Techniques › T1491.002 › AN1622
AN1622 Analytic 1622
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Adversary modifies externally-facing web content by accessing and overwriting hosted HTML/JS/CSS files, typically following web shell deployment, credential abuse, or exploitation of web application vulnerabilities.</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 |
|---|---|---|
| WinEventLog:Security | EventCode=4663, 4670, 4656 | DC0061 File Modification |
| NSM:Connections | Unusual POST requests to admin or upload endpoints | DC0085 Network Traffic Content |
| WinEventLog:Sysmon | EventCode=1 | DC0032 Process 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 |
|---|---|
target_directory | Web root folder varies by environment, e.g., C:\inetpub\wwwroot |
UserContext | May vary based on which service account hosts the website |
TimeWindow | Time between webshell upload and file overwrite may vary |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2018-15961 | Adobe ColdFusion | Mapped |