Detection rules › Sublime MQL

Attachment: Uncommon compressed file

Severity
low
Type
rule
Source
github.com/sublime-security/sublime-rules

Use if passing compressed or archive files is not typical behavior in your organization. This behavior has been observed in a number of phishing campaigns.

Threat classification

Sublime's own taxonomy (not MITRE ATT&CK).

CategoryValues
Attack typesMalware/Ransomware, Credential Phishing

Event coverage

Rule body MQL

type.inbound
and any(attachments,
        .file_extension in ('tar', 'iso', 'img', 'cab', 'gadget', 'uue')
)

Detection logic

Scope: inbound message.

Use if passing compressed or archive files is not typical behavior in your organization. This behavior has been observed in a number of phishing campaigns.

  1. inbound message
  2. any of attachments where:
    • .file_extension in ('tar', 'iso', 'img', 'cab', 'gadget', 'uue')

Inspects: attachments[].file_extension, type.inbound.

Indicators matched (6)

FieldMatchValue
attachments[].file_extensionmembertar
attachments[].file_extensionmemberiso
attachments[].file_extensionmemberimg
attachments[].file_extensionmembercab
attachments[].file_extensionmembergadget
attachments[].file_extensionmemberuue