> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/rare-appid-usage-to-a-rare-destination.md).

# Rare AppID usage to a rare destination

### Synopsis

| Field                | Value                                                                                                                                |
| -------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| Activation Period    | 14 Days                                                                                                                              |
| Training Period      | 30 Days                                                                                                                              |
| Test Period          | N/A (single event)                                                                                                                   |
| Deduplication Period | 14 Days                                                                                                                              |
| Required Data        | <p>Requires one of the following data sources:<br>Palo Alto Networks Firewall traffic Logs OR XDR Agent OR Third-Party Firewalls</p> |
| ATT\&CK Tactic       | Command and Control (TA0011)                                                                                                         |
| ATT\&CK Technique    | Application Layer Protocol (T1071), Non-Standard Port (T1571)                                                                        |
| Severity             | Informational                                                                                                                        |

### Description

Rare AppID with port usage to rare destination.

### Attacker's Goals

Attackers might use well-known ports with uncommon applications to avoid being detected by a non-application aware firewall or to bypass firewall rules based only on ports.

### Investigative actions

Investigate the endpoints participating in the session.

### Variations

<details>

<summary>Rare AppID usage to a rare destination using an unsigned process</summary>

**Synopsis**

| Field             | Value                                                         |
| ----------------- | ------------------------------------------------------------- |
| ATT\&CK Tactic    | Command and Control (TA0011)                                  |
| ATT\&CK Technique | Application Layer Protocol (T1071), Non-Standard Port (T1571) |
| Severity          | Low                                                           |

**Description**

Rare AppID with port usage to rare destination.

**Attacker's Goals**

Attackers might use well-known ports with uncommon applications to avoid being detected by a non-application aware firewall or to bypass firewall rules based only on ports.

**Investigative actions**

Investigate the endpoints participating in the session.

</details>

<details>

<summary>Rare AppID usage to a rare destination from an internet-facing server</summary>

**Synopsis**

| Field             | Value                                                         |
| ----------------- | ------------------------------------------------------------- |
| ATT\&CK Tactic    | Command and Control (TA0011)                                  |
| ATT\&CK Technique | Application Layer Protocol (T1071), Non-Standard Port (T1571) |
| Severity          | Low                                                           |

**Description**

Rare AppID with port usage to rare destination.

**Attacker's Goals**

Attackers might use well-known ports with uncommon applications to avoid being detected by a non-application aware firewall or to bypass firewall rules based only on ports.

**Investigative actions**

Investigate the endpoints participating in the session.

</details>


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