Windows MOVEit Transfer Writing ASPX

Name:Windows MOVEit Transfer Writing ASPX
id:c0ed2aca-5666-45b3-813f-ddfac3f3eda0
version:3
date:2024-10-17
author:Michael Haag, Splunk
status:experimental
type:TTP
Description:The following analytic detects the creation of new ASPX files in the MOVEit Transfer application's "wwwroot" directory. It leverages endpoint data on process and filesystem activity to identify processes responsible for creating these files. This activity is significant as it may indicate exploitation of a critical zero-day vulnerability in MOVEit Transfer, used by threat actors to install malicious ASPX files. If confirmed malicious, this could lead to exfiltration of sensitive data, including user credentials and file metadata, posing a severe risk to the organization's security.
Data_source:

• -Sysmon EventID 11

search:| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes where Processes.process_name=System by _time span=1h Processes.process_id Processes.process_name Processes.dest
| `drop_dm_object_name(Processes)`
| join process_guid, _time [| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_path IN ("*\\MOVEitTransfer\\wwwroot\\*") Filesystem.file_name IN("*.aspx", "*.ashx", "*.asp*") OR Filesystem.file_name IN ("human2.aspx","_human2.aspx") by _time span=1h Filesystem.dest Filesystem.file_create_time Filesystem.file_name Filesystem.file_path
| `drop_dm_object_name(Filesystem)`
| fields _time dest file_create_time file_name file_path process_name process_path process]
| dedup file_create_time
| table dest file_create_time, file_name, file_path, process_name
| `windows_moveit_transfer_writing_aspx_filter`

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 and `Filesystem` node.
known_false_positives:The query is structured in a way that `action` (read, create) is not defined. Review the results of this query, filter, and tune as necessary. It may be necessary to generate this query specific to your endpoint product.
References:
  -https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023
  -https://www.reddit.com/r/sysadmin/comments/13wxuej/critical_vulnerability_moveit_file_transfer/
  -https://www.bleepingcomputer.com/news/security/new-moveit-transfer-zero-day-mass-exploited-in-data-theft-attacks/
  -https://www.reddit.com/r/sysadmin/comments/13wxuej/critical_vulnerability_moveit_file_transfer/
  -https://www.mandiant.com/resources/blog/zero-day-moveit-data-theft
drilldown_searches:
  :
tags:
  analytic_story:
    - 'MOVEit Transfer Critical Vulnerability'
  asset_type:Endpoint
  atomic_guid:
  confidence:100
  impact:100
  message:The MOVEit application on $dest$ has written a new ASPX file to disk.
  mitre_attack_id:
    - 'T1190'
    - 'T1133'
  observable:
    name:'dest'
    type:'Hostname'
    - role:
      - 'Victim'
  product:
    - 'Splunk Enterprise'
    - 'Splunk Enterprise Security'
    - 'Splunk Cloud'
  risk_score:100
  required_fields:
    - '_time'
    - 'Filesystem.file_path'
    - 'Filesystem.process_id'
    - 'Filesystem.file_name'
    - 'Filesystem.file_hash'
    - 'Filesystem.user'
    - 'Filesystem.file_create_time'
    - 'Processes.process_id'
    - 'Processes.process_name'
    - 'Processes.dest'
  security_domain:endpoint

tests:
 name:'True Positive Test'
 attack_data:
  data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1505.003/moveit_windows-sysmon.log
  source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
  sourcetype: XmlWinEventLog
manual_test:None