Detection rules › Sigma
Potential Exploitation of CrushFTP RCE Vulnerability (CVE-2025-54309)
Detects suspicious child processes created by CrushFTP. It could be an indication of exploitation of a RCE vulnerability such as CVE-2025-54309.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1190 Exploit Public-Facing Application |
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell, T1059.003 Command and Scripting Interpreter: Windows Command Shell |
| Privilege Escalation | T1068 Exploitation for Privilege Escalation |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Potential Exploitation of CrushFTP RCE Vulnerability (CVE-2025-54309)
id: 0fdc7c7f-c690-4217-9ae3-31f5156eed72
status: experimental
description: Detects suspicious child processes created by CrushFTP. It could be an indication of exploitation of a RCE vulnerability such as CVE-2025-54309.
references:
- https://reliaquest.com/blog/threat-spotlight-cve-2025-54309-crushftp-exploit/
- https://pwn.guide/free/web/crushftp
- https://firecompass.com/crushftp-vulnerability-cve-2025-54309-securing-file-transfer-services/
author: Nisarg Suthar
date: 2025-08-01
tags:
- attack.privilege-escalation
- attack.initial-access
- attack.execution
- attack.t1059.001
- attack.t1059.003
- attack.t1068
- attack.t1190
- cve.2025-54309
- detection.emerging-threats
logsource:
category: process_creation
product: windows
detection:
selection_parent:
ParentImage|endswith: '\crushftp.exe'
selection_child_powershell:
Image|endswith:
- '\powershell.exe'
- '\powershell_ise.exe'
- '\pwsh.exe'
CommandLine|contains|all:
- 'IEX'
- 'enc'
- 'Hidden'
- 'bypass'
selection_child_cmd:
Image|endswith: '\cmd.exe'
CommandLine|contains:
- '/c powershell'
- 'whoami'
- 'net.exe'
- 'net1.exe'
selection_child_others:
Image|endswith:
- '\bitsadmin.exe'
- '\certutil.exe'
- '\mshta.exe'
- '\cscript.exe'
- '\wscript.exe'
condition: selection_parent and 1 of selection_child_*
falsepositives:
- Legitimate administrative command execution
level: high
Stages and Predicates
Stage 0: condition
selection_parent and 1 of selection_child_*Stage 1: selection_parent
selection_parent:
ParentImage|endswith: '\crushftp.exe'
Stage 2: selection_child_powershell
selection_child_powershell:
Image|endswith:
- '\powershell.exe'
- '\powershell_ise.exe'
- '\pwsh.exe'
CommandLine|contains|all:
- 'IEX'
- 'enc'
- 'Hidden'
- 'bypass'
Stage 3: selection_child_cmd
selection_child_cmd:
Image|endswith: '\cmd.exe'
CommandLine|contains:
- '/c powershell'
- 'whoami'
- 'net.exe'
- 'net1.exe'
Stage 4: selection_child_others
selection_child_others:
Image|endswith:
- '\bitsadmin.exe'
- '\certutil.exe'
- '\mshta.exe'
- '\cscript.exe'
- '\wscript.exe'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
ParentImage | ends_with |
|