Brand impersonation: Sharepoint fake file share

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

This rule detects messages impersonating a Sharepoint file sharing email where no links point to known Microsoft domains.

Threat classification

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

Category	Values
Attack types	Credential Phishing, Malware/Ransomware
Tactics and techniques	Impersonation: Brand, Social engineering

Event coverage

Message attribute
attachments (collection)
body
body.current_thread
body.html
body.links (collection)
body.plain
headers (collection)
headers.auth_summary
recipients
recipients.to (collection)
sender
sender.email
subject
type

Rule body MQL

type.inbound

// Sharepoint body content looks like this
and (
  (
    (
      any([body.current_thread.text, body.plain.raw],
          strings.ilike(.,
                        "*shared a file with you*",
                        "*shared with you*",
                        "*invited you to access a file*",
                        "*received a document*",
                        "*shared a document*",
                        "*shared a new document*",
                        "*shared this document*"
          )
      )
      or any(ml.nlu_classifier(body.current_thread.text).topics,
             .name == "File Sharing and Cloud Services"
             and .confidence == "high"
      )
      //
      // This rule makes use of a beta feature and is subject to change without notice
      // using the beta feature in custom rules is not suggested until it has been formally released
      //
      or strings.ilike(beta.ocr(file.message_screenshot()).text,
                       "*shared a file with you*",
                       "*shared with you*",
                       "*invited you to access a file*",
                       "*received a document*",
                       "*shared a document*",
                       "*shared a new document*",
                       "*shared this document*"
      )
      //
      // This rule makes use of a beta feature and is subject to change without notice
      // using the beta feature in custom rules is not suggested until it has been formally released
      //
      or any(ml.nlu_classifier(beta.ocr(file.message_screenshot()).text).topics,
             .name == "File Sharing and Cloud Services"
             and .confidence == "high"
      )
    )
    and (
      strings.ilike(subject.subject,
                    "*shared*",
                    "*updated*",
                    "*sign*",
                    "*review*",
                    "*scanned*"
      )
      or strings.ilike(subject.subject,
                       "*Excel*",
                       "*SharePoint*",
                       "*PowerPoint*",
                       "*OneNote*"
      )
      or strings.ilike(sender.display_name,
                       "*Excel*",
                       "*SharePoint*",
                       "*PowerPoint*",
                       "*OneNote*"
      )
      or any(body.links, strings.icontains(.display_text, "OPEN DOCUMENT"))
      or subject.subject is null
      or subject.subject == ""
      // the org as determined by NLU is in the subject
      or any(ml.nlu_classifier(body.current_thread.text).entities,
             .name == "org" and strings.icontains(subject.subject, .text)
      )
    )
  )
  or any([
           "Contigo", // Spanish
           "Avec vous", // French
           "Mit Ihnen", // German
           "Con te", // Italian
           "Com você", // Portuguese
           "Met u", // Dutch
           "С вами", // Russian
           "与你", // Chinese (Simplified)
           "與您", // Chinese (Traditional)
           "あなたと", // Japanese
           "당신과", // Korean
           "معك", // Arabic
           "آپ کے ساتھ", // Urdu
           "আপনার সাথে", // Bengali
           "आपके साथ", // Hindi
           "Sizinle", // Turkish // Azerbaijani
           "Med dig", // Swedish
           "Z tobą", // Polish
           "З вами", // Ukrainian
           "Önnel", // Hungarian
           "Μαζί σας", // Greek
           "איתך", // Hebrew
           "กับคุณ", // Thai
           "Với bạn", // Vietnamese
           "Dengan Anda", // Indonesian // Malay
           "Nawe", // Swahili
           "Cu dumneavoastră", // Romanian
           "S vámi", // Czech
           "Med deg", // Norwegian
           "S vami", // Slovak
           "Med dig", // Danish
           "Amb vostè", // Catalan
           "Teiega", // Estonian
           "S vama", // Serbian
         ],
         strings.icontains(subject.subject, .)
  )
)

