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

title: Nginx Core Dump
id: 59ec40bb-322e-40ab-808d-84fa690d7e56
status: test
description: Detects a core dump of a crashing Nginx worker process, which could be a signal of a serious problem or exploitation attempts.
references:
    - https://docs.nginx.com/nginx/admin-guide/monitoring/debugging/#enabling-core-dumps
    - https://www.x41-dsec.de/lab/advisories/x41-2021-002-nginx-resolver-copy/
author: Florian Roth (Nextron Systems)
date: 2021-05-31
modified: 2023-05-08
tags:
    - attack.impact
    - attack.t1499.004
logsource:
    service: nginx
detection:
    keywords:
        - 'exited on signal 6 (core dumped)'
    condition: keywords
falsepositives:
    - Serious issues with a configuration or plugin
level: high