Privilege Escalation via Rogue Named Pipe Impersonation

calendar May 22, 2024 · Domain: Endpoint OS: Windows Use Case: Threat Detection Tactic: Privilege Escalation Data Source: Sysmon  ·
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Identifies a privilege escalation attempt via rogue named pipe impersonation. An adversary may abuse this technique by masquerading as a known named pipe and manipulating a privileged process to connect to it.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2021/10/13"
 3integration = ["windows"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies a privilege escalation attempt via rogue named pipe impersonation. An adversary may abuse this technique by
11masquerading as a known named pipe and manipulating a privileged process to connect to it.
12"""
13from = "now-9m"
14index = ["winlogbeat-*", "logs-windows.sysmon_operational-*"]
15language = "eql"
16license = "Elastic License v2"
17name = "Privilege Escalation via Rogue Named Pipe Impersonation"
18references = [
19    "https://itm4n.github.io/printspoofer-abusing-impersonate-privileges/",
20    "https://github.com/zcgonvh/EfsPotato",
21    "https://twitter.com/SBousseaden/status/1429530155291193354",
22]
23risk_score = 73
24rule_id = "76ddb638-abf7-42d5-be22-4a70b0bf7241"
25setup = """## Setup
26
27Named Pipe Creation Events need to be enabled within the Sysmon configuration by including the following settings:
28`condition equal "contains" and keyword equal "pipe"`
29
30If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
31events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
32Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
33`event.ingested` to @timestamp.
34For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
35"""
36severity = "high"
37tags = [
38    "Domain: Endpoint",
39    "OS: Windows",
40    "Use Case: Threat Detection",
41    "Tactic: Privilege Escalation",
42    "Data Source: Sysmon",
43]
44timestamp_override = "event.ingested"
45type = "eql"
46
47query = '''
48file where host.os.type == "windows" and event.action : "Pipe Created*" and
49 /* normal sysmon named pipe creation events truncate the pipe keyword */
50  file.name : "\\*\\Pipe\\*"
51'''
52
53
54[[rule.threat]]
55framework = "MITRE ATT&CK"
56[[rule.threat.technique]]
57id = "T1134"
58name = "Access Token Manipulation"
59reference = "https://attack.mitre.org/techniques/T1134/"
60
61
62[rule.threat.tactic]
63id = "TA0004"
64name = "Privilege Escalation"
65reference = "https://attack.mitre.org/tactics/TA0004/"

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