Techniques › T1566.003 › AN0321
AN0321 Analytic 0321
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Use of non-enterprise email or messaging services in Thunderbird, Evolution, or browsers leading to suspicious file downloads and subsequent execution. Defender view includes browser-initiated downloads of unexpected content and shell or interpreter processes launched post-download.</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 |
|---|---|---|
| auditd:SYSCALL | execve: Execution of bash, python, or perl processes spawned by browser/email client | DC0032 Process Creation |
| linux:syslog | Inbound messages from webmail services containing attachments or URLs | DC0038 Application Log Content |
| NSM:Flow | Outbound traffic to domains/IPs not previously resolved, occurring shortly after attachment download or link click | DC0078 Network Traffic Flow |
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 |
|---|---|
BrowserProcesses | Configured list of browsers or email clients to monitor (e.g., firefox, chromium, thunderbird). |
PhishingIndicators | Custom regex rules for suspicious URL patterns, file extensions, or encoded links. |