splunk-security_content/detections/endpoint/bitsadmin_download_file.yml

name: BITSAdmin Download File
id: 80630ff4-8e4c-11eb-aab5-acde48001122
version: 3
date: '2022-11-29'
author: Michael Haag, Sittikorn S
status: production
type: TTP
description: The following query identifies Microsoft Background Intelligent Transfer
  Service utility `bitsadmin.exe` using the `transfer` parameter to download a remote
  object. In addition, look for `download` or `upload` on the command-line, the switches
  are not required to perform a transfer. Capture any files downloaded. Review the
  reputation of the IP or domain used. Typically once executed, a follow on command
  will be used to execute the dropped file. Note that the network connection or file
  modification events related will not spawn or create from `bitsadmin.exe`, but the
  artifacts will appear in a parallel process of `svchost.exe` with a command-line
  similar to `svchost.exe -k netsvcs -s BITS`. It's important to review all parallel
  and child processes to capture any behaviors and artifacts. In some suspicious and
  malicious instances, BITS jobs will be created. You can use `bitsadmin /list /verbose`
  to list out the jobs during investigation.
data_source:
- Sysmon Event ID 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