[metadata]
creation_date = "2024/02/14"
integration = ["endpoint", "windows", "system", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
maturity = "production"
updated_date = "2024/10/31"
min_stack_version = "8.14.0"
min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."

[rule]
author = ["Elastic"]
description = """
Identifies the execution of a process with arguments pointing to the INetCache Folder. Adversaries may deliver malicious
content via WININET during initial access.
"""
from = "now-9m"
index = [
    "winlogbeat-*",
    "logs-endpoint.events.process-*",
    "logs-windows.forwarded*",
    "logs-windows.sysmon_operational-*",
    "endgame-*",
    "logs-system.security*",
    "logs-m365_defender.event-*",
    "logs-sentinel_one_cloud_funnel.*",
    "logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
name = "Suspicious Execution from INET Cache"
references = [
    "https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html",
]
risk_score = 73
rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
severity = "high"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Initial Access",
    "Tactic: Command and Control",
    "Data Source: Elastic Endgame",
    "Data Source: Elastic Defend",
    "Data Source: System",
    "Data Source: Microsoft Defender for Endpoint",
    "Data Source: Sysmon",
    "Data Source: SentinelOne",
    "Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where host.os.type == "windows" and event.type == "start" and  
  process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
  (
    process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
    process.executable : (
      "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*",
      "\\Device\\HarddiskVolume?\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*"
    )
  )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1566"
name = "Phishing"
reference = "https://attack.mitre.org/techniques/T1566/"
[[rule.threat.technique.subtechnique]]
id = "T1566.001"
name = "Spearphishing Attachment"
reference = "https://attack.mitre.org/techniques/T1566/001/"



[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1105"
name = "Ingress Tool Transfer"
reference = "https://attack.mitre.org/techniques/T1105/"


[rule.threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"