• Sublime Core Feed
Medium Severity

URLhaus: Malicious domain in message body or pdf attachment (trusted reporters)

Description

Detects URLhaus domains submitted by trusted reporters in message bodies or pdf attachments

References

No references.

Sublime Security
Created Aug 17th, 2023 • Last updated Nov 18th, 2023
Source
type.inbound
and (
  any(body.links,
      // filter potentially known good domains
      // prevents FPs on entries such as drive[.]google[.]com, or
      // other accidental pushes to the List
    
      .href_url.domain.domain not in $free_file_hosts
      and .href_url.domain.root_domain not in $free_file_hosts
      and .href_url.domain.domain not in $tranco_1m
      and .href_url.domain.domain not in $umbrella_1m

      // this ensures we don't flag on legit FQDNs that
      // aren't in the Tranco 1M, but their root domains are
      // eg: support[.]google[.]com
      and .href_url.domain.root_domain not in $tranco_1m
      and .href_url.domain.root_domain not in $umbrella_1m
      and .href_url.domain.root_domain not in $free_subdomain_hosts
      and .href_url.domain.root_domain in $abuse_ch_urlhaus_domains_trusted_reporters
  )
  or any(attachments,
        .file_type == "pdf"
        and any(file.explode(.),
                any(.scan.pdf.urls,
                    // filter potentially known good domains
                    // prevents FPs on entries such as drive[.]google[.]com, or
                    // other accidental pushes to the List
                    .domain.domain not in $free_file_hosts
                    and .domain.root_domain not in $free_file_hosts
                    and .domain.domain not in $free_subdomain_hosts
                    and .domain.domain not in $tranco_1m
                    and .domain.domain not in $umbrella_1m

                    // this ensures we don't flag on legit FQDNs that
                    // aren't in the Tranco 1M, but their root domains are
                    // eg: support[.]google[.]com
                    and .domain.root_domain not in $tranco_1m
                    and .domain.root_domain not in $umbrella_1m
                    and .domain.domain in $abuse_ch_urlhaus_domains_trusted_reporters
                )
        )
  )
)
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