Suspicious Execution from INET Cache

 1[metadata]
 2creation_date = "2024/02/14"
 3integration = ["endpoint", "windows", "system"]
 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 the execution of a process with arguments pointing to the INetCache Folder. Adversaries may deliver malicious
13content via WININET during initial access.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.process-*", "logs-windows.*", "endgame-*", "logs-system.security*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Suspicious Execution from INET Cache"
20references = [
21"https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html"
22]
23risk_score = 73
24rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
25severity = "high"
26tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Tactic: Command and Control", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
27timestamp_override = "event.ingested"
28type = "eql"
29
30query = '''
31process where host.os.type == "windows" and event.type == "start" and  
32 process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
33  (process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
34   process.executable : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*")
35'''
36
37
38[[rule.threat]]
39framework = "MITRE ATT&CK"
40[[rule.threat.technique]]
41id = "T1566"
42name = "Phishing"
43reference = "https://attack.mitre.org/techniques/T1566/"
44[[rule.threat.technique.subtechnique]]
45id = "T1566.001"
46name = "Spearphishing Attachment"
47reference = "https://attack.mitre.org/techniques/T1566/001/"
48
49
50[rule.threat.tactic]
51id = "TA0001"
52name = "Initial Access"
53reference = "https://attack.mitre.org/tactics/TA0001/"
54
55
56[[rule.threat]]
57framework = "MITRE ATT&CK"
58[[rule.threat.technique]]
59id = "T1105"
60name = "Ingress Tool Transfer"
61reference = "https://attack.mitre.org/techniques/T1105/"
62
63
64[rule.threat.tactic]
65id = "TA0011"
66name = "Command and Control"
67reference = "https://attack.mitre.org/tactics/TA0011/"