Persistence via BITS Job Notify Cmdline

An adversary can use the Background Intelligent Transfer Service (BITS) SetNotifyCmdLine method to execute a program that runs after a job finishes transferring data or after a job enters a specified state in order to persist on a system.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2021/12/04"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2023/10/23"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12An adversary can use the Background Intelligent Transfer Service (BITS) SetNotifyCmdLine method to execute a program
13that runs after a job finishes transferring data or after a job enters a specified state in order to persist on a
14system.
15"""
16from = "now-9m"
17index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*", "endgame-*"]
18language = "eql"
19license = "Elastic License v2"
20name = "Persistence via BITS Job Notify Cmdline"
21references = [
22    "https://pentestlab.blog/2019/10/30/persistence-bits-jobs/",
23    "https://docs.microsoft.com/en-us/windows/win32/api/bits1_5/nf-bits1_5-ibackgroundcopyjob2-setnotifycmdline",
24    "https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/bitsadmin-setnotifycmdline",
25    "https://www.elastic.co/blog/hunting-for-persistence-using-elastic-security-part-2",
26]
27risk_score = 47
28rule_id = "c3b915e0-22f3-4bf7-991d-b643513c722f"
29setup = """
30
31If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
32events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
33Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
34`event.ingested` to @timestamp.
35For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
36"""
37severity = "medium"
38tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Persistence", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
39timestamp_override = "event.ingested"
40type = "eql"
41
42query = '''
43process where host.os.type == "windows" and event.type == "start" and
44  process.parent.name : "svchost.exe" and process.parent.args : "BITS" and
45  not process.executable :
46              ("?:\\Windows\\System32\\WerFaultSecure.exe",
47               "?:\\Windows\\System32\\WerFault.exe",
48               "?:\\Windows\\System32\\wermgr.exe",
49               "?:\\WINDOWS\\system32\\directxdatabaseupdater.exe")
50'''
51
52
53[[rule.threat]]
54framework = "MITRE ATT&CK"
55[[rule.threat.technique]]
56id = "T1197"
57name = "BITS Jobs"
58reference = "https://attack.mitre.org/techniques/T1197/"
59
60
61[rule.threat.tactic]
62id = "TA0003"
63name = "Persistence"
64reference = "https://attack.mitre.org/tactics/TA0003/"

References

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