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Description

Detects suspicious Trello board links containing malicious indicators such as credential theft content, blocked users, malicious attachments, or boards with minimal content from unsolicited senders.

References

No references.

Sublime Security
Created Aug 20th, 2025 • Last updated Aug 20th, 2025
Source
type.inbound
and any(filter(body.links,
               .href_url.domain.root_domain == "trello.com"
               and strings.istarts_with(.href_url.path, "/b/")
        ),
        // avoid doing LinkAnalysis if the display-text has strong indications of phishing
        (
          // replace confusables - observed ITW
          regex.icontains(strings.replace_confusables(.display_text),
                          'review|proposal|document|efax|restore|[o0]pen|secure|messaging|reset|account|verify|login|notification|alert|urgent|immediate|access|support|\bupdate\b|download|attachment|service|payment|remittance|invoice|rfp|rfi|pdf|doc'
          )
          and not regex.icontains(strings.replace_confusables(.display_text),
                                  'customer service'
          )
          // add confidence to these strings by using profile.by_sender()
          and (
            not profile.by_sender_email().solicited
            and profile.by_sender_email().prevalence in ('new', 'outlier')
          )
        )
        or any(ml.link_analysis(.).additional_responses,
               // less than 4 cards on the Trello board
               length(.json['cards']) < 4
               or any(.json['cards'],
                      // suspicious link in a card title
                      (
                        strings.parse_url(.['name']).domain.valid
                        and (
                          ml.link_analysis(strings.parse_url(.['name'])).credphish.disposition == "phishing"
                          or ml.link_analysis(strings.parse_url(.['name'])).credphish.contains_captcha
                          // CF Turnstile
                          or any(ml.link_analysis(strings.parse_url(.['name'])).unique_urls_accessed,
                                 .domain.domain == "challenges.cloudflare.com"
                          )
                        )
                      )
                      // Trello detected a malicious card attachment
                      or .['badges']['maliciousAttachments'] > 0
               )
               // Trello has blocked the user account
               or any(.json['members'], .['activityBlocked'] == true)
               // the user is the sole member of their Trello account and is the admin
               or (
                 length(.json['memberships']) == 1
                 and all(.json['memberships'], .['orgMemberType'] == "admin")
               )
        )
)
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