splunk-security_content/detections/endpoint/bits_job_persistence.yml

name: BITS Job Persistence
id: e97a5ffe-90bf-11eb-928a-acde48001122
version: 2
date: '2021-09-16'
author: Michael Haag, Splunk
type: TTP
datamodel:
- Endpoint
description: The following query identifies Microsoft Background Intelligent Transfer
  Service utility `bitsadmin.exe` scheduling a BITS job to persist on an endpoint.
  The query identifies the parameters used to create, resume or add a file to a BITS
  job. Typically seen combined in a oneliner or ran in sequence. If identified, review
  the BITS job created and capture any files written to disk. It is possible for BITS
  to be used to upload files and this may require further network data analysis to
  identify. You can use `bitsadmin /list /verbose` to list out the jobs during investigation.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where `process_bitsadmin` Processes.process
  IN (*create*, *addfile*, *setnotifyflags*, *setnotifycmdline*, *setminretrydelay*,
  *setcustomheaders*, *resume* ) by Processes.dest Processes.user Processes.original_file_name
  Processes.parent_process 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)` | `bits_job_persistence_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. In addition,
  confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
  endpoint product.
known_false_positives: Limited false positives will be present. Typically, applications
  will use `BitsAdmin.exe`. Any filtering should be done based on command-line arguments
  (legitimate applications) or parent process.
references:
- https://attack.mitre.org/techniques/T1197/
- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/bitsadmin
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1197/T1197.md#atomic-test-3---persist-download--execute
- https://lolbas-project.github.io/lolbas/Binaries/Bitsadmin/
tags:
  analytic_story:
  - BITS Jobs
  - Living Off The Land
  confidence: 80
  context:
  - Source:Endpoint
  - Stage:Persistence
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/windows-sysmon.log
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/crowdstrike_falcon.log
  impact: 70
  kill_chain_phases:
  - Exploitation
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting to persist using BITS.
  mitre_attack_id:
  - T1197
  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: 56
  security_domain: endpoint
  supported_tas:
  - Splunk_TA_microsoft_sysmon
  asset_type: Endpoint