Suspicious Endpoint Security Parent Process

 1[metadata]
 2creation_date = "2020/08/24"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2023/06/22"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12A suspicious Endpoint Security parent process was detected. This may indicate a process hollowing or other form of code
13injection.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Suspicious Endpoint Security Parent Process"
20note = """## Setup
21
22If 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.
23"""
24risk_score = 47
25rule_id = "b41a13c6-ba45-4bab-a534-df53d0cfed6a"
26severity = "medium"
27tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
28timestamp_override = "event.ingested"
29type = "eql"
30
31query = '''
32process where host.os.type == "windows" and event.type == "start" and
33 process.name : ("esensor.exe", "elastic-endpoint.exe") and
34 process.parent.executable != null and
35  /* add FPs here */
36 not process.parent.executable : ("C:\\Program Files\\Elastic\\*",
37                                  "C:\\Windows\\System32\\services.exe",
38                                  "C:\\Windows\\System32\\WerFault*.exe",
39                                  "C:\\Windows\\System32\\wermgr.exe")
40'''
41
42
43[[rule.threat]]
44framework = "MITRE ATT&CK"
45[[rule.threat.technique]]
46id = "T1036"
47name = "Masquerading"
48reference = "https://attack.mitre.org/techniques/T1036/"
49
50
51[rule.threat.tactic]
52id = "TA0005"
53name = "Defense Evasion"
54reference = "https://attack.mitre.org/tactics/TA0005/"