Jonhnathan
7fa0c0f719
* Create privilege_escalation_installertakeover.toml * Update privilege_escalation_installertakeover.toml * Update privilege_escalation_installertakeover.toml * Update privilege_escalation_installertakeover.toml * Update rules/windows/privilege_escalation_installertakeover.toml Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> * Update rules/windows/privilege_escalation_installertakeover.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update description and change OFN from : to == Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
83 lines
2.7 KiB
TOML
83 lines
2.7 KiB
TOML
[metadata]
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creation_date = "2021/11/25"
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maturity = "production"
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updated_date = "2021/11/25"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies a potential exploitation of InstallerTakeOver (CVE-2021-41379) default PoC execution. Successful exploitation
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allows an unprivileged user to escalate privileges to SYSTEM.
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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 = "Potential Privilege Escalation via InstallerFileTakeOver"
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note = """## Triage and analysis.
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### Investigating Potential Priivilege Escalation via InstallerFileTakeOver
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InstallerFileTakeOver is a weaponized EoP PoC to the CVE-2021-41379 vulnerability. Upon successful exploitation,
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an unprivileged user will escalate privileges to SYSTEM/NT AUTHORITY.
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This rule detects the default execution of the PoC, which overwrites the `elevation_service.exe` DACL and copy itself
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to the location to escalate privileges. An attacker is able to still take over any file that is not in use (locked), which is outside the scope of this rule.
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#### Possible investigation steps:
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- Check for the digital signature of the executable
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- Look for additional processes spawned by the process, command lines and network communications.
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- Look for additional alerts involving the host and the user.
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### False Positive Analysis
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- Verify whether the digital signature exists in the executable, and if it is valid.
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### Related Rules
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- Suspicious DLL Loaded for Persistence or Privilege Escalation - bfeaf89b-a2a7-48a3-817f-e41829dc61ee
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### Response and Remediation
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- Immediate response should be taken to validate activity, investigate and potentially isolate activity to prevent further
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post-compromise behavior.
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"""
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references = [
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"https://github.com/klinix5/InstallerFileTakeOver"
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]
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risk_score = 73
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rule_id = "58c6d58b-a0d3-412d-b3b8-0981a9400607"
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severity = "high"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Privilege Escalation"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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/* This rule is compatible with both Sysmon and Elastic Endpoint */
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process where event.type == "start" and
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user.id : "S-1-5-18" and
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(
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(process.name : "elevation_service.exe" and
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not process.pe.original_file_name == "elevation_service.exe") or
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(process.parent.name : "elevation_service.exe" and
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process.name : ("rundll32.exe", "cmd.exe", "powershell.exe"))
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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 = "T1068"
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reference = "https://attack.mitre.org/techniques/T1068/"
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name = "Exploitation for Privilege Escalation"
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[rule.threat.tactic]
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id = "TA0004"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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name = "Privilege Escalation"
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