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Eric
77 lines
3.4 KiB
YAML
77 lines
3.4 KiB
YAML
name: WS FTP Remote Code Execution
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id: b84e8f39-4e7b-4d4f-9e7c-fcd29a227845
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version: 6
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date: '2025-05-02'
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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)
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attempts exploiting CVE-2023-40044 in WS_FTP software. It identifies HTTP POST requests
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to the "/AHT/AhtApiService.asmx/AuthUser" URL with a status code of 200. This detection
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leverages the Web datamodel to monitor specific URL patterns and HTTP status codes.
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This activity is significant as it may indicate an exploitation attempt, potentially
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allowing an attacker to execute arbitrary code on the server. If confirmed malicious,
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this could lead to unauthorized access, data exfiltration, or further compromise
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of the affected system.
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search: '| 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, Web.url, Web.url_length, Web.src,
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Web.dest, sourcetype | `drop_dm_object_name("Web")` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `ws_ftp_remote_code_execution_filter`'
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how_to_implement: The following analytic requires the Web datamodel. Ensure data source
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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
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results. Monitor and tune for your environment. Note the MetaSploit module is focused
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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 ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `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 $dest$
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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:
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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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