Techniques › T1556.003 › AN1250
AN1250 Analytic 1250
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects unauthorized modifications to PAM configuration files or shared object modules. Correlates file modification events under /etc/pam.d/ or /lib/security/ with unusual authentication activity such as multiple simultaneous logins, off-hours logins, or logons without corresponding physical/VPN access.</p>
- Detects
- T1556.003 Pluggable Authentication Modules
- Part of
- DET0454 Detect Malicious Modification of Pluggable Authentication Modules (PAM)
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 | DC0061 File Modification |
| auditd:SYSCALL | execve | DC0032 Process Creation |
| NSM:Connections | simultaneous or anomalous logon sessions across multiple systems | DC0067 Logon Session 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 |
|---|---|
MonitoredPaths | List of PAM configuration and module directories monitored (e.g., /etc/pam.d/, /lib/security/). |
TimeWindow | Timeframe for correlating suspicious file modifications with anomalous login events. |
BaselineAccounts | Expected login frequency and systems per user account; deviations may indicate compromise. |