> 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/uncommon-attempt-to-clear-shell-history.md).

# Uncommon attempt to clear shell history

### Synopsis

| Field                | Value                     |
| -------------------- | ------------------------- |
| Activation Period    | 14 Days                   |
| Training Period      | 30 Days                   |
| Test Period          | N/A (single event)        |
| Deduplication Period | 1 Day                     |
| Required Data        | XDR Agent                 |
| ATT\&CK Tactic       | Stealth (TA0005)          |
| ATT\&CK Technique    | Indicator Removal (T1070) |
| Severity             | Low                       |

### Description

An attempt to clear or manipulate shell history files was detected.

### Attacker's Goals

Attackers may clear or modify shell history files to remove traces of their activities.

### Investigative actions

* Investigate the user and process that executed the command.
* Examine other related activities on the host to understand the context of this action.

### Variations

<details>

<summary>Globally uncommon attempt to clear shell history</summary>

**Synopsis**

| Field             | Value                     |
| ----------------- | ------------------------- |
| ATT\&CK Tactic    | Stealth (TA0005)          |
| ATT\&CK Technique | Indicator Removal (T1070) |
| Severity          | Medium                    |

**Description**

An attempt to clear or manipulate shell history files was detected.

**Attacker's Goals**

Attackers may clear or modify shell history files to remove traces of their activities.

**Investigative actions**

* Investigate the user and process that executed the command.
* Examine other related activities on the host to understand the context of this action.

</details>


---

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