// contains logic that impersonates Microsoft
and (
  any(ml.logo_detect(file.message_screenshot()).brands,
      strings.starts_with(.name, "Microsoft")
  )
  or any(attachments,
         .file_type in $file_types_images
         and any(ml.logo_detect(.).brands,
                 strings.starts_with(.name, "Microsoft")
         )
  )
  or regex.icontains(body.html.raw,
                     '<table[^>]*>\s*<tbody[^>]*>\s*<tr[^>]*>\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\s*&nbsp;\s*</td>\s*){2}\s*</tr>\s*<tr[^>]*>\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\s*&nbsp;\s*</td>\s*){2}'
  )
  or 3 of (
    regex.icontains(body.html.raw, '.password-expiration'),
    regex.icontains(body.html.raw, 'color: #2672ec;'),
    regex.icontains(body.html.raw, 'M\x{00AD}ic\x{00AD}ro\x{00AD}so\x{00AD}ft')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(246,\s?93,\s?53\)'),
    regex.icontains(body.html.raw, 'rgb\(129,\s?187,\s?5\)'),
    regex.icontains(body.html.raw, 'rgb\(4,\s?165,\s?240\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?186,\s?7\)'),
  )
  or 4 of (
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)red'
    ),
    regex.icontains(body.html.raw, 'rgb\(19,\s?186,\s?132\)'),
    regex.icontains(body.html.raw, 'rgb\(4,\s?166,\s?240\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?186,\s?8\)'),
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(245,\s?189,\s?67\)'),
    regex.icontains(body.html.raw, 'rgb\(137,\s?184,\s?57\)'),
    regex.icontains(body.html.raw, 'rgb\(217,\s?83,\s?51\)'),
    regex.icontains(body.html.raw, 'rgb\(71,\s?160,\s?218\)')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(73,\s?161,\s?232\)'),
    regex.icontains(body.html.raw, 'rgb\(224,\s?92,\s?53\)'),
    regex.icontains(body.html.raw, 'rgb\(139,\s?183,\s?55\)'),
    regex.icontains(body.html.raw, 'rgb\(244,\s?188,\s?65\)')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(213,\s?56,\s?62\)'),
    regex.icontains(body.html.raw, 'rgb\(0,\s?114,\s?30\)'),
    regex.icontains(body.html.raw, 'rgb\(0,\s?110,\s?173\)'),
    regex.icontains(body.html.raw, 'rgb\(227,\s?209,\s?43\)'),
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(246,\s?93,\s?53\)'),
    regex.icontains(body.html.raw, 'rgb\(129,\s?187,\s?5\)'),
    regex.icontains(body.html.raw, 'rgb\(4,\s?165,\s?240\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?186,\s?7\)')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(242,\s?80,\s?34\)'),
    regex.icontains(body.html.raw, 'rgb\(127,\s?186,\s?0\)'),
    regex.icontains(body.html.raw, 'rgb\(0,\s?164,\s?239\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?185,\s?0\)'),
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(243,\s?83,\s?37\)'),
    regex.icontains(body.html.raw, 'rgb\(129,\s?188,\s?6\)'),
    regex.icontains(body.html.raw, 'rgb\(5,\s?166,\s?240\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?186,\s?8\)')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\(243,\s?80,\s?34\)'),
    regex.icontains(body.html.raw, 'rgb\(128,\s?187,\s?3\)'),
    regex.icontains(body.html.raw, 'rgb\(3,\s?165,\s?240\)'),
    regex.icontains(body.html.raw, 'rgb\(255,\s?185,\s?3\)')
  )
  or 4 of (
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?(#)?(FF1940|eb5024|F25022|FF1941|red)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?(#)?(36ba57|3eb55d|7db606|7FBA00|36ba58|green)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(04a1d6|04B5F0|05a1e8|00A4EF|01a4ef|04a5f0)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(FFCA07|f7b408|FFB900|FFCA08|ffb901|ffba07)'
    ),
  )
  or 4 of (
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(f65314|f65d35|49a1e8|E74F23|F35325)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(7cbf42|81bb05|e05c35|7AB206|81BC06)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(00a4ef|0078d7|8bb737|04a5f0|059EE4|05A6F0)'
    ),
    regex.icontains(body.html.raw,
                    '(background-color:|background:|bgcolor=)(.)?#(ffb900|ffba07|f4bc41|F2B108|FFBA08)'
    ),
  )
  // fuzzy approach
  or 4 of (
    regex.icontains(body.html.raw,
                    'rgb\((2[1-4][0-9]|250),\s?(7[0-9]|8[0-9]|9[0-3]),\s?(3[0-9]|4[0-9]|5[0-3])\)'
    ),
    regex.icontains(body.html.raw,
                    'rgb\((12[0-9]|13[0-9]),\s?(18[0-9]|190),\s?([0-9]|10)\)'
    ),
    regex.icontains(body.html.raw,
                    'rgb\(([0-9]|1[0-5]),\s?(16[0-5]|166),\s?(23[0-9]|240)\)'
    ),
    regex.icontains(body.html.raw,
                    'rgb\((25[0-5]),\s?(18[5-9]|19[0-9]),\s?([0-9]|10)\)'
    )
  )
  or 4 of (
    regex.icontains(body.html.raw, 'rgb\((25[0-5]),\s?(2[0-5]),\s?(6[0-4])\)'),
    regex.icontains(body.html.raw, 'rgb\((6[0-2]),\s?(18[0-1]),\s?(9[0-3])\)'),
    regex.icontains(body.html.raw, 'rgb\(([0-4]),\s?(18[0-1]),\s?(24[0])\)'),
    regex.icontains(body.html.raw, 'rgb\((25[0-5]),\s?(20[0-2]),\s?([0-7])\)')
  )
  or (
    any(recipients.to,
        strings.icontains(body.current_thread.text,
                          strings.concat(.email.domain.sld,
                                         " shared a file with you"
                          )
        )
    )
  )
  or (
    any(recipients.to,
        strings.icontains(body.current_thread.text,
                          strings.concat("This link will work for ",
                                         .email.email
                          )
        )
    )
  )
  // contains HTML and wording from the sharepoint template
  or (
    (
      // 
      // This rule makes use of a beta feature and is subject to change without notice
      // using the beta feature in custom rules is not suggested until it has been formally released
      // 

