Monitoring For Persistence Via BITS

SIGMA detection rule by Sreeman · GPL-2.0

BITS will allow you to schedule a command to execute after a successful download to notify you that the job is finished. When the job runs on the system the command specified in the BITS job will be executed. This can be abused by actors to create a backdoor within the system and for persistence. It will be chained in a BITS job to schedule the download of malware/additional binaries and execute the program after being downloaded.

title: Monitoring For Persistence Via BITS
id: b6abae48-2937-b8aa-70ef-ae27212059c5
related:
    - id: b9cbbc17-d00d-4e3d-a827-b06d03d2380d
      type: derived
status: test
description: |
    BITS will allow you to schedule a command to execute after a successful download to notify you that the job is finished.
    When the job runs on the system the command specified in the BITS job will be executed.
    This can be abused by actors to create a backdoor within the system and for persistence.
    It will be chained in a BITS job to schedule the download of malware/additional binaries and execute the program after being downloaded.
references:
    - https://www.fireeye.com/blog/threat-research/2020/10/kegtap-and-singlemalt-with-a-ransomware-chaser.html
    - http://0xthem.blogspot.com/2014/03/t-emporal-persistence-with-and-schtasks.html
    - https://isc.sans.edu/diary/Wipe+the+drive+Stealthy+Malware+Persistence+Mechanism+-+Part+1/15394
author: Sreeman
date: 2020-10-29
modified: 2024-01-25
tags:
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1197
logsource:
    product: windows
    category: process_creation
detection:
    process_creation:
        EventID: 4688
        Channel: Security
    selection_img:
        - NewProcessName|endswith: \bitsadmin.exe
        - OriginalFileName: bitsadmin.exe
    selection_cli_notify_1:
        CommandLine|contains: /SetNotifyCmdLine
    selection_cli_notify_2:
        CommandLine|contains:
            - '%COMSPEC%'
            - cmd.exe
            - regsvr32.exe
    selection_cli_add_1:
        CommandLine|contains: /Addfile
    selection_cli_add_2:
        CommandLine|contains:
            - 'http:'
            - 'https:'
            - 'ftp:'
            - 'ftps:'
    condition: process_creation and (selection_img and (all of selection_cli_notify_* or all of selection_cli_add_*))
falsepositives:
    - Unknown
level: medium
ruletype: Sigma

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