shashank-elastic
88 lines
2.2 KiB
TOML
88 lines
2.2 KiB
TOML
[metadata]
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bypass_bbr_timing = true
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creation_date = "2023/09/21"
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integration = ["endpoint"]
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maturity = "production"
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updated_date = "2024/05/21"
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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 creation of a memory dump file with an unusual extension, which can indicate an attempt to disguise a
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memory dump as another file type to bypass security defenses.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.file-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Memory Dump File with Unusual Extension"
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risk_score = 21
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rule_id = "c0b9dc99-c696-4779-b086-0d37dc2b3778"
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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: Credential Access",
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"Tactic: Defense Evasion",
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"Data Source: Elastic Defend",
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"Rule Type: BBR",
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]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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file where host.os.type == "windows" and event.type == "creation" and
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/* MDMP header */
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file.Ext.header_bytes : "4d444d50*" and
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not file.extension : ("dmp", "mdmp", "hdmp", "edmp", "full", "tdref", "cg", "tmp", "dat") and
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not
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(
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process.executable : "?:\\Program Files\\Endgame\\esensor.exe" and
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process.code_signature.trusted == true and length(file.extension) == 0
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) and
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not
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(
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process.name : "System" and file.extension : "tmpscan"
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)
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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 = "T1003"
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name = "OS Credential Dumping"
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reference = "https://attack.mitre.org/techniques/T1003/"
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[[rule.threat.technique.subtechnique]]
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id = "T1003.001"
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name = "LSASS Memory"
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reference = "https://attack.mitre.org/techniques/T1003/001/"
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[rule.threat.tactic]
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id = "TA0006"
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name = "Credential Access"
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reference = "https://attack.mitre.org/tactics/TA0006/"
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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 = "T1036"
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name = "Masquerading"
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reference = "https://attack.mitre.org/techniques/T1036/"
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[[rule.threat.technique.subtechnique]]
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id = "T1036.008"
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name = "Masquerade File Type"
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reference = "https://attack.mitre.org/techniques/T1036/008/"
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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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