Techniques › T1556.005 › AN1621
AN1621 Analytic 1621
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects enabling of reversible password encryption in Active Directory or Group Policy, suspicious PowerShell commands modifying AD user properties, and unusual account configuration changes correlated with policy modifications. Multi-event correlation links Group Policy edits, PowerShell command execution, and user account property changes to identify tampering with authentication encryption settings.</p>
- Detects
- T1556.005 Reversible Encryption
- Part of
- DET0589 Detect Modification of Authentication Process via Reversible Encryption
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=4739 | DC0066 Active Directory Object Modification |
| WinEventLog:Sysmon | EventCode=1 | DC0032 Process Creation |
| WinEventLog:PowerShell | EventCode=4103, 4104, 4105, 4106 | DC0064 Command Execution |
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 |
|---|---|
MonitoredOUs | Scope of Organizational Units where reversible encryption property monitoring is enabled. |
TimeWindow | Time window in which to correlate Group Policy modification and subsequent user property changes. |
SuspiciousCmdletList | List of PowerShell cmdlets to monitor for account configuration changes. |