shashank-elastic
95 lines
2.8 KiB
TOML
95 lines
2.8 KiB
TOML
[metadata]
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creation_date = "2023/01/13"
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integration = ["endpoint", "windows", "system"]
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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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description = """
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Detects Linux Bash commands from the the Windows Subsystem for Linux. Adversaries may enable and use WSL for Linux to
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avoid detection.
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"""
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from = "now-9m"
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index = [
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"winlogbeat-*",
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"logs-endpoint.events.process-*",
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"logs-windows.*",
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"endgame-*",
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"logs-system.security*",
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]
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language = "eql"
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license = "Elastic License v2"
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name = "Suspicious Execution via Windows Subsystem for Linux"
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references = [
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"https://blog.f-secure.com/hunting-for-windows-subsystem-for-linux/",
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"https://lolbas-project.github.io/lolbas/OtherMSBinaries/Wsl/",
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"https://blog.qualys.com/vulnerabilities-threat-research/2022/03/22/implications-of-windows-subsystem-for-linux-for-adversaries-defenders-part-1",
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]
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risk_score = 21
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rule_id = "3e0eeb75-16e8-4f2f-9826-62461ca128b7"
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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: Execution",
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"Tactic: Defense Evasion",
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"Data Source: Elastic Endgame",
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"Data Source: Elastic Defend",
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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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process where host.os.type == "windows" and event.type : "start" and
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(
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(
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(process.executable : "?:\\Windows\\System32\\bash.exe" or ?process.pe.original_file_name == "Bash.exe") and
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not process.command_line : ("bash", "bash.exe")
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) or
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process.executable : "?:\\Users\\*\\AppData\\Local\\Packages\\*\\rootfs\\usr\\bin\\bash" or
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(
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process.parent.name : "wsl.exe" and ?process.parent.command_line : "bash*" and not process.name : "wslhost.exe"
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) or
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(
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process.name : "wsl.exe" and process.args : (
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"curl", "/etc/shadow", "/etc/passwd", "cat", "--system", "root", "-e", "--exec", "bash", "/mnt/c/*"
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) and not process.args : ("wsl-bootstrap", "docker-desktop-data", "*.vscode-server*")
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)
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) and
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not process.parent.executable : ("?:\\Program Files\\Docker\\*.exe", "?:\\Program Files (x86)\\Docker\\*.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 = "T1202"
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name = "Indirect Command Execution"
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reference = "https://attack.mitre.org/techniques/T1202/"
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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 = "T1059.004"
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name = "Unix Shell"
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reference = "https://attack.mitre.org/techniques/T1059/004/"
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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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