sigma-rules/rules/windows/defense_evasion_hide_encoded_executable_registry.toml

[metadata]
creation_date = "2020/11/25"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/06/22"

[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.*", "endgame-*"]
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 = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where host.os.type == "windows" and
/* update here with encoding combinations */
 registry.data.strings : "TVqQAAMAAAAEAAAA*"
'''


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

[[rule.threat.technique]]
id = "T1140"
name = "Deobfuscate/Decode Files or Information"
reference = "https://attack.mitre.org/techniques/T1140/"


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