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Emerging Threathighexperimental

Cisco ASA Exploitation Activity - Proxy

Detects suspicious requests to Cisco ASA WebVpn via proxy logs associated with CVE-2025-20333 and CVE-2025-20362 exploitation.

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Swachchhanda Shrawan Poudel (Nextron Systems)Created Thu Nov 2015697955-6a29-47ca-92e9-0e05efae32602025
Emerging Threat
Active Threat

Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.

Log Source
Proxy Log
CategoryProxy Log← raw: proxy
Detection Logic
Detection Logic1 selector
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem:
            - '/+CSCOU+/MacTunnelStart.jar'
            - '/+CSCOL+/csvrloader64.cab'
            - '/+CSCOL+/csvrloader.jar'
    condition: selection
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
x.com
MITRE ATT&CK

Other

cve.2025-20333cve.2025-20362detection.emerging-threats
Rule Metadata
Rule ID
15697955-6a29-47ca-92e9-0e05efae3260
Status
experimental
Level
high
Type
Emerging Threat
Created
Thu Nov 20
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Path
rules-emerging-threats/2025/Exploits/CVE-2025-20333/proxy_exploit_cve_2025_20333.yml
Raw Tags
attack.initial-accessattack.t1190cve.2025-20333cve.2025-20362detection.emerging-threats
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