Unusual Process Execution Path - Alternate Data Stream

 1[metadata]
 2creation_date = "2020/12/04"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/03/28"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies processes running from an Alternate Data Stream. This is uncommon for legitimate processes and sometimes done
13by adversaries to hide malware.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.sysmon_operational-*", "endgame-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Unusual Process Execution Path - Alternate Data Stream"
20risk_score = 47
21rule_id = "4bd1c1af-79d4-4d37-9efa-6e0240640242"
22setup = """## Setup
23
24If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
25events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
26Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
27`event.ingested` to @timestamp.
28For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
29"""
30severity = "medium"
31tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend", "Data Source: Sysmon"]
32timestamp_override = "event.ingested"
33type = "eql"
34
35query = '''
36process where host.os.type == "windows" and event.type == "start" and
37  process.args : "?:\\*:*" and process.args_count == 1
38'''
39
40
41[[rule.threat]]
42framework = "MITRE ATT&CK"
43[[rule.threat.technique]]
44id = "T1564"
45name = "Hide Artifacts"
46reference = "https://attack.mitre.org/techniques/T1564/"
47[[rule.threat.technique.subtechnique]]
48id = "T1564.004"
49name = "NTFS File Attributes"
50reference = "https://attack.mitre.org/techniques/T1564/004/"
51
52
53
54[rule.threat.tactic]
55id = "TA0005"
56name = "Defense Evasion"
57reference = "https://attack.mitre.org/tactics/TA0005/"