Suspicious Execution from INET Cache

 1[metadata]
 2creation_date = "2024/02/14"
 3integration = ["endpoint", "windows", "system", "m365_defender", "sentinel_one_cloud_funnel"]
 4maturity = "production"
 5updated_date = "2024/10/15"
 6min_stack_version = "8.14.0"
 7min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 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 = [
17    "winlogbeat-*",
18    "logs-endpoint.events.process-*",
19    "logs-windows.forwarded*",
20    "logs-windows.sysmon_operational-*",
21    "endgame-*",
22    "logs-system.security*",
23    "logs-m365_defender.event-*",
24    "logs-sentinel_one_cloud_funnel.*",
25]
26language = "eql"
27license = "Elastic License v2"
28name = "Suspicious Execution from INET Cache"
29references = [
30    "https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html",
31]
32risk_score = 73
33rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
34severity = "high"
35tags = [
36    "Domain: Endpoint",
37    "OS: Windows",
38    "Use Case: Threat Detection",
39    "Tactic: Initial Access",
40    "Tactic: Command and Control",
41    "Data Source: Elastic Endgame",
42    "Data Source: Elastic Defend",
43    "Data Source: System",
44    "Data Source: Microsoft Defender for Endpoint",
45    "Data Source: Sysmon",
46    "Data Source: SentinelOne",
47]
48timestamp_override = "event.ingested"
49type = "eql"
50
51query = '''
52process where host.os.type == "windows" and event.type == "start" and  
53 process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
54  (process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
55   process.executable : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*")
56'''
57
58
59[[rule.threat]]
60framework = "MITRE ATT&CK"
61[[rule.threat.technique]]
62id = "T1566"
63name = "Phishing"
64reference = "https://attack.mitre.org/techniques/T1566/"
65[[rule.threat.technique.subtechnique]]
66id = "T1566.001"
67name = "Spearphishing Attachment"
68reference = "https://attack.mitre.org/techniques/T1566/001/"
69
70
71
72[rule.threat.tactic]
73id = "TA0001"
74name = "Initial Access"
75reference = "https://attack.mitre.org/tactics/TA0001/"
76[[rule.threat]]
77framework = "MITRE ATT&CK"
78[[rule.threat.technique]]
79id = "T1105"
80name = "Ingress Tool Transfer"
81reference = "https://attack.mitre.org/techniques/T1105/"
82
83
84[rule.threat.tactic]
85id = "TA0011"
86name = "Command and Control"
87reference = "https://attack.mitre.org/tactics/TA0011/"