      // alt text for the global icon
      length(html.xpath(body.html, '//img[@alt="permission globe icon"]').nodes) > 0
      // reference to the global icon id
      or length(html.xpath(body.html, '//img[@id="Picture_x0020_1"]').nodes) > 0
      // a comment reference the globe icon
      or strings.icontains(body.html.raw,
                           ' <!-- Permission globe icon placeholder -->'
      )
    )
    // the wording from the sharepoint share
    and strings.contains(body.current_thread.text,
                         'This invite will only work for you and people with existing access'
    )
  )
  or any(html.xpath(body.html,
                    "//*[contains(translate(@style, 'ABCDEF', 'abcdef'), 'color:#605e5c')]"
         ).nodes,
         .display_text =~ "Privacy Statement"
  )
  or 2 of (
    strings.icontains(body.current_thread.text,
                      'Microsoft respects your privacy'
    ),
    strings.icontains(body.current_thread.text,
                      'please read our Privacy Statement'
    ),
    strings.icontains(body.current_thread.text,
                      'Microsoft Corporation, One Microsoft Way, Redmond, WA 98052'
    ),
  )
)

// Negate messages when the message-id indciates the message is from MS actual. DKIM/SPF domains can be custom and therefore are unpredictable.
and not (
  strings.starts_with(headers.message_id, '<Share-')
  and strings.ends_with(headers.message_id, '@odspnotify>')
)

