splunk-security_content/detections/endpoint/bitsadmin_download_file.yml

name: BITSAdmin Download File
id: 80630ff4-8e4c-11eb-aab5-acde48001122
version: 4
date: '2024-05-20'
author: Michael Haag, Sittikorn S
status: production
type: TTP
description: The following analytic detects the use of `bitsadmin.exe` with the `transfer`
  parameter to download a remote object. It leverages data from Endpoint Detection
  and Response (EDR) agents, focusing on process and command-line telemetry. This
  activity is significant because `bitsadmin.exe` can be exploited to download and
  execute malicious files without immediate detection. If confirmed malicious, an
  attacker could use this technique to download and execute payloads, potentially
  leading to code execution, privilege escalation, or persistent access within the
  environment. Review parallel and child processes, especially `svchost.exe`, for
  associated artifacts.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where `process_bitsadmin` Processes.process
  IN ("*transfer*", "*addfile*") by Processes.dest Processes.user Processes.parent_process
  Processes.parent_process_name Processes.original_file_name Processes.process_name
  Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `bitsadmin_download_file_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: Limited false positives, however it may be required to filter
  based on parent process name or network connection.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/8eb52117b748d378325f7719554a896e37bccec7/atomics/T1105/T1105.md#atomic-test-9---windows---bitsadmin-bits-download
- https://github.com/redcanaryco/atomic-red-team/blob/bc705cb7aaa5f26f2d96585fac8e4c7052df0ff9/atomics/T1197/T1197.md
- https://docs.microsoft.com/en-us/windows/win32/bits/bitsadmin-tool
- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
tags:
  analytic_story:
  - Ingress Tool Transfer
  - BITS Jobs
  - DarkSide Ransomware
  - Living Off The Land
  - Flax Typhoon
  asset_type: Endpoint
  confidence: 70
  impact: 70
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting to download a file.
  mitre_attack_id:
  - T1197
  - T1105
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.original_file_name
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_path
  - Processes.process_path
  - Processes.parent_process_id
  risk_score: 49
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/crowdstrike_falcon.log
    source: crowdstrike
    sourcetype: crowdstrike:events:sensor