Sublime Security medium experimental mql

Link to auto-downloaded disk image in encrypted zip

A link in the body of the email downloads an encrypted zip that contains a disk image of the format IMG, ISO or VHD. This is a combination of file types used to deliver Qakbot.

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Detection Logic

type.inbound
and any(body.links,
        any(ml.link_analysis(.).files_downloaded,
            any(file.explode(.),
                (
                  any(.flavors.yara, . == "encrypted_zip")
                  and any(.scan.zip.all_paths,
                          any([".img", ".iso", ".vhd"],
                              strings.ends_with(.., .)
                          )
                  )
                )
            )
        )
)
and (
  profile.by_sender().prevalence in ("new", "outlier")
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
)

Field Validations

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