Suspicious Bitstransfer via PowerShell

SIGMA detection rule by Austin Songer @austinsonger · NOASSERTION

Detects transferring files from system on a server bitstransfer Powershell cmdlets

title: Suspicious Bitstransfer via PowerShell
id: cd5c8085-4070-4e22-908d-a5b3342deb74
status: deprecated
description: Detects transferring files from system on a server bitstransfer Powershell cmdlets
references:
    - https://docs.microsoft.com/en-us/powershell/module/bitstransfer/add-bitsfile?view=windowsserver2019-ps
author: Austin Songer @austinsonger
date: 2021/08/19
modified: 2023/01/10
tags:
    - attack.exfiltration
    - attack.persistence
    - attack.t1197
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\powershell.exe'
            - '\powershell_ise.exe'
            - '\pwsh.exe'
        CommandLine|contains:
            - 'Get-BitsTransfer'
            - 'Add-BitsFile'
    condition: selection
falsepositives:
    - Unknown
level: medium

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

9bbacd1d-6f2f-45c6-8841-eefe5d68752d

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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