mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Lou Stella
93 lines
3.5 KiB
YAML
93 lines
3.5 KiB
YAML
name: Windows MSHTA Child Process
|
|
id: f63f7e9c-9526-11ec-9fc7-acde48001122
|
|
version: 2
|
|
date: '2022-02-23'
|
|
author: Michael Haag, Splunk
|
|
type: TTP
|
|
datamodel:
|
|
- Endpoint_Processes
|
|
description: The following analytic identifies child processes spawning from "mshta.exe".
|
|
The search will return the first time and last time these command-line arguments
|
|
were used for these executions, as well as the target system, the user, parent process
|
|
"mshta.exe" and its child process.
|
|
search: '| from read_ssa_enriched_events() | eval timestamp=parse_long(ucast(map_get(input_event,
|
|
"_time"), "string", null)), cmd_line=lower(ucast(map_get(input_event, "process"),
|
|
"string", null)), process_name=lower(ucast(map_get(input_event, "process_name"),
|
|
"string", null)), process_path=ucast(map_get(input_event, "process_path"), "string",
|
|
null), parent_process_name=lower(ucast(map_get(input_event, "parent_process_name"), "string",
|
|
null)), event_id=ucast(map_get(input_event, "event_id"), "string", null) | where
|
|
cmd_line IS NOT NULL AND process_name IS NOT NULL AND parent_process_name IS NOT
|
|
NULL | where like(parent_process_name, "%\\\\mshta.exe") AND (process_name="powershell.exe" OR
|
|
process_name="cmd.exe" OR process_name="scrcons.exe" OR process_name="colorcpl.exe"
|
|
OR process_name="msbuild.exe" OR process_name="microsoft.workflow.compiler.exe"
|
|
OR process_name="searchprotocolhost.exe" OR process_name="cscript.exe" OR process_name="wscript.exe")
|
|
| eval start_time=timestamp, end_time=timestamp, entities=mvappend(ucast(map_get(input_event,
|
|
"dest_user_id"), "string", null), ucast(map_get(input_event, "dest_device_id"),
|
|
"string", null)), body=create_map(["event_id", event_id, "cmd_line", cmd_line, "process_name",
|
|
process_name, "parent_process_name", parent_process_name, "process_path", process_path])
|
|
| into write_ssa_detected_events();'
|
|
how_to_implement: To successfully implement this search, you need to be ingesting
|
|
logs with the process name, parent process, and command-line executions from your
|
|
endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
|
|
Sysmon TA.
|
|
known_false_positives: Although unlikely, some legitimate applications may exhibit
|
|
this behavior, triggering a false positive.
|
|
references:
|
|
- https://github.com/redcanaryco/AtomicTestHarnesses
|
|
- https://redcanary.com/blog/introducing-atomictestharnesses/
|
|
tags:
|
|
analytic_story:
|
|
- Suspicious MSHTA Activity
|
|
- Living Off The Land
|
|
cis20:
|
|
- CIS 8
|
|
confidence: 100
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Defense Evasion
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.005/atomic_red_team/windows-security.log
|
|
impact: 80
|
|
kill_chain_phases:
|
|
- Exploitation
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest_device_id$ by user $dest_user_id$ attempting to access a remote
|
|
destination to download an additional payload.
|
|
mitre_attack_id:
|
|
- T1218.005
|
|
- T1218
|
|
nist:
|
|
- PR.PT
|
|
- DE.CM
|
|
observable:
|
|
- name: dest_user_id
|
|
type: User
|
|
role:
|
|
- Victim
|
|
- name: dest_device_id
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: parent_process_name
|
|
type: Process
|
|
role:
|
|
- Parent Process
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Child Process
|
|
product:
|
|
- Splunk Behavioral Analytics
|
|
required_fields:
|
|
- _time
|
|
- dest_device_id
|
|
- process_name
|
|
- parent_process_name
|
|
- process_path
|
|
- dest_user_id
|
|
- process
|
|
- cmd_line
|
|
risk_score: 80
|
|
security_domain: endpoint
|
|
asset_type: Endpoint
|