// fake Sharepoint shares are easy to identify if there are any links
// that don't point to microsoft[.]com or *.sharepoint[.]com
and not all(body.links,
            .href_url.domain.root_domain in (
              "1drv.ms",
              "aka.ms",
              "microsoft.com",
              "sharepoint.com"
            )
)
// if there is a Sharepoint link, ensure the link doesn't match any org SLDs
and not any(body.links,
            (
              .href_url.domain.root_domain == "sharepoint.com"
              and any($org_slds, . == ..href_url.domain.subdomain)
            )
            or .href_url.domain.domain in $tenant_domains
            or any(.href_url.query_params_decoded["domain"],
                   strings.parse_url(strings.concat("https://", .)).domain.root_domain == "sharepoint.com"
            )
)
and sender.email.domain.root_domain not in $org_domains
and sender.email.domain.root_domain not in (
  "bing.com",
  "microsoft.com",
  "microsoftonline.com",
  "microsoftsupport.com",
  "microsoft365.com",
  "office.com",
  "onedrive.com",
  "sharepointonline.com",
  "yammer.com",
  // ignore microsoft privacy statement links
  "aka.ms"
)
and not (
  (
    (
      strings.istarts_with(subject.subject, "RE:")
      or strings.istarts_with(subject.subject, "R:")
      or strings.istarts_with(subject.subject, "ODG:")
      or strings.istarts_with(subject.subject, "答复:")
      or strings.istarts_with(subject.subject, "AW:")
      or strings.istarts_with(subject.subject, "TR:")
      or strings.istarts_with(subject.subject, "FWD:")
      or regex.imatch(subject.subject, '(\[[^\]]+\]\s?){0,3}(re|fwd?)\s?:')
      or regex.imatch(subject.subject,
                      '^\[?(EXT|EXTERNAL)\]?[: ]\s*(RE|FWD?|FW|AW|TR|ODG|答复):.*'
      )
    )
    and (
      (length(headers.references) > 0 or headers.in_reply_to is not null)
      // ensure that there are actual threads
      and (
        length(body.previous_threads) > 0
        or (length(body.html.display_text) - length(body.current_thread.text)) > 200
      )
    )
  )
)

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
and (
  profile.by_sender().solicited == false
  or profile.by_sender_email().prevalence == "new"
  or profile.by_sender_email().days_since.last_contact > 30
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
  // or it's a spoof of the org_domain
  or (
    sender.email.domain.domain in $org_domains
    and not (
      headers.auth_summary.spf.pass
      or coalesce(headers.auth_summary.dmarc.pass, false)
    )
  )
)
and not profile.by_sender().any_messages_benign

Detection logic

Scope: inbound message.

This rule detects messages impersonating a Sharepoint file sharing email where no links point to known Microsoft domains.

inbound message
any of:
- all of:
  - any of:
    
    any of [body.current_thread.text, body.plain.raw] where:
    
    . matches any of 7 patterns
    
    *shared a file with you*
    *shared with you*
    *invited you to access a file*
    *received a document*
    *shared a document*
    *shared a new document*
    *shared this document*
    any of ml.nlu_classifier(body.current_thread.text).topics where all hold:
    
    .name is 'File Sharing and Cloud Services'
    .confidence is 'high'
    beta.ocr(file.message_screenshot()).text matches any of 7 patterns
    
    *shared a file with you*
    *shared with you*
    *invited you to access a file*
    *received a document*
    *shared a document*
    *shared a new document*
    *shared this document*
    any of ml.nlu_classifier(beta.ocr(file.message_screenshot()).text).topics where all hold:
    
    .name is 'File Sharing and Cloud Services'
    .confidence is 'high'
  - any of:
    
    subject.subject matches any of 5 patterns
    
    *shared*
    *updated*
    *sign*
    *review*
    *scanned*
    subject.subject matches any of 4 patterns
    
    *Excel*
    *SharePoint*
    *PowerPoint*
    *OneNote*
    sender.display_name matches any of 4 patterns
    
    *Excel*
    *SharePoint*
    *PowerPoint*
    *OneNote*
    any of body.links where:
    
