Attachment: Office file contains OLE relationship to credential phishing page

 1name: "Attachment: Office file contains OLE relationship to credential phishing page"
 2description: |
 3    Office file OLE relationship link is a credential page, or contains credential phishing language.
 4type: "rule"
 5severity: "high"
 6source: |
 7  type.inbound
 8  and any(attachments,
 9          (
10            .file_extension in~ $file_extensions_macros
11            or (
12              .file_extension is null
13              and .file_type == "unknown"
14              and .content_type == "application/octet-stream"
15              and .size < 100000000
16            )
17          )
18          and any(file.oletools(.).relationships,
19                  (
20                    any(ml.nlu_classifier(ml.link_analysis(.target_url).final_dom.display_text
21                        ).intents,
22                        .name == "cred_theft"
23                        and .confidence in ("medium", "high")
24                    )
25                    and .target_url.domain.root_domain not in ("google.com", "goo.gl")
26                   
27                    and ml.link_analysis(.target_url).effective_url.domain.domain != "login.microsoftonline.com"
28                  )
29                  or ml.link_analysis(.target_url).credphish.disposition == "phishing"
30          )
31  )
32  and (
33    (
34      profile.by_sender().prevalence in ("new", "outlier")
35      and not profile.by_sender().solicited
36    )
37    or (
38      profile.by_sender().any_messages_malicious_or_spam
39      and not profile.by_sender().any_false_positives
40    )
41  )  
42attack_types:
43  - "Credential Phishing"
44tactics_and_techniques:
45  - "Evasion"
46  - "Social engineering"
47detection_methods:
48  - "File analysis"
49  - "HTML analysis"
50  - "Natural Language Understanding"
51  - "OLE analysis"
52  - "URL analysis"
53id: "d55793d0-865e-53c4-ae51-f1b0fec50ec6"