Jonhnathan
46 lines
1.6 KiB
TOML
46 lines
1.6 KiB
TOML
[metadata]
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creation_date = "2021/07/30"
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maturity = "production"
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updated_date = "2021/07/30"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies process execution events where the command line value contains a long sequence of whitespace characters or
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multiple occurrences of contiguous whitespace. Attackers may attempt to evade signature-based detections by padding
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their malicious command with unnecessary whitespace characters. These observations should be investigated for malicious
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behavior.
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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 = "Whitespace Padding in Process Command Line"
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note = """## Triage and analysis
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- Analyze the command line of the process in question for evidence of malicious code execution.
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- Review the ancestor and child processes spawned by the process in question for indicators of further malicious code execution."""
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references = ["https://twitter.com/JohnLaTwC/status/1419251082736201737"]
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risk_score = 47
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rule_id = "e0dacebe-4311-4d50-9387-b17e89c2e7fd"
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severity = "medium"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
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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 event.type in ("start", "process_started") and
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process.command_line regex ".*[ ]{20,}.*" or
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/* this will match on 3 or more separate occurrences of 5+ contiguous whitespace characters */
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process.command_line regex ".*(.*[ ]{5,}[^ ]*){3,}.*"
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[rule.threat.tactic]
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id = "TA0005"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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name = "Defense Evasion"
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