mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
63 lines
2.3 KiB
YAML
63 lines
2.3 KiB
YAML
name: Windows PowerShell Start-BitsTransfer
|
|
id: 0bafd086-8f61-11ec-996e-acde48001122
|
|
version: 5
|
|
date: '2022-02-16'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: Start-BitsTransfer is the PowerShell "version" of BitsAdmin.exe. Similar
|
|
functionality is present. This technique variation is not as commonly used by adversaries,
|
|
but has been abused in the past. Lesser known uses include the ability to set the
|
|
`-TransferType` to `Upload` for exfiltration of files. In an instance where `Upload`
|
|
is used, it is highly possible files will be archived. During triage, review parallel
|
|
processes and process lineage. Capture any files on disk and review. For the remote
|
|
domain or IP, what is the reputation?
|
|
data_source:
|
|
- Windows Security 4688
|
|
search:
|
|
selection1:
|
|
process.file.name:
|
|
- powershell_ise.exe
|
|
- powershell.exe
|
|
- sqltoolsps.exe
|
|
- sqlps.exe
|
|
- pwsh.exe
|
|
- pwsh.exe
|
|
selection2:
|
|
process.cmd_line|re: start-bitstransfer
|
|
condition: selection1 and selection2
|
|
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_Processess` datamodel.
|
|
known_false_positives: Limited false positives. It is possible administrators will
|
|
utilize Start-BitsTransfer for administrative tasks, otherwise filter based parent
|
|
process or command-line arguments.
|
|
references:
|
|
- https://isc.sans.edu/diary/Investigating+Microsoft+BITS+Activity/23281
|
|
- https://docs.microsoft.com/en-us/windows/win32/bits/using-windows-powershell-to-create-bits-transfer-jobs
|
|
tags:
|
|
analytic_story:
|
|
- BITS Jobs
|
|
- Living Off The Land
|
|
asset_type: Endpoint
|
|
confidence: 70
|
|
impact: 70
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$ by user $dest_user_id$ attempting to download a file.
|
|
mitre_attack_id:
|
|
- T1197
|
|
- T1105
|
|
observable: []
|
|
product:
|
|
- Splunk Behavioral Analytics
|
|
required_fields: []
|
|
kill_chain_phases:
|
|
- Exploitation
|
|
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/T1197_windows-security.log
|
|
source: WinEventLog:Security
|