Suspicious Print Spooler File Deletion

 1[metadata]
 2creation_date = "2021/07/06"
 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 = """
12Detects deletion of print driver files by an unusual process. This may indicate a clean up attempt post successful
13privilege escalation via Print Spooler service related vulnerabilities.
14"""
15false_positives = [
16    """
17    Uninstall or manual deletion of a legitimate printing driver files. Verify the printer file metadata such as
18    manufacturer and signature information.
19    """,
20]
21from = "now-9m"
22index = ["winlogbeat-*", "logs-endpoint.events.file-*", "logs-windows.sysmon_operational-*", "endgame-*"]
23language = "eql"
24license = "Elastic License v2"
25name = "Suspicious Print Spooler File Deletion"
26references = ["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527"]
27risk_score = 47
28rule_id = "c4818812-d44f-47be-aaef-4cfb2f9cc799"
29setup = """## Setup
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: Privilege Escalation", "Data Source: Elastic Endgame", "Use Case: Vulnerability", "Data Source: Elastic Defend", "Data Source: Sysmon"]
39timestamp_override = "event.ingested"
40type = "eql"
41
42query = '''
43file where host.os.type == "windows" and event.type : "deletion" and
44 not process.name : ("spoolsv.exe", "dllhost.exe", "explorer.exe") and
45 file.path : "?:\\Windows\\System32\\spool\\drivers\\x64\\3\\*.dll"
46'''
47
48
49[[rule.threat]]
50framework = "MITRE ATT&CK"
51[[rule.threat.technique]]
52id = "T1068"
53name = "Exploitation for Privilege Escalation"
54reference = "https://attack.mitre.org/techniques/T1068/"
55
56
57[rule.threat.tactic]
58id = "TA0004"
59name = "Privilege Escalation"
60reference = "https://attack.mitre.org/tactics/TA0004/"