Jonhnathan
34 lines
1.1 KiB
YAML
34 lines
1.1 KiB
YAML
title: Suspicious OpenSSH Daemon Error
|
|
id: e76b413a-83d0-4b94-8e4c-85db4a5b8bdc
|
|
status: experimental
|
|
description: Detects suspicious SSH / SSHD error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts
|
|
author: Florian Roth
|
|
date: 2017/06/30
|
|
modified: 2020/05/15
|
|
references:
|
|
- https://github.com/openssh/openssh-portable/blob/master/ssherr.c
|
|
- https://github.com/ossec/ossec-hids/blob/master/etc/rules/sshd_rules.xml
|
|
logsource:
|
|
product: linux
|
|
service: sshd
|
|
detection:
|
|
keywords|contains:
|
|
- 'unexpected internal error'
|
|
- 'unknown or unsupported key type'
|
|
- 'invalid certificate signing key'
|
|
- 'invalid elliptic curve value'
|
|
- 'incorrect signature'
|
|
- 'error in libcrypto'
|
|
- 'unexpected bytes remain after decoding'
|
|
- 'fatal: buffer_get_string: bad string'
|
|
- 'Local: crc32 compensation attack'
|
|
- 'bad client public DH value'
|
|
- 'Corrupted MAC on input'
|
|
condition: keywords
|
|
falsepositives:
|
|
- Unknown
|
|
level: medium
|
|
tags:
|
|
- attack.initial_access
|
|
- attack.t1190
|