????????.???.ps?1"
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[[rule.filters]]
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[rule.filters.meta]
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negate = true
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[rule.filters.query.wildcard."file.path"]
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case_insensitive = true
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value = "?:\\\\Windows\\\\TEMP\\\\tmp_????????.???\\\\tmp_????????.???.ps?1"
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[[rule.filters]]
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[rule.filters.meta]
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negate = true
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[rule.filters.query.wildcard."file.path"]
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case_insensitive = true
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value = "?:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\*\\\\tmp_????????.???\\\\tmp_????????.???.ps?1"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1505"
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name = "Server Software Component"
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reference = "https://attack.mitre.org/techniques/T1505/"
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[[rule.threat.technique.subtechnique]]
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id = "T1505.002"
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name = "Transport Agent"
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reference = "https://attack.mitre.org/techniques/T1505/002/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1059"
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name = "Command and Scripting Interpreter"
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reference = "https://attack.mitre.org/techniques/T1059/"
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[[rule.threat.technique.subtechnique]]
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id = "T1059.001"
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name = "PowerShell"
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reference = "https://attack.mitre.org/techniques/T1059/001/"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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