Unusual Process Execution Path - Alternate Data Stream

 1[metadata]
 2creation_date = "2020/12/04"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies processes running from an Alternate Data Stream. This is uncommon for legitimate processes and sometimes done
11by adversaries to hide malware.
12"""
13from = "now-9m"
14index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.sysmon_operational-*", "endgame-*"]
15language = "eql"
16license = "Elastic License v2"
17name = "Unusual Process Execution Path - Alternate Data Stream"
18risk_score = 47
19rule_id = "4bd1c1af-79d4-4d37-9efa-6e0240640242"
20setup = """## Setup
21
22If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
23events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
24Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
25`event.ingested` to @timestamp.
26For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
27"""
28severity = "medium"
29tags = [
30    "Domain: Endpoint",
31    "OS: Windows",
32    "Use Case: Threat Detection",
33    "Tactic: Defense Evasion",
34    "Data Source: Elastic Endgame",
35    "Data Source: Elastic Defend",
36    "Data Source: Sysmon",
37]
38timestamp_override = "event.ingested"
39type = "eql"
40
41query = '''
42process where host.os.type == "windows" and event.type == "start" and
43  process.args : "?:\\*:*" and process.args_count == 1
44'''
45
46
47[[rule.threat]]
48framework = "MITRE ATT&CK"
49[[rule.threat.technique]]
50id = "T1564"
51name = "Hide Artifacts"
52reference = "https://attack.mitre.org/techniques/T1564/"
53[[rule.threat.technique.subtechnique]]
54id = "T1564.004"
55name = "NTFS File Attributes"
56reference = "https://attack.mitre.org/techniques/T1564/004/"
57
58
59
60[rule.threat.tactic]
61id = "TA0005"
62name = "Defense Evasion"
63reference = "https://attack.mitre.org/tactics/TA0005/"