security_content/detections/endpoint/windows_msiexec_remote_download.yml at 76a9a02c9e7826721e8867d5838c84a7768d068c · splunk/security_content · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
name: Windows MSIExec Remote Download
id: 6aa49ff2-3c92-4586-83e0-d83eb693dfda
version: 6
date: '2024-11-13'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic detects the use of msiexec.exe with an HTTP or
  HTTPS URL in the command line, indicating a remote file download attempt. This detection
  leverages data from Endpoint Detection and Response (EDR) agents, focusing on process
  execution logs that include command-line details. This activity is significant as
  it may indicate an attempt to download and execute potentially malicious software
  from a remote server. If confirmed malicious, this could lead to unauthorized code
  execution, system compromise, or further malware deployment within the network.
data_source:
- Sysmon EventID 1
- Windows Event Log Security 4688
- CrowdStrike ProcessRollup2
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where `process_msiexec` Processes.process
  IN ("*http://*", "*https://*") by Processes.dest Processes.user Processes.parent_process_name
  Processes.process_name Processes.original_file_name Processes.process Processes.process_id
  Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `windows_msiexec_remote_download_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: False positives may be present, filter by destination or parent
  process as needed.
references:
- https://thedfirreport.com/2022/06/06/will-the-real-msiexec-please-stand-up-exploit-leads-to-data-exfiltration/
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1218.007/T1218.007.md
drilldown_searches:
- name: View the detection results for - "$user$" and "$dest$"
  search: '%original_detection_search% | search  user = "$user$" dest = "$dest$"'
  earliest_offset: $info_min_time$
  latest_offset: $info_max_time$
- name: View risk events for the last 7 days for - "$user$" and "$dest$"
  search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$",
    "$dest$") starthoursago=168  | stats count min(_time) as firstTime max(_time)
    as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
    Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
    as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
    by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
  earliest_offset: $info_min_time$
  latest_offset: $info_max_time$
rba:
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting to download a remote file.
  risk_objects:
  - field: user
    type: user
    score: 35
  - field: dest
    type: system
    score: 35
  threat_objects:
  - field: parent_process_name
    type: parent_process_name
  - field: process_name
    type: process_name
tags:
  analytic_story:
  - Windows System Binary Proxy Execution MSIExec
  asset_type: Endpoint
  mitre_attack_id:
  - T1218.007
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data:
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.007/atomic_red_team/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: XmlWinEventLog