Techniques › T1557 › AN0823
AN0823 Analytic 0823
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects suspicious DNS/ARP poisoning attempts, unauthorized modifications to registry/network configuration, or abnormal TLS downgrade activity. Correlates changes in system configuration with subsequent unusual network flows or authentication events.</p>
- Detects
- T1557 Adversary-in-the-Middle
- Part of
- DET0296 Detect Adversary-in-the-Middle via Network and Configuration Anomalies
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 | DC0063 Windows Registry Key Modification |
| 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 |
|---|---|
MonitoredRegistryPaths | Specific network stack and DNS registry keys that vary by enterprise configuration. |
DowngradeCipherList | List of weak/legacy ciphers tuned per environment for TLS downgrade detection. |
TimeWindow | Correlation period between config changes and abnormal network connections. |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2019-5591 | Fortinet FortiOS | Mapped |
| CVE-2022-1040 | Sophos Firewall | Mapped |
| CVE-2025-31200 | Apple Multiple Products | Stale |
| CVE-2025-31201 | Apple Multiple Products | Stale |