Suspicious VSFTPD Error Messages — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: medium. Source dates: 2017-07-05 / 2021-11-27.

{
  "product": "linux",
  "service": "vsftpd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 955277148926b4fd458ba9152a2ff52c6b076af9b57b172c191e744a7ca69d96

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: Suspicious VSFTPD Error Messages
id: 377f33a1-4b36-4ee1-acee-1dbe4b43cfbe
status: test
description: Detects suspicious VSFTPD error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts
references:
    - https://github.com/dagwieers/vsftpd/
author: Florian Roth (Nextron Systems)
date: 2017-07-05
modified: 2021-11-27
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    product: linux
    service: vsftpd
detection:
    keywords:
        - 'Connection refused: too many sessions for this address.'
        - 'Connection refused: tcp_wrappers denial.'
        - 'Bad HTTP verb.'
        - 'port and pasv both active'
        - 'pasv and port both active'
        - 'Transfer done (but failed to open directory).'
        - 'Could not set file modification time.'
        - 'bug: pid active in ptrace_sandbox_free'
        - 'PTRACE_SETOPTIONS failure'
        - 'weird status:'
        - 'couldn''t handle sandbox event'
        - 'syscall * out of bounds'
        - 'syscall not permitted:'
        - 'syscall validate failed:'
        - 'Input line too long.'
        - 'poor buffer accounting in str_netfd_alloc'
        - 'vsf_sysutil_read_loop'
    condition: keywords
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/dagwieers/vsftpd/