Sigma rule: Potential Exploitation of CrushFTP RCE Vulnerability (CVE-2025-54309)

Rule

Title

Potential Exploitation of CrushFTP RCE Vulnerability (CVE-2025-54309)

Status

experimental

Level

high

Author

Nisarg Suthar

Date

2025-08-01

File

rules-emerging-threats/2025/Exploits/CVE-2025-54309/proc_creation_win_exploit_cve_2025_54309.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious child processes created by CrushFTP. It could be an indication of exploitation of a RCE vulnerability such as CVE-2025-54309.

Log source

product

windows

category

process_creation

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_*

False positives (as the rule lists them)

• Legitimate administrative command execution

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

CVEs this rule names

• CVE-2025-54309

MITRE ATT&CK ids this rule names

• T1059.001
• T1059.003
• T1068
• T1190

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/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-54309/proc_creation_win_exploit_cve_2025_54309.yml