Encoded Executable Stored in the Registry

 1[metadata]
 2creation_date = "2020/11/25"
 3integration = ["endpoint"]
 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 = """
12Identifies registry write modifications to hide an encoded portable executable. This could be indicative of adversary
13defense evasion by avoiding the storing of malicious content directly on disk.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.registry-*", "endgame-*", "logs-windows.sysmon_operational-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Encoded Executable Stored in the Registry"
20risk_score = 47
21rule_id = "93c1ce76-494c-4f01-8167-35edfb52f7b1"
22severity = "medium"
23tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend", "Data Source: Sysmon"]
24timestamp_override = "event.ingested"
25type = "eql"
26
27query = '''
28registry where host.os.type == "windows" and
29/* update here with encoding combinations */
30 registry.data.strings : "TVqQAAMAAAAEAAAA*"
31'''
32
33
34[[rule.threat]]
35framework = "MITRE ATT&CK"
36[[rule.threat.technique]]
37id = "T1112"
38name = "Modify Registry"
39reference = "https://attack.mitre.org/techniques/T1112/"
40
41[[rule.threat.technique]]
42id = "T1140"
43name = "Deobfuscate/Decode Files or Information"
44reference = "https://attack.mitre.org/techniques/T1140/"
45
46
47[rule.threat.tactic]
48id = "TA0005"
49name = "Defense Evasion"
50reference = "https://attack.mitre.org/tactics/TA0005/"