mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
83 lines
3.5 KiB
YAML
83 lines
3.5 KiB
YAML
name: Winword Spawning Windows Script Host
|
|
id: 637e1b5c-9be1-11eb-9c32-acde48001122
|
|
version: 1
|
|
date: '2021-04-12'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following detection identifies Microsoft Winword.exe spawning Windows
|
|
Script Host - `cscript.exe` or `wscript.exe`. Typically, this is not common behavior
|
|
and not default with Winword.exe. Winword.exe will generally be found in the following
|
|
path `C:\Program Files\Microsoft Office\root\Office16` (version will vary). `cscript.exe`
|
|
or `wscript.exe` default location is `c:\windows\system32\` or c:windows\syswow64\`.
|
|
`cscript.exe` or `wscript.exe` spawning from Winword.exe is common for a spearphishing
|
|
attachment and is actively used. Albeit, the command-line executed will most likely
|
|
be obfuscated and captured via another detection. During triage, review parallel
|
|
processes and identify any files that may have been written. Review the reputation
|
|
of the remote destination and block accordingly.
|
|
data_source:
|
|
- Sysmon Event ID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name="winword.exe"
|
|
Processes.process_name IN ("cscript.exe", "wscript.exe") by Processes.dest Processes.user
|
|
Processes.parent_process Processes.process_name Processes.process Processes.process_id
|
|
Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)` | `winword_spawning_windows_script_host_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
known_false_positives: There will be limited false positives and it will be different
|
|
for every environment. Tune by child process or command-line as needed.
|
|
references:
|
|
- https://attack.mitre.org/techniques/T1566/001/
|
|
tags:
|
|
analytic_story:
|
|
- Spearphishing Attachments
|
|
- CVE-2023-21716 Word RTF Heap Corruption
|
|
asset_type: Endpoint
|
|
confidence: 100
|
|
impact: 70
|
|
message: User $user$ on $dest$ spawned Windows Script Host from Winword.exe
|
|
mitre_attack_id:
|
|
- T1566
|
|
- T1566.001
|
|
observable:
|
|
- name: dest
|
|
type: Endpoint
|
|
role:
|
|
- Victim
|
|
- name: user
|
|
type: User
|
|
role:
|
|
- Victim
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Target
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- process_name
|
|
- process_id
|
|
- parent_process_name
|
|
- dest
|
|
- user
|
|
- parent_process_id
|
|
risk_score: 70
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon_wsh.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: xmlwineventlog
|