defense_evasion_hide_encoded_executable_registry.toml

[metadata]
creation_date = "2020/11/25"
maturity = "production"
updated_date = "2022/02/14"

[rule]
author = ["Elastic"]
description = """
Identifies registry write modifications to hide an encoded portable executable. This could be indicative of adversary
defense evasion by avoiding the storing of malicious content directly on disk.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Encoded Executable Stored in the Registry"
risk_score = 47
rule_id = "93c1ce76-494c-4f01-8167-35edfb52f7b1"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where
/* update here with encoding combinations */
 registry.data.strings : "TVqQAAMAAAAEAAAA*"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1140"
name = "Deobfuscate/Decode Files or Information"
reference = "https://attack.mitre.org/techniques/T1140/"
[[rule.threat.technique]]
id = "T1112"
name = "Modify Registry"
reference = "https://attack.mitre.org/techniques/T1112/"

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