Ross Wolf
5fcece8416
Co-Authored-By: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-Authored-By: Craig Chamberlain <randomuserid@users.noreply.github.com> Co-Authored-By: David French <56409778+threat-punter@users.noreply.github.com> Co-Authored-By: Derek Ditch <dcode@users.noreply.github.com> Co-Authored-By: Justin Ibarra <brokensound77@users.noreply.github.com>
47 lines
1.3 KiB
TOML
47 lines
1.3 KiB
TOML
[metadata]
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creation_date = "2020/04/21"
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ecs_version = ["1.4.0"]
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maturity = "production"
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updated_date = "2020/04/21"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies file permission modifications in common writable directories by a non-root user. Adversaries often drop files
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or payloads into a writable directory and change permissions prior to execution.
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"""
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false_positives = [
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"""
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Certain programs or applications may modify files or change ownership in writable directories. These can be exempted
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by username.
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""",
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]
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index = ["auditbeat-*"]
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language = "kuery"
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license = "Elastic License"
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name = "File Permission Modification in Writable Directory"
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risk_score = 21
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rule_id = "9f9a2a82-93a8-4b1a-8778-1780895626d4"
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severity = "low"
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tags = ["Elastic", "Linux"]
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type = "query"
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query = '''
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event.action:executed and process.name:(chmod or chown or chattr or chgrp) and process.working_directory:(/tmp or /var/tmp or /dev/shm) and not user.name:root
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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 = "T1222"
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name = "File and Directory Permissions Modification"
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reference = "https://attack.mitre.org/techniques/T1222/"
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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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