Isai
1637f2dc79
* Update privilege_escalation_shadow_file_read.toml description update, name update, query update, tags update, MITRE update * Update privilege_escalation_shadow_file_read.toml edited order of MITRE * changed file name to match credential_access as primary tactic changed file name to match credential_access as primary tactic * excluded common executables, not related to "read", based on telemetry excluded common executables, not related to "read", based on telemetry * update cred access reference MITRE * toml-lint file for final validation * Rename credential_access_shadow_file_access.toml to privilege_escalation_shadow_file_access.toml revert name back to privilege_escalation... * Rename privilege_escalation_shadow_file_access.toml to privilege_escalation_shadow_file_read.toml * update update_date * Changed primary tactic back to privilege_escalation to match rule name Changed primary tactic back to privilege_escalation to match rule name
84 lines
2.4 KiB
TOML
84 lines
2.4 KiB
TOML
[metadata]
|
|
creation_date = "2022/09/01"
|
|
maturity = "production"
|
|
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
|
|
min_stack_version = "8.3.0"
|
|
updated_date = "2022/11/21"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
Identifies access to the /etc/shadow file via the commandline using standard system utilities. After elevating
|
|
privileges to root, threat actors may attempt to read or dump this file in order to gain valid credentials. They may
|
|
utilize these to move laterally undetected and access additional resources.
|
|
"""
|
|
from = "now-9m"
|
|
index = ["auditbeat-*", "logs-endpoint.events.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Potential Shadow File Read via Command Line Utilities"
|
|
references = ["https://www.cyberciti.biz/faq/unix-linux-password-cracking-john-the-ripper/"]
|
|
risk_score = 47
|
|
rule_id = "9a3a3689-8ed1-4cdb-83fb-9506db54c61f"
|
|
severity = "medium"
|
|
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Privilege Escalation", "Credential Access"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
process where event.type == "start" and event.action == "exec" and user.name == "root"
|
|
and (process.args : "/etc/shadow" or (process.working_directory: "/etc" and process.args: "shadow"))
|
|
and not process.executable:
|
|
("/usr/bin/tar",
|
|
"/bin/tar",
|
|
"/usr/bin/gzip",
|
|
"/bin/gzip",
|
|
"/usr/bin/zip",
|
|
"/bin/zip",
|
|
"/usr/bin/stat",
|
|
"/bin/stat",
|
|
"/usr/bin/cmp",
|
|
"/bin/cmp",
|
|
"/usr/bin/sudo",
|
|
"/bin/sudo",
|
|
"/usr/bin/find",
|
|
"/bin/find",
|
|
"/usr/bin/ls",
|
|
"/bin/ls",
|
|
"/usr/bin/uniq",
|
|
"/bin/uniq",
|
|
"/usr/bin/unzip",
|
|
"/bin/unzip")
|
|
and not process.parent.executable: "/bin/dracut"
|
|
'''
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
[[rule.threat.technique]]
|
|
id = "T1068"
|
|
name = "Exploitation for Privilege Escalation"
|
|
reference = "https://attack.mitre.org/techniques/T1068/"
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0004"
|
|
name = "Privilege Escalation"
|
|
reference = "https://attack.mitre.org/tactics/TA0004/"
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
[[rule.threat.technique]]
|
|
id = "T1003"
|
|
name = "OS Credential Dumping"
|
|
reference = "https://attack.mitre.org/techniques/T1003/"
|
|
[[rule.threat.technique.subtechnique]]
|
|
id = "T1003.008"
|
|
name = "/etc/passwd and /etc/shadow"
|
|
reference = "https://attack.mitre.org/techniques/T1003/008/"
|
|
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0006"
|
|
name = "Credential Access"
|
|
reference = "https://attack.mitre.org/tactics/TA0006/"
|