Monitoring For Persistence Via BITS — Sigma Rule

Rule metadata and linked tags

Author: Sreeman. Source status: test; severity: medium. Source dates: 2020-10-29 / 2024-01-25.

{
  "product": "windows",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 51ddb3daea64948a147f3adb583019176db93af85ad04eb19f1397daf3425867

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Monitoring For Persistence Via BITS
id: b9cbbc17-d00d-4e3d-a827-b06d03d2380d
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:
    selection_img:
        - Image|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: selection_img and (all of selection_cli_notify_* or all of selection_cli_add_*)
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source 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