Unusual Process Execution Path - Alternate Data Stream

 1[metadata]
 2creation_date = "2020/12/04"
 3integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
 4maturity = "production"
 5updated_date = "2024/10/31"
 6min_stack_version = "8.14.0"
 7min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 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-*", "logs-m365_defender.event-*", "logs-sentinel_one_cloud_funnel.*", "logs-crowdstrike.fdr*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Unusual Process Execution Path - Alternate Data Stream"
20risk_score = 47
21rule_id = "4bd1c1af-79d4-4d37-9efa-6e0240640242"
22severity = "medium"
23tags = [
24    "Domain: Endpoint",
25    "OS: Windows",
26    "Use Case: Threat Detection",
27    "Tactic: Defense Evasion",
28    "Data Source: Elastic Endgame",
29    "Data Source: Elastic Defend",
30    "Data Source: Sysmon",
31    "Data Source: Microsoft Defender for Endpoint",
32    "Data Source: SentinelOne",
33    "Data Source: Crowdstrike",
34]
35timestamp_override = "event.ingested"
36type = "eql"
37
38query = '''
39process where host.os.type == "windows" and event.type == "start" and
40  process.args : "?:\\*:*" and process.args_count == 1
41'''
42
43
44[[rule.threat]]
45framework = "MITRE ATT&CK"
46[[rule.threat.technique]]
47id = "T1564"
48name = "Hide Artifacts"
49reference = "https://attack.mitre.org/techniques/T1564/"
50[[rule.threat.technique.subtechnique]]
51id = "T1564.004"
52name = "NTFS File Attributes"
53reference = "https://attack.mitre.org/techniques/T1564/004/"
54
55
56
57[rule.threat.tactic]
58id = "TA0005"
59name = "Defense Evasion"
60reference = "https://attack.mitre.org/tactics/TA0005/"