Justin Ibarra
eeb8ab7744
* Expand timestamp_override tests
* removed timestamp_override from eql sequence rules
* add config entry for eql rules with beats index and t_o
* add timestamp_override to missing fields
Removed changes from:
- rules/cross-platform/impact_hosts_file_modified.toml
- rules/windows/credential_access_lsass_memdump_file_created.toml
- rules/windows/defense_evasion_adding_the_hidden_file_attribute_with_via_attribexe.toml
- rules/windows/defense_evasion_execution_lolbas_wuauclt.toml
- rules/windows/defense_evasion_suspicious_certutil_commands.toml
- rules/windows/execution_command_shell_started_by_svchost.toml
(selectively cherry picked from commit 6bdfddac8e)
59 lines
2.1 KiB
TOML
59 lines
2.1 KiB
TOML
[metadata]
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creation_date = "2020/11/04"
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maturity = "production"
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updated_date = "2022/03/31"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies unusual processes connecting to domains using known free SSL certificates. Adversaries may employ a known
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encryption algorithm to conceal command and control traffic.
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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 = "Connection to Commonly Abused Free SSL Certificate Providers"
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note = """## Config
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If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
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"""
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risk_score = 21
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rule_id = "e3cf38fa-d5b8-46cc-87f9-4a7513e4281d"
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severity = "low"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Command and Control"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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network where network.protocol == "dns" and
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/* Add new free SSL certificate provider domains here */
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dns.question.name : ("*letsencrypt.org", "*.sslforfree.com", "*.zerossl.com", "*.freessl.org") and
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/* Native Windows process paths that are unlikely to have network connections to domains secured using free SSL certificates */
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process.executable : ("C:\\Windows\\System32\\*.exe",
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"C:\\Windows\\System\\*.exe",
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"C:\\Windows\\SysWOW64\\*.exe",
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"C:\\Windows\\Microsoft.NET\\Framework*\\*.exe",
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"C:\\Windows\\explorer.exe",
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"C:\\Windows\\notepad.exe") and
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/* Insert noisy false positives here */
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not process.name : ("svchost.exe", "MicrosoftEdge*.exe", "msedge.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 = "T1573"
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name = "Encrypted Channel"
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reference = "https://attack.mitre.org/techniques/T1573/"
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[rule.threat.tactic]
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id = "TA0011"
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name = "Command and Control"
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reference = "https://attack.mitre.org/tactics/TA0011/"
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