Jonhnathan
67ca13c1ce
* [Rule Tuning] Replace KQL exceptions for Query DSL Exceptions * update min_stack * build out schema in more detail for Filters * Update detection_rules/rule.py Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com> * Remove enum for definition * remove unused import * remove $state store * transform state * add call to super * add return type hint * use dataclass metadata * use Literal type --------- Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> Co-authored-by: Mika Ayenson <Mika.ayenson@elastic.co> Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com> Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com>
105 lines
3.1 KiB
TOML
105 lines
3.1 KiB
TOML
[metadata]
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creation_date = "2023/07/06"
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integration = ["windows"]
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maturity = "production"
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min_stack_comments = "KQL handles backslash and ? characters differently in 8.12+."
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min_stack_version = "8.12.0"
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updated_date = "2024/03/12"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the use of Cmdlets and methods related to Windows event log deletion activities. This is often done by
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attackers in an attempt to evade detection or destroy forensic evidence on a system.
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"""
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from = "now-119m"
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interval = "60m"
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index = ["winlogbeat-*", "logs-windows.powershell*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "PowerShell Script with Log Clear Capabilities"
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references = [
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"https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear",
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"https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventing.reader.eventlogsession.clearlog"
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]
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risk_score = 21
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rule_id = "3d3aa8f9-12af-441f-9344-9f31053e316d"
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setup = """## Setup
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The 'PowerShell Script Block Logging' logging policy must be enabled.
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Steps to implement the logging policy with Advanced Audit Configuration:
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```
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Computer Configuration >
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Administrative Templates >
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Windows PowerShell >
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Turn on PowerShell Script Block Logging (Enable)
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```
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Steps to implement the logging policy via registry:
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```
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reg add "hklm\\SOFTWARE\\Policies\\Microsoft\\Windows\\PowerShell\\ScriptBlockLogging" /v EnableScriptBlockLogging /t REG_DWORD /d 1
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```
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"""
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severity = "low"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: PowerShell Logs", "Rule Type: BBR"]
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timestamp_override = "event.ingested"
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type = "query"
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building_block_type = "default"
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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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"Clear-EventLog" or
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"Remove-EventLog" or
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("Eventing.Reader.EventLogSession" and ".ClearLog") or
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("Diagnostics.EventLog" and ".Clear")
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) and
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not powershell.file.script_block_text : (
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"CmdletsToExport=@(\"Add-Content\""
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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" = "?:\\\\Windows\\\\system32\\\\WindowsPowerShell\\\\v1.0\\\\Modules\\\\Microsoft.PowerShell.Management\\\\*.psd1"
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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 = "T1070"
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name = "Indicator Removal"
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reference = "https://attack.mitre.org/techniques/T1070/"
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[[rule.threat.technique.subtechnique]]
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id = "T1070.001"
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name = "Clear Windows Event Logs"
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reference = "https://attack.mitre.org/techniques/T1070/001/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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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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