Service DACL Modification via sc.exe

calendar Oct 15, 2024 · Domain: Endpoint OS: Windows Use Case: Threat Detection Tactic: Defense Evasion Resources: Investigation Guide Data Source: Elastic Endgame Data Source: Elastic Defend Data Source: Sysmon Data Source: SentinelOne Data Source: Microsoft Defender for Endpoint  ·
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Identifies DACL modifications to deny access to a service, making it unstoppable, or hide it from system and users.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2024/07/16"
 3integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender"]
 4maturity = "production"
 5min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 6min_stack_version = "8.14.0"
 7updated_date = "2024/10/15"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies DACL modifications to deny access to a service, making it unstoppable, or hide it from system and users.
13"""
14from = "now-9m"
15index = ["winlogbeat-*", "logs-endpoint.events.process-*", "logs-windows.sysmon_operational-*", "endgame-*", "logs-sentinel_one_cloud_funnel.*", "logs-m365_defender.event-*"]
16language = "eql"
17license = "Elastic License v2"
18name = "Service DACL Modification via sc.exe"
19references = [
20  "https://blogs.jpcert.or.jp/en/2024/07/mirrorface-attack-against-japanese-organisations.html",
21  "https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_sc_sdset_deny_service_access.yml",
22  "https://learn.microsoft.com/en-us/windows/win32/secauthz/sid-strings",
23  "https://www.sans.org/blog/red-team-tactics-hiding-windows-services/"
24]
25risk_score = 47
26rule_id = "5188c68e-d3de-4e96-994d-9e242269446f"
27severity = "medium"
28tags = [
29    "Domain: Endpoint",
30    "OS: Windows",
31    "Use Case: Threat Detection",
32    "Tactic: Defense Evasion",
33    "Resources: Investigation Guide",
34    "Data Source: Elastic Endgame",
35    "Data Source: Elastic Defend",
36    "Data Source: Sysmon",
37    "Data Source: SentinelOne",
38    "Data Source: Microsoft Defender for Endpoint"
39]
40timestamp_override = "event.ingested"
41type = "eql"
42
43query = '''
44process where host.os.type == "windows" and event.type == "start" and
45  (process.name : "sc.exe" or ?process.pe.original_file_name : "sc.exe") and
46  process.args : "sdset" and process.args : "*D;*" and
47  process.args : ("*;IU*", "*;SU*", "*;BA*", "*;SY*", "*;WD*")
48'''
49
50
51[[rule.threat]]
52framework = "MITRE ATT&CK"
53[[rule.threat.technique]]
54id = "T1564"
55name = "Hide Artifacts"
56reference = "https://attack.mitre.org/techniques/T1564/"
57
58
59
60[rule.threat.tactic]
61id = "TA0005"
62name = "Defense Evasion"
63reference = "https://attack.mitre.org/tactics/TA0005/"
64
65[[rule.threat]]
66framework = "MITRE ATT&CK"
67[[rule.threat.technique]]
68id = "T1543"
69name = "Create or Modify System Process"
70reference = "https://attack.mitre.org/techniques/T1543/"
71[[rule.threat.technique.subtechnique]]
72id = "T1543.003"
73name = "Windows Service"
74reference = "https://attack.mitre.org/techniques/T1543/003/"
75
76
77
78[rule.threat.tactic]
79id = "TA0003"
80name = "Persistence"
81reference = "https://attack.mitre.org/tactics/TA0003/"

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