[metadata]
creation_date = "2023/09/27"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2024/01/12"

[rule]
author = ["Elastic"]
description = """
Identifies the execution of a hosted XSL script using the Microsoft.XMLDOM COM interface via Microsoft Office processes. 
This behavior may indicate adversarial activity to execute malicious JScript or VBScript on the system.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Remote XSL Script Execution via COM"
risk_score = 21
rule_id = "48f657ee-de4f-477c-aa99-ed88ee7af97a"
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Tactic: Defense Evasion", "Data Source: Elastic Defend"]
type = "eql"

query = '''
sequence with maxspan=1m
 [library where host.os.type == "windows" and dll.name : "msxml3.dll" and
  process.name : ("winword.exe", "excel.exe", "powerpnt.exe", "mspub.exe")] by process.entity_id
 [process where host.os.type == "windows" and event.action == "start" and
  process.parent.name : ("winword.exe", "excel.exe", "powerpnt.exe", "mspub.exe") and 
  not process.executable :
        ("?:\\Windows\\System32\\WerFault.exe",
         "?:\\Windows\\SysWoW64\\WerFault.exe",
         "?:\\windows\\splwow64.exe",
         "?:\\Windows\\System32\\conhost.exe",
         "?:\\Program Files\\*.exe",
         "?:\\Program Files (x86)\\*exe")] by process.parent.entity_id
'''

[[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 = "T1566.002"
name = "Spearphishing Link"
reference = "https://attack.mitre.org/techniques/T1566/002/"



[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 = "T1220"
name = "XSL Script Processing"
reference = "https://attack.mitre.org/techniques/T1220/"


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