Techniques › T1491.002 › AN1623
AN1623 Analytic 1623
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Adversary compromises a Linux-based web server and modifies hosted web files by exploiting upload vulnerabilities, remote code execution, or replacing index.html via SSH/webshell.</p>
- Detects
- T1491.002 External Defacement
- Part of
- DET0590 Behavioral Detection of External Website Defacement across 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 | open/write syscalls targeting web directory files | DC0061 File Modification |
| NSM:Connections | Successful sudo or ssh from unknown IPs | DC0088 Logon Session Metadata |
| NSM:Flow | Suspicious POSTs to upload endpoints | DC0085 Network Traffic Content |
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 |
|---|---|
web_root | May differ (e.g., /var/www/html, /srv/http, etc.) |
payload_hash | Adversary content hash may change across campaigns |
UserContext | Can range from apache/nginx user to root if escalated |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2018-15961 | Adobe ColdFusion | Mapped |