Potential Successful Linux FTP Brute Force Attack Detected
editPotential Successful Linux FTP Brute Force Attack Detected
editAn FTP (file transfer protocol) brute force attack is a method where an attacker systematically tries different combinations of usernames and passwords to gain unauthorized access to an FTP server, and if successful, the impact can include unauthorized data access, manipulation, or theft, compromising the security and integrity of the server and potentially exposing sensitive information. This rule identifies multiple consecutive authentication failures targeting a specific user account from the same source address and within a short time interval, followed by a successful authentication.
Rule type: eql
Rule indices:
- auditbeat-*
- logs-auditd_manager.auditd-*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Credential Access
Version: 4
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by host.id, auditd.data.addr, related.user with maxspan=5s [authentication where host.os.type == "linux" and event.dataset == "auditd_manager.auditd" and event.action == "authenticated" and auditd.data.terminal == "ftp" and event.outcome == "failure" and auditd.data.addr != null and auditd.data.addr != "0.0.0.0" and auditd.data.addr != "::"] with runs=10 [authentication where host.os.type == "linux" and event.dataset == "auditd_manager.auditd" and event.action == "authenticated" and auditd.data.terminal == "ftp" and event.outcome == "success" and auditd.data.addr != null and auditd.data.addr != "0.0.0.0" and auditd.data.addr != "::"] | tail 1
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Brute Force
- ID: T1110
- Reference URL: https://attack.mitre.org/techniques/T1110/
-
Sub-technique:
- Name: Password Guessing
- ID: T1110.001
- Reference URL: https://attack.mitre.org/techniques/T1110/001/
-
Sub-technique:
- Name: Password Spraying
- ID: T1110.003
- Reference URL: https://attack.mitre.org/techniques/T1110/003/