Justin Ibarra
85 lines
2.6 KiB
TOML
85 lines
2.6 KiB
TOML
[metadata]
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creation_date = "2020/09/02"
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ecs_version = ["1.6.0"]
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maturity = "production"
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updated_date = "2020/09/02"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies network activity from unexpected system applications. This may indicate adversarial activity as these
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applications are often leveraged by adversaries to execute code and evade detection.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*", "winlogbeat-*"]
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language = "eql"
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license = "Elastic License"
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name = "Unusual Network Activity from a Windows System Binary"
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risk_score = 21
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rule_id = "1fe3b299-fbb5-4657-a937-1d746f2c711a"
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severity = "medium"
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tags = ["Elastic", "Windows"]
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type = "eql"
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query = '''
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sequence by process.entity_id with maxspan=5m
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[process where event.type in ("start", "process_started") and
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/* known applocker bypasses */
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process.name in ("bginfo.exe",
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"cdb.exe",
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"control.exe",
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"cmstp.exe",
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"csi.exe",
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"dnx.exe",
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"fsi.exe",
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"ieexec.exe",
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"iexpress.exe",
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"installutil.exe",
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"Microsoft.Workflow.Compiler.exe",
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"MSBuild.exe",
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"msdt.exe",
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"mshta.exe",
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"msiexec.exe",
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"msxsl.exe",
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"odbcconf.exe",
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"rcsi.exe",
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"regsvr32.exe",
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"xwizard.exe")]
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[network where event.type == "connection" and
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process.name in ("bginfo.exe",
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"cdb.exe",
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"control.exe",
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"cmstp.exe",
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"csi.exe",
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"dnx.exe",
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"fsi.exe",
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"ieexec.exe",
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"iexpress.exe",
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"installutil.exe",
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"Microsoft.Workflow.Compiler.exe",
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"MSBuild.exe",
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"msdt.exe",
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"mshta.exe",
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"msiexec.exe",
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"msxsl.exe",
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"odbcconf.exe",
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"rcsi.exe",
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"regsvr32.exe",
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"xwizard.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 = "T1127"
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name = "Trusted Developer Utilities Proxy Execution"
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reference = "https://attack.mitre.org/techniques/T1127/"
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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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