Techniques › T1573.001 › AN0401
AN0401 Analytic 0401
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Unexpected processes (e.g., bash, python, custom binaries) dynamically loading libcrypto or performing AES/RC4 encryption operations, then initiating outbound sessions with abnormal byte entropy or asymmetric 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 |
|---|---|---|
| auditd:SYSCALL | execve or socket/connect system calls from processes using crypto libraries | DC0032 Process Creation |
| linux:syslog | System daemons initiating encrypted sessions with unexpected destinations | DC0038 Application Log Content |
| linux:osquery | Process linked with libcrypto.so making external connections | DC0016 Module Load |
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 |
|---|---|
TrustedCryptoLibs | Baseline expected crypto libraries to suppress false positives. |
TrafficAsymmetryRatio | Ratio of sent/received bytes indicating possible hidden C2. |
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 |