[metadata]
creation_date = "2020/10/27"
maturity = "production"
updated_date = "2021/03/03"

[rule]
author = ["Elastic"]
description = """
Identifies process execution followed by a file overwrite of an executable by the same parent process. This may indicate
an evasion attempt to execute malicious code in a stealthy way.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Potential Process Herpaderping Attempt"
references = ["https://github.com/jxy-s/herpaderping"]
risk_score = 73
rule_id = "ccc55af4-9882-4c67-87b4-449a7ae8079c"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
type = "eql"

query = '''
sequence with maxspan=5s
   [process where event.type == "start" and not process.parent.executable : "C:\\Windows\\SoftwareDistribution\\*.exe"] by host.id, process.executable, process.parent.entity_id
   [file where event.type == "change" and event.action == "overwrite" and file.extension == "exe"] by host.id, file.path, process.entity_id
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1036"
name = "Masquerading"
reference = "https://attack.mitre.org/techniques/T1036/"


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