{
  "id": "CASE-2026-1004",
  "memory_type": "case",
  "scenario": "o365_suspicious_login",
  "title": "Multiple failed logins from residential proxy but no successful access",
  "abstract": "Repeated failed Microsoft 365 sign-in attempts targeted one user from a residential proxy network, with no successful authentication observed.",
  "verdict": "uncertain",
  "severity": "medium",
  "entities": {
    "users": [
      "frank@corp.example"
    ],
    "hosts": [],
    "mailboxes": [
      "frank@corp.example"
    ]
  },
  "observables": {
    "ips": [
      "203.0.113.201"
    ],
    "domains": [],
    "urls": [],
    "hashes": []
  },
  "evidence": [
    "High-volume failed attempts over a short period.",
    "Source IP attributed to a residential proxy provider.",
    "No matching successful sign-in or MFA event found."
  ],
  "patterns": [
    "verdict:uncertain",
    "scenario:o365_suspicious_login",
    "alert_type:azuread_password_spray_attempt"
  ],
  "related_refs": {
    "playbooks": [
      "PB-O365-LOGIN-001"
    ],
    "kb": [
      "KB-O365-IMPOSSIBLE-TRAVEL"
    ],
    "cases": []
  },
  "source_path": "/home/tom/soc_memory_poc/evaluation/datasets/mock_cases/o365_suspicious_login/CASE-2026-1004.json",
  "tags": [
    "o365",
    "login",
    "password-spray",
    "pending"
  ]
}