Suspicious Execution from INET Cache

 1[metadata]
 2creation_date = "2024/02/14"
 3integration = ["endpoint", "windows", "system", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
 4maturity = "production"
 5updated_date = "2024/10/31"
 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    "logs-crowdstrike.fdr*",
26]
27language = "eql"
28license = "Elastic License v2"
29name = "Suspicious Execution from INET Cache"
30references = [
31    "https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html",
32]
33risk_score = 73
34rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
35severity = "high"
36tags = [
37    "Domain: Endpoint",
38    "OS: Windows",
39    "Use Case: Threat Detection",
40    "Tactic: Initial Access",
41    "Tactic: Command and Control",
42    "Data Source: Elastic Endgame",
43    "Data Source: Elastic Defend",
44    "Data Source: System",
45    "Data Source: Microsoft Defender for Endpoint",
46    "Data Source: Sysmon",
47    "Data Source: SentinelOne",
48    "Data Source: Crowdstrike",
49]
50timestamp_override = "event.ingested"
51type = "eql"
52
53query = '''
54process where host.os.type == "windows" and event.type == "start" and  
55  process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
56  (
57    process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
58    process.executable : (
59      "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*",
60      "\\Device\\HarddiskVolume?\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*"
61    )
62  )
63'''
64
65
66[[rule.threat]]
67framework = "MITRE ATT&CK"
68[[rule.threat.technique]]
69id = "T1566"
70name = "Phishing"
71reference = "https://attack.mitre.org/techniques/T1566/"
72[[rule.threat.technique.subtechnique]]
73id = "T1566.001"
74name = "Spearphishing Attachment"
75reference = "https://attack.mitre.org/techniques/T1566/001/"
76
77
78
79[rule.threat.tactic]
80id = "TA0001"
81name = "Initial Access"
82reference = "https://attack.mitre.org/tactics/TA0001/"
83[[rule.threat]]
84framework = "MITRE ATT&CK"
85[[rule.threat.technique]]
86id = "T1105"
87name = "Ingress Tool Transfer"
88reference = "https://attack.mitre.org/techniques/T1105/"
89
90
91[rule.threat.tactic]
92id = "TA0011"
93name = "Command and Control"
94reference = "https://attack.mitre.org/tactics/TA0011/"