Suspicious Successful IIS Shortname Fuzzing Scan (via webserver)

title: Suspicious Successful IIS Shortname Fuzzing Scan (via webserver)
id: df19a167-3888-55e1-bebb-587a699b08b2
status: stable
description: This rule detects when IIS uses an old .Net Framework it's possible to enumerate folders with the symbol "~"
references:
    - https://attack.mitre.org/techniques/T1190/
    - https://github.com/projectdiscovery/nuclei-templates/blob/9d2889356eebba661c8407038e430759dfd4ec31/fuzzing/iis-shortname.yaml
    - https://www.exploit-db.com/exploits/19525
    - https://github.com/lijiejie/IIS_shortname_Scanner
author: Huntrule Team
date: 2026-01-10
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    category: webserver
detection:
    selection:
        cs-uri-query|contains: '~1'
        cs-uri-query|endswith: 'a.aspx'
        cs-method:
            - GET
            - OPTIONS
        sc-status:
            - 200
            - 301
    condition: selection
falsepositives:
    - Unknown
level: medium