Process Memory Dump Via Dotnet-Dump — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-03-14 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0b618261b817b2b6ddc7757bef97752fefe6d9933a369e8cf63727cbfc5c8a7b

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: Process Memory Dump Via Dotnet-Dump
id: 53d8d3e1-ca33-4012-adf3-e05a4d652e34
status: test
description: |
    Detects the execution of "dotnet-dump" with the "collect" flag. The execution could indicate potential process dumping of critical processes such as LSASS.
references:
    - https://learn.microsoft.com/en-us/dotnet/core/diagnostics/dotnet-dump#dotnet-dump-collect
    - https://twitter.com/bohops/status/1635288066909966338
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-03-14
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\dotnet-dump.exe'
        - OriginalFileName: 'dotnet-dump.dll'
    selection_cli:
        CommandLine|contains: 'collect'
    condition: all of selection_*
falsepositives:
    - Process dumping is the expected behavior of the tool. So false positives are expected in legitimate usage. The PID/Process Name of the process being dumped needs to be investigated
level: medium

Original YAML and metadata in JSON

False positives

• Process dumping is the expected behavior of the tool. So false positives are expected in legitimate usage. The PID/Process Name of the process being dumped needs to be investigated

Source references

• https://learn.microsoft.com/en-us/dotnet/core/diagnostics/dotnet-dump#dotnet-dump-collect
• https://twitter.com/bohops/status/1635288066909966338