Suspicious Execution from INET Cache

 1[metadata]
 2creation_date = "2024/02/14"
 3integration = ["endpoint", "windows", "system"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies the execution of a process with arguments pointing to the INetCache Folder. Adversaries may deliver malicious
11content via WININET during initial access.
12"""
13from = "now-9m"
14index = [
15    "winlogbeat-*",
16    "logs-endpoint.events.process-*",
17    "logs-windows.*",
18    "endgame-*",
19    "logs-system.security*",
20]
21language = "eql"
22license = "Elastic License v2"
23name = "Suspicious Execution from INET Cache"
24references = [
25    "https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html",
26]
27risk_score = 73
28rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
29severity = "high"
30tags = [
31    "Domain: Endpoint",
32    "OS: Windows",
33    "Use Case: Threat Detection",
34    "Tactic: Initial Access",
35    "Tactic: Command and Control",
36    "Data Source: Elastic Endgame",
37    "Data Source: Elastic Defend",
38]
39timestamp_override = "event.ingested"
40type = "eql"
41
42query = '''
43process where host.os.type == "windows" and event.type == "start" and  
44 process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
45  (process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
46   process.executable : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*")
47'''
48
49
50[[rule.threat]]
51framework = "MITRE ATT&CK"
52[[rule.threat.technique]]
53id = "T1566"
54name = "Phishing"
55reference = "https://attack.mitre.org/techniques/T1566/"
56[[rule.threat.technique.subtechnique]]
57id = "T1566.001"
58name = "Spearphishing Attachment"
59reference = "https://attack.mitre.org/techniques/T1566/001/"
60
61
62
63[rule.threat.tactic]
64id = "TA0001"
65name = "Initial Access"
66reference = "https://attack.mitre.org/tactics/TA0001/"
67[[rule.threat]]
68framework = "MITRE ATT&CK"
69[[rule.threat.technique]]
70id = "T1105"
71name = "Ingress Tool Transfer"
72reference = "https://attack.mitre.org/techniques/T1105/"
73
74
75[rule.threat.tactic]
76id = "TA0011"
77name = "Command and Control"
78reference = "https://attack.mitre.org/tactics/TA0011/"