Transferring Files with Credential Data via Network Shares - Zeek — Sigma Rule

Rule metadata and linked tags

Author: @neu5ron, Teymur Kheirkhabarov, oscd.community. Source status: test; severity: medium. Source dates: 2020-04-02 / 2021-11-27.

{
  "product": "zeek",
  "service": "smb_files"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2f2ceb768cfaeb752288dc986fbdf1f23a4a94dbc518687f016abf8c96643fad

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: Transferring Files with Credential Data via Network Shares - Zeek
id: 2e69f167-47b5-4ae7-a390-47764529eff5
related:
    - id: 910ab938-668b-401b-b08c-b596e80fdca5
      type: similar
status: test
description: Transferring files with well-known filenames (sensitive files with credential data) using network shares
references:
    - https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment
author: '@neu5ron, Teymur Kheirkhabarov, oscd.community'
date: 2020-04-02
modified: 2021-11-27
tags:
    - attack.credential-access
    - attack.t1003.002
    - attack.t1003.001
    - attack.t1003.003
logsource:
    product: zeek
    service: smb_files
detection:
    selection:
        name:
            - '\mimidrv'
            - '\lsass'
            - '\windows\minidump\'
            - '\hiberfil'
            - '\sqldmpr'
            - '\sam'
            - '\ntds.dit'
            - '\security'
    condition: selection
falsepositives:
    - Transferring sensitive files for legitimate administration work by legitimate administrator
level: medium

Original YAML and metadata in JSON

False positives

• Transferring sensitive files for legitimate administration work by legitimate administrator

Source references

• https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment