Samirbous
7488c60090
* [New] Process Created with a Duplicated Token using `process.Ext.effective_parent.executable` to detect impersonation using token duplicates from windows native binaries to run common lolbins or recently dropped unsigned ones : * Update privilege_escalation_create_process_with_token_unpriv.toml * Update privilege_escalation_create_process_with_token_unpriv.toml * Update rules/windows/privilege_escalation_create_process_with_token_unpriv.toml Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> * Update privilege_escalation_create_process_with_token_unpriv.toml --------- Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com>
79 lines
3.0 KiB
TOML
79 lines
3.0 KiB
TOML
[metadata]
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creation_date = "2023/10/02"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "New fields added: process.Ext.effective_parent.executable, process.Ext.effective_parent.name, process.Ext.relative_file_creation_time, process.Ext.relative_file_name_modify_time"
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min_stack_version = "8.4.0"
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updated_date = "2023/10/02"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the creation of a process impersonating the token of another user logon session. Adversaries may create a new
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process with a different token to escalate privileges and bypass access controls.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Process Created with a Duplicated Token"
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references = [
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"https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createprocesswithtokenw",
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]
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risk_score = 47
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rule_id = "1b0b4818-5655-409b-9c73-341cac4bb73f"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Privilege Escalation", "Data Source: Elastic Defend"]
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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 only compatible with Elastic Endpoint 8.4+ */
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process where host.os.type == "windows" and event.action == "start" and
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user.id : ("S-1-5-21-*", "S-1-12-1-*") and
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(process.Ext.effective_parent.executable regex~ """[C-Z]:\\Windows\\(System32|SysWOW64)\\[a-zA-Z0-9\-\_\.]+\.exe""" or
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process.Ext.effective_parent.executable : "?:\\Windows\\explorer.exe") and
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(
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process.name : ("powershell.exe", "cmd.exe", "rundll32.exe", "notepad.exe", "net.exe", "ntdsutil.exe",
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"tasklist.exe", "reg.exe", "certutil.exe", "bitsadmin.exe", "msbuild.exe", "esentutl.exe") or
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((process.Ext.relative_file_creation_time <= 900 or process.Ext.relative_file_name_modify_time <= 900) and
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not process.code_signature.status : ("trusted", "errorExpired", "errorCode_endpoint*") and
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not process.executable : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*"))
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) and
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not (process.name : "rundll32.exe" and
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process.command_line : ("*davclnt.dll,DavSetCookie*", "*?:\\Program Files*",
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"*\\Windows\\System32\\winethc.dll*", "*\\Windows\\SYSTEM32\\EDGEHTML.dll*",
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"*shell32.dll,SHCreateLocalServerRunDll*")) and
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not startswith~(process.Ext.effective_parent.name, process.parent.name)
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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 = "T1134"
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name = "Access Token Manipulation"
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reference = "https://attack.mitre.org/techniques/T1134/"
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[[rule.threat.technique.subtechnique]]
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id = "T1134.001"
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name = "Token Impersonation/Theft"
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reference = "https://attack.mitre.org/techniques/T1134/001/"
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[[rule.threat.technique.subtechnique]]
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id = "T1134.002"
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name = "Create Process with Token"
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reference = "https://attack.mitre.org/techniques/T1134/002/"
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[rule.threat.tactic]
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id = "TA0004"
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name = "Privilege Escalation"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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