An uncommon file was created in the startup folder

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-04
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

Deduplication Period

7 Days

Required Data

  • Requires:
    • XDR Agent
  • Requires:
    • eXtended Threat Hunting (XTH)

Detection Modules

ATT&CK Tactic

Persistence (TA0003)

ATT&CK Technique

Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001)

Severity

Informational

Description

An uncommon file was created in the startup folder.

Attacker's Goals

Persistence on the host.

Investigative actions

  • Check if the file was written during an installation of a legitimate application (what other files that were written by the process).
  • Check what program opens this file by the extension - Check the registry at HKEY_CLASSES_ROOT.[extension]\shell\[action]\command for the default application or command to execute.

Variations

An executable file with a non-default extension was added to the startup folder

Synopsis

ATT&CK Tactic

Persistence (TA0003)

ATT&CK Technique

Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001)

Severity

Medium

Description

An executable file with a non-default extension was added to the startup folder.

Attacker's Goals

Persistence on the host.

Investigative actions

  • Check if the file was written during an installation of a legitimate application (what other files that were written by the process).
  • Check what program opens this file by the extension - Check the registry at HKEY_CLASSES_ROOT.[extension]\shell\[action]\command for the default application or command to execute.


An executable or script was added to the startup folder

Synopsis

ATT&CK Tactic

Persistence (TA0003)

ATT&CK Technique

Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001)

Severity

Low

Description

An executable or script was added to the startup folder, which may happen on new program installation, but may also indicate a malicious program persisting itself.

Attacker's Goals

Persistence on the host.

Investigative actions

  • Check if the file was written during an installation of a legitimate application (what other files that were written by the process).
  • Check what program opens this file by the extension - Check the registry at HKEY_CLASSES_ROOT.[extension]\shell\[action]\command for the default application or command to execute.


A file with an uncommon extension was added to the startup folder

Synopsis

ATT&CK Tactic

Persistence (TA0003)

ATT&CK Technique

Severity

Low

Description

A file with an uncommon extension was added to the startup folder, which may happen on new program installation, but may also indicate a malicious program persisting itself.

Attacker's Goals

Persistence on the host.

Investigative actions

  • Check if the file was set during installation process (what other files were written by the process).
  • Check the registry at HKEY_CLASSES_ROOT.[extension]\shell\[action]\command for the default application or command to execute.


A new shortcut (lnk) was added to the startup folder

Synopsis

ATT&CK Tactic

Persistence (TA0003)

ATT&CK Technique

Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001)

Severity

Low

Description

A new shortcut (lnk) file was added to the startup folder, which may happen on new program installation, but may also indicate a malicious program persisting itself.

Attacker's Goals

Persistence on the host.

Investigative actions

  • Check if the file was written during an installation of a legitimate application (what other files that were written by the process).
  • Check what program opens this file by the extension - Check the registry at HKEY_CLASSES_ROOT.[extension]\shell\[action]\command for the default application or command to execute.