shashank-elastic
99 lines
3.3 KiB
TOML
99 lines
3.3 KiB
TOML
[metadata]
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creation_date = "2021/05/28"
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integration = ["endpoint", "windows"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/10/23"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies when a script interpreter or signed binary is launched via a non-standard working directory. An attacker may
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use this technique to evade defenses.
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"""
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Suspicious Execution from a Mounted Device"
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references = [
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"https://www.microsoft.com/security/blog/2021/05/27/new-sophisticated-email-based-attack-from-nobelium/",
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"https://www.volexity.com/blog/2021/05/27/suspected-apt29-operation-launches-election-fraud-themed-phishing-campaigns/",
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]
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risk_score = 47
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rule_id = "8a1d4831-3ce6-4859-9891-28931fa6101d"
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setup = """
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If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
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events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
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Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
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`event.ingested` to @timestamp.
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For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
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"""
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Tactic: Execution", "Data Source: Elastic Defend"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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process where host.os.type == "windows" and event.type == "start" and process.executable : "C:\\*" and
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(process.working_directory : "?:\\" and not process.working_directory: "C:\\") and
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process.parent.name : "explorer.exe" and
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process.name : ("rundll32.exe", "mshta.exe", "powershell.exe", "pwsh.exe", "cmd.exe", "regsvr32.exe",
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"cscript.exe", "wscript.exe")
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'''
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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 = "T1218"
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name = "System Binary Proxy Execution"
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reference = "https://attack.mitre.org/techniques/T1218/"
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[[rule.threat.technique.subtechnique]]
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id = "T1218.005"
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name = "Mshta"
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reference = "https://attack.mitre.org/techniques/T1218/005/"
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[[rule.threat.technique.subtechnique]]
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id = "T1218.010"
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name = "Regsvr32"
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reference = "https://attack.mitre.org/techniques/T1218/010/"
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[[rule.threat.technique.subtechnique]]
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id = "T1218.011"
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name = "Rundll32"
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reference = "https://attack.mitre.org/techniques/T1218/011/"
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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.technique.subtechnique]]
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id = "T1059.003"
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name = "Windows Command Shell"
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reference = "https://attack.mitre.org/techniques/T1059/003/"
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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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