Script Execution via MSXSL

[rule]
description = """
Identifies when a Windows Script module is loaded into the Microsoft Core XML Services (MSXML) process. This may
indicate an attempt to bypass application whitelisting by executing a malicious script in a trusted process.
"""
id = "de3615bc-4e50-485e-b3b5-8548ef6faa3d"
license = "Elastic License v2"
name = "Script Execution via MSXSL"
os_list = ["windows"]
reference = ["https://lolbas-project.github.io/lolbas/OtherMSBinaries/Msxsl/"]
version = "1.0.31"

query = '''
sequence by process.entity_id with maxspan=1m
 [process where event.action == "start" and process.pe.original_file_name == "msxsl.exe"]
 [library where dll.name : ("scrobj.dll", "jscript.dll", "vbscript.dll", "jscript9.dll")]
'''

min_endpoint_version = "7.15.0"
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[optional_actions]]
action = "rollback"
field = "process.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.005"
name = "Visual Basic"
reference = "https://attack.mitre.org/techniques/T1059/005/"

[[threat.technique.subtechnique]]
id = "T1059.007"
name = "JavaScript"
reference = "https://attack.mitre.org/techniques/T1059/007/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1220"
name = "XSL Script Processing"
reference = "https://attack.mitre.org/techniques/T1220/"


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

[internal]
min_endpoint_version = "7.15.0"