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Description

The following analytic identifies MSIExec with any network connection over port 443 or 80. Typically, MSIExec does not perform network communication to the internet.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2022-06-16
  • Author: Michael Haag, Splunk
  • ID: 827409a1-5393-4d8d-8da4-bbb297c262a7

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1218.007 Msiexec Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE 


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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes where `process_msiexec` by _time Processes.process_id Processes.process_name Processes.dest Processes.process_path Processes.process Processes.parent_process_name 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| join  process_id [
| tstats `security_content_summariesonly` count FROM datamodel=Network_Traffic.All_Traffic where All_Traffic.dest_port IN ("80","443") by All_Traffic.process_id All_Traffic.dest All_Traffic.dest_port All_Traffic.dest_ip 
| `drop_dm_object_name(All_Traffic)` ] 
| table _time dest parent_process_name process_name process_path process process_id dest_port dest_ip 
| `windows_msiexec_with_network_connections_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_msiexec_with_network_connections_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • Processes.process_id
  • Processes.process_name
  • Processes.dest
  • Processes.process_path
  • Processes.process
  • Processes.parent_process_name
  • All_Traffic.process_id
  • All_Traffic.dest
  • All_Traffic.dest_port
  • All_Traffic.dest_ip

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. Add parent process as a filter, filter known good processes. This may be voluminous due to the join on process_id. All_Traffic does not have process_guid, yet.

Known False Positives

False positives will be present and filtering is required.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
35.0 70 50 An instance of $process_name$ was identified on endpoint $dest$ contacting a remote destination.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1