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Nasreddine Bencherchali
11c909f725
* Add YAML formatting and validation infrastructure - Add yamlfmt configuration (.yamlfmt) with 4-space indent, LF line endings - Add yamllint configuration (.yamllint) for syntax validation (detections/ only) - Add pre-commit hook for automatic YAML formatting - Add CI validation script with unified error output - Add GitHub Actions workflow for PR validation - Add documentation for setup and usage - Support custom yamlfmt binary path via --yamlfmt-path flag * comment yaml check from pre-commit * apply yamlfmt * Update yaml-validation.yml * Update yaml-validation.yml * application folder search formatting * cloud folder search formatting * web folder search formatting * network folder search formatting * endpoint folder search formatting * resolve first conflict * apply formatting * remove additional pipe * Update README.md * update versions * restore and update formatting (#3920) --------- Co-authored-by: Bhavin Patel <bhavin.j.patel91@gmail.com>
65 lines
3.6 KiB
YAML
65 lines
3.6 KiB
YAML
name: WS FTP Remote Code Execution
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id: b84e8f39-4e7b-4d4f-9e7c-fcd29a227845
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version: 7
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date: '2026-02-25'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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data_source:
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- Suricata
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description: The following analytic detects potential Remote Code Execution (RCE) attempts exploiting CVE-2023-40044 in WS_FTP software. It identifies HTTP POST requests to the "/AHT/AhtApiService.asmx/AuthUser" URL with a status code of 200. This detection leverages the Web datamodel to monitor specific URL patterns and HTTP status codes. This activity is significant as it may indicate an exploitation attempt, potentially allowing an attacker to execute arbitrary code on the server. If confirmed malicious, this could lead to unauthorized access, data exfiltration, or further compromise of the affected system.
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search: |-
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| tstats count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Web
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WHERE Web.url IN ("/AHT/AhtApiService.asmx/AuthUser") Web.status=200 Web.http_method=POST
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BY Web.http_user_agent, Web.status Web.http_method,
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Web.url, Web.url_length, Web.src,
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Web.dest, sourcetype
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| `drop_dm_object_name("Web")`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `ws_ftp_remote_code_execution_filter`
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how_to_implement: The following analytic requires the Web datamodel. Ensure data source is mapped correctly or modify and tune for your data source.
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known_false_positives: If WS_FTP Server is not in use, this analytic will not return results. Monitor and tune for your environment. Note the MetaSploit module is focused on only hitting /AHT/ and not the full /AHT/AhtApiService.asmx/AuthUser URL.
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references:
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- https://github.com/projectdiscovery/nuclei-templates/pull/8296/files
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- https://www.assetnote.io/resources/research/rce-in-progress-ws-ftp-ad-hoc-via-iis-http-modules-cve-2023-40044
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- https://github.com/rapid7/metasploit-framework/pull/18414
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Potential WS FTP Remote Code Execution detected against URL $url$ on $dest$ from $src$
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risk_objects:
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- field: dest
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type: system
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score: 72
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threat_objects:
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- field: src
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type: ip_address
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tags:
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cve:
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- CVE-2023-40044
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analytic_story:
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- WS FTP Server Critical Vulnerabilities
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asset_type: Web Server
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atomic_guid: []
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mitre_attack_id:
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- T1190
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/ws_ftp/wsftpweb.log
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source: suricata
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sourcetype: suricata
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