    .display_text contains 'OPEN DOCUMENT'
    subject.subject is missing
    subject.subject is ''
    any of ml.nlu_classifier(body.current_thread.text).entities where all hold:
    
    .name is 'org'
    strings.icontains(subject.subject)
- any of ['Contigo', 'Avec vous', 'Mit Ihnen', 'Con te', 'Com você', 'Met u', 'С вами', '与你', '與您', 'あなたと', '당신과', 'معك', 'آپ کے ساتھ', 'আপনার সাথে', 'आपके साथ', 'Sizinle', 'Med dig', 'Z tobą', 'З вами', 'Önnel', 'Μαζί σας', 'איתך', 'กับคุณ', 'Với bạn', 'Dengan Anda', 'Nawe', 'Cu dumneavoastră', 'S vámi', 'Med deg', 'S vami', 'Med dig', 'Amb vostè', 'Teiega', 'S vama'] where:
  - strings.icontains(subject.subject)
any of:
- any of ml.logo_detect(file.message_screenshot()).brands where:
  - .name starts with 'Microsoft'
- any of attachments where all hold:
  - .file_type in $file_types_images
  - any of ml.logo_detect(.).brands where:
    
    .name starts with 'Microsoft'
- body.html.raw matches '<table[^>]*>\\s*<tbody[^>]*>\\s*<tr[^>]*>\\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\\s* \\s*</td>\\s*){2}\\s*</tr>\\s*<tr[^>]*>\\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\\s* \\s*</td>\\s*){2}'
- at least 3 of:
  - body.html.raw matches '.password-expiration'
  - body.html.raw matches 'color: #2672ec;'
  - body.html.raw matches 'M\\x{00AD}ic\\x{00AD}ro\\x{00AD}so\\x{00AD}ft'
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$246,\s?93,\s?53$
  - rgb$129,\s?187,\s?5$
  - rgb$4,\s?165,\s?240$
  - rgb$255,\s?186,\s?7$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - (background-color:|background:|bgcolor=)(.)red
  - rgb$19,\s?186,\s?132$
  - rgb$4,\s?166,\s?240$
  - rgb$255,\s?186,\s?8$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$245,\s?189,\s?67$
  - rgb$137,\s?184,\s?57$
  - rgb$217,\s?83,\s?51$
  - rgb$71,\s?160,\s?218$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$73,\s?161,\s?232$
  - rgb$224,\s?92,\s?53$
  - rgb$139,\s?183,\s?55$
  - rgb$244,\s?188,\s?65$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$213,\s?56,\s?62$
  - rgb$0,\s?114,\s?30$
  - rgb$0,\s?110,\s?173$
  - rgb$227,\s?209,\s?43$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$246,\s?93,\s?53$
  - rgb$129,\s?187,\s?5$
  - rgb$4,\s?165,\s?240$
  - rgb$255,\s?186,\s?7$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$242,\s?80,\s?34$
  - rgb$127,\s?186,\s?0$
  - rgb$0,\s?164,\s?239$
  - rgb$255,\s?185,\s?0$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$243,\s?83,\s?37$
  - rgb$129,\s?188,\s?6$
  - rgb$5,\s?166,\s?240$
  - rgb$255,\s?186,\s?8$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$243,\s?80,\s?34$
  - rgb$128,\s?187,\s?3$
  - rgb$3,\s?165,\s?240$
  - rgb$255,\s?185,\s?3$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - (background-color:|background:|bgcolor=)(.)?(#)?(FF1940|eb5024|F25022|FF1941|red)
  - (background-color:|background:|bgcolor=)(.)?(#)?(36ba57|3eb55d|7db606|7FBA00|36ba58|green)
  - (background-color:|background:|bgcolor=)(.)?#(04a1d6|04B5F0|05a1e8|00A4EF|01a4ef|04a5f0)
  - (background-color:|background:|bgcolor=)(.)?#(FFCA07|f7b408|FFB900|FFCA08|ffb901|ffba07)
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - (background-color:|background:|bgcolor=)(.)?#(f65314|f65d35|49a1e8|E74F23|F35325)
  - (background-color:|background:|bgcolor=)(.)?#(7cbf42|81bb05|e05c35|7AB206|81BC06)
  - (background-color:|background:|bgcolor=)(.)?#(00a4ef|0078d7|8bb737|04a5f0|059EE4|05A6F0)
  - (background-color:|background:|bgcolor=)(.)?#(ffb900|ffba07|f4bc41|F2B108|FFBA08)
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$(2[1-4][0-9]|250),\s?(7[0-9]|8[0-9]|9[0-3]),\s?(3[0-9]|4[0-9]|5[0-3])$
  - rgb$(12[0-9]|13[0-9]),\s?(18[0-9]|190),\s?([0-9]|10)$
  - rgb$([0-9]|1[0-5]),\s?(16[0-5]|166),\s?(23[0-9]|240)$
  - rgb$(25[0-5]),\s?(18[5-9]|19[0-9]),\s?([0-9]|10)$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - rgb$(25[0-5]),\s?(2[0-5]),\s?(6[0-4])$
  - rgb$(6[0-2]),\s?(18[0-1]),\s?(9[0-3])$
  - rgb$([0-4]),\s?(18[0-1]),\s?(24[0])$
  - rgb$(25[0-5]),\s?(20[0-2]),\s?([0-7])$
- any of recipients.to where:
  - strings.icontains(body.current_thread.text)
- any of recipients.to where:
  - strings.icontains(body.current_thread.text)
- all of:
  - any of:
    
