Attachment: PDF with link to zip containing a wsf file

 1name: "Attachment: PDF with link to zip containing a wsf file"
 2description: "Detects a PDF attachment with a link to a ZIP file that contains a WSF file"
 3references:
 4  - "https://analyzer.sublime.security/?id=596edcf4-507e-4714-8b2d-b1f51c258c70"
 5  - "https://twitter.com/Cryptolaemus1/status/1649091718552379392"
 6  - "https://twitter.com/Cryptolaemus1/status/1650826597333696515"
 7type: "rule"
 8severity: "high"
 9source: |
10  type.inbound
11  and any(attachments,
12          .file_type == "pdf"
13          and any(file.explode(.),
14                  any(.scan.url.urls,
15                      strings.icontains(.url, "zip")
16                      and any(ml.link_analysis(.).files_downloaded,
17                              any(file.explode(.), .file_extension == "wsf")
18                      )
19                  )
20                  or any(.scan.url.urls,
21                         strings.icontains(.url, "php")
22                         and any(ml.link_analysis(.).files_downloaded,
23                                 any(file.explode(.),
24                                     .file_extension == "zip"
25                                     and any(.scan.zip.attempted_files,
26                                             strings.icontains(., "wsf")
27                                     )
28                                 )
29                         )
30                  )
31          )
32  )  
33tags:
34  - "Malfam: QakBot"
35attack_types:
36  - "Malware/Ransomware"
37tactics_and_techniques:
38  - "Evasion"
39  - "PDF"
40detection_methods:
41  - "Archive analysis"
42  - "Content analysis"
43  - "File analysis"
44  - "URL analysis"
45id: "93bc7db4-248f-502a-bc9a-919915cbc0fb"