Potential LSASS Memory Dump via PssCaptureSnapShot

 1[metadata]
 2creation_date = "2021/10/14"
 3integration = ["windows"]
 4maturity = "production"
 5min_stack_comments = "Build time field required_fields divergence between -8.7 and 8.8+ due to schema versions."
 6min_stack_version = "8.8.0"
 7updated_date = "2024/03/08"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies suspicious access to an LSASS handle via PssCaptureSnapShot where two successive process accesses are
13performed by the same process and target two different instances of LSASS. This may indicate an attempt to evade
14detection and dump LSASS memory for credential access.
15"""
16from = "now-9m"
17index = ["winlogbeat-*", "logs-windows.sysmon_operational-*"]
18language = "kuery"
19license = "Elastic License v2"
20name = "Potential LSASS Memory Dump via PssCaptureSnapShot"
21references = [
22    "https://www.matteomalvica.com/blog/2019/12/02/win-defender-atp-cred-bypass/",
23    "https://twitter.com/sbousseaden/status/1280619931516747777?lang=en",
24]
25risk_score = 73
26rule_id = "0f93cb9a-1931-48c2-8cd0-f173fd3e5283"
27setup = """## Setup
28
29This is meant to run only on datasources using Elastic Agent 7.14+ since versions prior to that will be missing the threshold
30rule cardinality feature.
31"""
32severity = "high"
33tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Credential Access", "Data Source: Sysmon"]
34timestamp_override = "event.ingested"
35type = "threshold"
36
37query = '''
38event.category:process and host.os.type:windows and event.code:10 and
39 winlog.event_data.TargetImage:("C:\\Windows\\system32\\lsass.exe" or
40                                 "c:\\Windows\\system32\\lsass.exe" or
41                                 "c:\\Windows\\System32\\lsass.exe")
42'''
43
44
45[[rule.threat]]
46framework = "MITRE ATT&CK"
47[[rule.threat.technique]]
48id = "T1003"
49name = "OS Credential Dumping"
50reference = "https://attack.mitre.org/techniques/T1003/"
51[[rule.threat.technique.subtechnique]]
52id = "T1003.001"
53name = "LSASS Memory"
54reference = "https://attack.mitre.org/techniques/T1003/001/"
55
56
57
58[rule.threat.tactic]
59id = "TA0006"
60name = "Credential Access"
61reference = "https://attack.mitre.org/tactics/TA0006/"
62
63[rule.threshold]
64field = ["process.entity_id"]
65value = 2
66[[rule.threshold.cardinality]]
67field = "winlog.event_data.TargetProcessId"
68value = 2