InformationalALERT-4216engine: heuristic

Single User Multiple Failed Logins (Typo)

analyst review

Raw alert — normalized QRadar offense

asset: file-srv-02
protocol: TCP :80
src_ip: 10.45.8.208
dest_ip: 10.20.4.30
magnitude: 1/10
severity: 1/10
credibility: 6/10
relevance: 2/10
src network: internal_corp
events / flows: 30 / 29

triggered rules

▹ Auth: Repeated Failures Single Account
▹ Policy: Acceptable Use Violation

full offense JSON

{
  "offense_id": 4216,
  "description": "Single User Multiple Failed Logins (Typo) :: Benign/Low targeting file-srv-02",
  "offense_type": "Source IP",
  "offense_source": "10.45.8.208",
  "magnitude": 1,
  "severity": 1,
  "credibility": 6,
  "relevance": 2,
  "status": "OPEN",
  "source_network": "internal_corp",
  "destination_networks": [
    "internal_corp"
  ],
  "event_count": 30,
  "flow_count": 29,
  "start_time": "2025-11-03T06:01:00+00:00",
  "last_updated_time": "2025-11-03T06:08:00+00:00",
  "categories": [
    "Recon",
    "Information Gathering"
  ],
  "rules": [
    "Auth: Repeated Failures Single Account",
    "Policy: Acceptable Use Violation"
  ],
  "assigned_to": null,
  "dest_port": 80
}

AI triage

Likely port scan: Single User Multiple Failed Logins (Typo) from internal host 10.45.8.208 against file-srv-02 (10.20.4.30) over TCP, 30 events observed.

MITRE ATT&CK

T1590Gather Victim Network InformationReconnaissanceconfidence 63%

Alert indicators (Single User Multiple Failed Logins (Typo); rules: Auth: Repeated Failures Single Account) overlap most strongly with T1590 Gather Victim Network Information among the ATT&CK shortlist.

Priority — Informational

Scored Informational based on: QRadar magnitude 1/10.

Recommended next steps

1.Confirm the scan scope: how many destination ports/hosts were touched by the source IP.
2.Check whether any scanned port returned a SYN-ACK (successful connection) vs. all resets.
3.Block or rate-limit the source IP at the perimeter if it is external and unrecognized.
4.Search for follow-on activity from the same source (exploit attempts, logins).

Suggested hunting query (KQL)

CommonSecurityLog
| where TimeGenerated > ago(24h)
| where SourceIP == "10.45.8.208" and DestinationIP == "10.20.4.30"
| summarize Events=count() by DestinationPort, Protocol
| order by Events desc

ATT&CK candidate shortlist — matched before the model was called, so it justifies from real technique IDs

T1590Gather Victim Network Information·7.5T1110Brute Force·7T1595Active Scanning·6.5T1046Network Service Discovery·6T1078Valid Accounts·5.5T1548.002Bypass User Account Control·5T1018Remote System Discovery·4.5