Attachment: HTML smuggling with concatenation obfuscation

calendar Aug 21, 2023  ยท
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Recursively scans files and archives to detect HTML smuggling techniques.

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 1name: "Attachment: HTML smuggling with concatenation obfuscation"
 2description: |
 3    Recursively scans files and archives to detect HTML smuggling techniques.
 4references:
 5type: "rule"
 6severity: "high"
 7authors:
 8  - twitter: "vector_sec"
 9source: |
10  type.inbound
11  and any(attachments,
12          (
13            .file_extension in~ ("html", "htm", "shtml", "dhtml")
14            or .file_extension in~ $file_extensions_common_archives
15            or .file_type == "html"
16          )
17          and any(file.explode(.),
18                  any(.scan.strings.strings,
19                      strings.ilike(., "*CJzYyIuY29uY2F0KCJyaXB0Iik*", '*"sc".concat("ript")*')
20                  )
21          )
22  )  
23attack_types:
24  - "Credential Phishing"
25  - "Malware/Ransomware"
26tactics_and_techniques:
27  - "Evasion"
28  - "HTML smuggling"
29  - "Scripting"
30detection_methods:
31  - "Archive analysis"
32  - "Content analysis"
33  - "File analysis"
34  - "HTML analysis"
35id: "108ab346-bc11-5f96-916c-678891332ae8"
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