[metadata]
creation_date = "2023/01/17"
integration = ["windows"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/12/18"

[rule]
author = ["Elastic"]
description = """
Identifies modification of a file creation time. Adversaries may modify file time attributes to blend
malicious content with existing files. Timestomping is a technique that modifies the timestamps of 
a file often to mimic files that are in trusted directories.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "File Creation Time Changed"
risk_score = 47
rule_id = "166727ab-6768-4e26-b80c-948b228ffc06"
severity = "medium"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Defense Evasion"
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
file where host.os.type == "windows" and event.code : "2" and

 /* Requires Sysmon EventID 2 - File creation time change */
 event.action : "File creation time changed*" and 
 
 not process.executable : 
          ("?:\\Program Files\\*", 
           "?:\\Program Files (x86)\\*", 
           "?:\\Windows\\system32\\cleanmgr.exe",
           "?:\\Windows\\system32\\msiexec.exe", 
           "?:\\Windows\\syswow64\\msiexec.exe", 
           "?:\\Windows\\system32\\svchost.exe", 
           "?:\\WINDOWS\\system32\\backgroundTaskHost.exe",
           "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", 
           "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe",
           "?:\\Users\\*\\AppData\\Local\\slack\\app-*\\slack.exe", 
           "?:\\Users\\*\\AppData\\Local\\GitHubDesktop\\app-*\\GitHubDesktop.exe",
           "?:\\Users\\*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams.exe", 
           "?:\\Users\\*\\AppData\\Local\\Microsoft\\OneDrive\\OneDrive.exe") and 
 not file.extension : ("temp", "tmp", "~tmp", "xml", "newcfg") and not user.name : ("SYSTEM", "Local Service", "Network Service") and
 not file.name : ("LOG", "temp-index", "license.rtf", "iconcache_*.db")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1070"
name = "Indicator Removal"
reference = "https://attack.mitre.org/techniques/T1070/"
[[rule.threat.technique.subtechnique]]
id = "T1070.006"
name = "Timestomp"
reference = "https://attack.mitre.org/techniques/T1070/006/"


[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"