Attachment with high risk VBA macro (unsolicited)

calendar Dec 19, 2023  ยท
Share on: linkedin copy

Potentially malicious attachment containing a VBA macro. Oletools categorizes the macro risk as 'high'.

Sublime rule (View on GitHub)

 1name: "Attachment with high risk VBA macro (unsolicited)"
 2description: |
 3    Potentially malicious attachment containing a VBA macro. Oletools categorizes the macro risk as 'high'.
 4references:
 5  - "https://threatpost.com/microsoft-outlook-users-targeted-by-gamaredons-new-vba-macro/156484/"
 6type: "rule"
 7severity: "high"
 8source: |
 9  type.inbound
10  and any(attachments,
11          (
12            .file_extension in~ $file_extensions_macros
13            or (
14                  .file_extension is null
15                  and .file_type == "unknown"
16                  and .content_type == "application/octet-stream"
17                  and .size < 100000000
18            )
19          )
20          and file.oletools(.).indicators.vba_macros.risk == "high"
21  )
22  and (
23    not profile.by_sender().solicited
24    or (
25      profile.by_sender().any_messages_malicious_or_spam
26      and not profile.by_sender().any_false_positives
27    )
28  )  
29attack_types:
30  - "Malware/Ransomware"
31tactics_and_techniques:
32  - "Macros"
33detection_methods:
34  - "File analysis"
35  - "Macro analysis"
36  - "OLE analysis"
37  - "Sender analysis"
38id: "a2b20e16-b363-50f1-92a5-ee6c41012118"
to-top