Techniques › T1566.003 › AN0320
AN0320 Analytic 0320
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Inbound spearphishing attempts delivered via third-party services (e.g., Gmail, LinkedIn messages) leading to malicious file downloads or browser-initiated script execution. Defender view includes correlation of external service logins, unexpected file write operations, and suspicious descendant processes spawned from productivity or browser applications.</p>
- Detects
- T1566.003 Spearphishing via Service
- Part of
- DET0115 Detection Strategy for Spearphishing via a Service across OS Platforms
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| WinEventLog:Security | EventCode=4688 | DC0032 Process Creation |
| WinEventLog:Sysmon | EventCode=11 | DC0039 File Creation |
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
MonitoredServices | List of third-party services (e.g., Gmail, LinkedIn, Dropbox) relevant to the organization’s threat profile. |
SuspiciousProcessPatterns | Process lineage and parent-child execution relationships considered abnormal (e.g., outlook.exe → powershell.exe). |
TimeWindow | Correlates file creation and outbound connection activity within a tunable time period after message receipt. |