Techniques › T1573.001 › AN0400
AN0400 Analytic 0400
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Processes that typically do not perform cryptographic operations loading symmetric encryption libraries (e.g., bcryptprimitives.dll, aes.dll), then initiating outbound connections with high-entropy payloads. Defender correlates process creation, DLL load, and anomalous encrypted traffic patterns.</p>
- Detects
- T1573.001 Symmetric Cryptography
- Part of
- DET0143 Detection Strategy for Encrypted Channel via Symmetric Cryptography 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:Sysmon | EventCode=7 | DC0016 Module Load |
| 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 |
|---|---|
AllowedCryptoProcesses | Processes normally expected to use symmetric crypto (e.g., disk encryption, secure messaging). |
EntropyThreshold | Minimum payload entropy score for flagging unusual encrypted sessions. |
TimeWindow | Correlation window between module load and encrypted connection creation. |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2021-40449 | Microsoft Windows | Mapped |
| CVE-2021-40539 | Zoho ManageEngine | Mapped |
| CVE-2021-44077 | Zoho ManageEngine ServiceDesk Plus (SDP) / SupportCenter Plus | Mapped |