mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
P4T12ICK
95 lines
3.7 KiB
YAML
95 lines
3.7 KiB
YAML
name: Windows MSHTA Command-Line URL
|
|
id: 9b35c538-94ef-11ec-9439-acde48001122
|
|
version: 1
|
|
date: '2022-02-23'
|
|
author: Michael Haag, Splunk
|
|
type: TTP
|
|
datamodel:
|
|
- Endpoint_Processes
|
|
description: This analytic identifies when Microsoft HTML Application Host (mshta.exe)
|
|
utility is used to make remote http connections. Adversaries may use mshta.exe to
|
|
proxy the download and execution of remote .hta files. The analytic identifies command
|
|
line arguments of http and https being used. This technique is commonly used by
|
|
malicious software to bypass preventative controls. 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, process "rundll32.exe" and its parent 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=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 | where process_name="mshta.exe"
|
|
AND (like (cmd_line, "%http://%") OR like (cmd_line, "%https://%")) | 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 information
|
|
on process that include the name of the process responsible for the changes from
|
|
your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
|
|
confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
|
|
endpoint product.
|
|
known_false_positives: It is possible legitimate applications may perform this behavior
|
|
and will need to be filtered.
|
|
references:
|
|
- https://github.com/redcanaryco/AtomicTestHarnesses
|
|
- https://redcanary.com/blog/introducing-atomictestharnesses/
|
|
- https://docs.microsoft.com/en-us/windows/win32/search/-search-3x-wds-extidx-prot-implementing
|
|
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
|