Detection rules › Sublime MQL
Attachment: Fake PDF Invoices Yara
These yara signatures match fake invoice PDFs with specific artifiacts including images and link locations.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Malware/Ransomware, Credential Phishing |
| Tactics and techniques | PDF, Social engineering |
Event coverage
| Message attribute |
|---|
| attachments (collection) |
| type |
Rule body MQL
type.inbound
and any(filter(attachments, .file_type == "pdf"),
any(file.explode(.),
any(.scan.yara.matches,
.name in (
"fake_invoice_pdf_structure_01",
"fake_invoice_pdf_images_01",
)
)
)
)
Detection logic
Scope: inbound message.
These yara signatures match fake invoice PDFs with specific artifiacts including images and link locations.
- inbound message
any of
filter(attachments)where:any of
file.explode(.)where:any of
.scan.yara.matcheswhere:- .name in ('fake_invoice_pdf_structure_01', 'fake_invoice_pdf_images_01')
Inspects: attachments[].file_type, type.inbound. Sensors: file.explode.
Indicators matched (3)
| Field | Match | Value |
|---|---|---|
attachments[].file_type | equals | pdf |
file.explode(filter(attachments)[])[].scan.yara.matches[].name | member | fake_invoice_pdf_structure_01 |
file.explode(filter(attachments)[])[].scan.yara.matches[].name | member | fake_invoice_pdf_images_01 |