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Suspicious VSFTPD Error Messages

Status
test
Severity
medium
Log source
product linux, service vsftpd
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects suspicious VSFTPD error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1190 Exploit Public-Facing Application

Rule body yaml

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

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

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'