Data Export From MSSQL Table Via BCP.EXE — Sigma Rule

Rule metadata and linked tags

Author: Omar Khaled (@beacon_exe), MahirAli Khan (in/mahiralikhan), Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2024-08-20 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f6fc174b80823deee95473161a12858551ddaeff279f4374290106a9680376c1

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: Data Export From MSSQL Table Via BCP.EXE
id: c615d676-f655-46b9-b913-78729021e5d7
status: test
description: |
    Detects the execution of the BCP utility in order to export data from the database.
    Attackers were seen saving their malware to a database column or table and then later extracting it via "bcp.exe" into a file.
references:
    - https://docs.microsoft.com/en-us/sql/tools/bcp-utility
    - https://asec.ahnlab.com/en/61000/
    - https://asec.ahnlab.com/en/78944/
    - https://www.huntress.com/blog/attacking-mssql-servers
    - https://www.huntress.com/blog/attacking-mssql-servers-pt-ii
    - https://news.sophos.com/en-us/2024/08/07/sophos-mdr-hunt-tracks-mimic-ransomware-campaign-against-organizations-in-india/
    - https://research.nccgroup.com/2018/03/10/apt15-is-alive-and-strong-an-analysis-of-royalcli-and-royaldns/
author: Omar Khaled (@beacon_exe), MahirAli Khan (in/mahiralikhan), Nasreddine Bencherchali (Nextron Systems)
date: 2024-08-20
tags:
    - attack.execution
    - attack.exfiltration
    - attack.t1048
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\bcp.exe'
        - OriginalFileName: 'BCP.exe'
    selection_cli:
        CommandLine|contains:
            - ' out ' # Export data from a table
            - ' queryout ' # Export data based on a SQL query
    condition: all of selection_*
falsepositives:
    - Legitimate data export operations.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate data export operations.

Source references

• https://docs.microsoft.com/en-us/sql/tools/bcp-utility
• https://asec.ahnlab.com/en/61000/
• https://asec.ahnlab.com/en/78944/
• https://www.huntress.com/blog/attacking-mssql-servers
• https://www.huntress.com/blog/attacking-mssql-servers-pt-ii
• https://news.sophos.com/en-us/2024/08/07/sophos-mdr-hunt-tracks-mimic-ransomware-campaign-against-organizations-in-india/
• https://research.nccgroup.com/2018/03/10/apt15-is-alive-and-strong-an-analysis-of-royalcli-and-royaldns/