defense_evasion_msxsl_beacon.toml

[metadata]
creation_date = "2020/09/02"
maturity = "development"
updated_date = "2021/10/13"

[rule]
author = ["Elastic"]
description = """
Identifies MsXsl.exe making outbound network connections. This may indicate adversarial activity as MsXsl is often
leveraged by adversaries to execute malicious scripts and evade detection.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "MsXsl Making Network Connections"
risk_score = 21
rule_id = "870d1753-1078-403e-92d4-735f142edcca"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
type = "eql"

query = '''
/* duplicate of Network Connection via MsXsl - b86afe07-0d98-4738-b15d-8d7465f95ff5 */

sequence by process.entity_id
  [process where event.type in ("start", "process_started") and process.name : "msxsl.exe"]
  [network where process.name : "msxsl.exe" and network.direction : ("outgoing", "egress")]
'''


[[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/"