    length(html.xpath(body.html, '//img[@alt="permission globe icon"]').nodes) > 0
    length(html.xpath(body.html, '//img[@id="Picture_x0020_1"]').nodes) > 0
    body.html.raw contains ' '
  - body.current_thread.text contains 'This invite will only work for you and people with existing access'
- any of html.xpath(body.html, "//*[contains(translate(@style, 'ABCDEF', 'abcdef'), 'color:#605e5c')]").nodes where:
  - .display_text is 'Privacy Statement'
- at least 2 of:
  - body.current_thread.text contains 'Microsoft respects your privacy'
  - body.current_thread.text contains 'please read our Privacy Statement'
  - body.current_thread.text contains 'Microsoft Corporation, One Microsoft Way, Redmond, WA 98052'
not:
- all of:
  - headers.message_id starts with '<Share-'
  - headers.message_id ends with '@odspnotify>'
not:
- all of body.links where:
  - .href_url.domain.root_domain in ('1drv.ms', 'aka.ms', 'microsoft.com', 'sharepoint.com')
not:
- any of body.links where any holds:
  - all of:
    
    .href_url.domain.root_domain is 'sharepoint.com'
    any of $org_slds where:
    
    . is .href_url.domain.subdomain
  - .href_url.domain.domain in $tenant_domains
  - any of .href_url.query_params_decoded['domain'] where:
    
    strings.parse_url(strings.concat('https://', .)).domain.root_domain is 'sharepoint.com'
sender.email.domain.root_domain not in $org_domains
sender.email.domain.root_domain not in ('bing.com', 'microsoft.com', 'microsoftonline.com', 'microsoftsupport.com', 'microsoft365.com', 'office.com', 'onedrive.com', 'sharepointonline.com', 'yammer.com', 'aka.ms')
not:
- all of:
  - any of:
    
    subject.subject starts with 'RE:'
    subject.subject starts with 'R:'
    subject.subject starts with 'ODG:'
    subject.subject starts with '答复:'
    subject.subject starts with 'AW:'
    subject.subject starts with 'TR:'
    subject.subject starts with 'FWD:'
    subject.subject matches '(\\[[^\\]]+\\]\\s?){0,3}(re|fwd?)\\s?:'
    subject.subject matches '^\\[?(EXT|EXTERNAL)\\]?[: ]\\s*(RE|FWD?|FW|AW|TR|ODG|答复):.*'
  - all of:
    
    any of:
    
    length(headers.references) > 0
    headers.in_reply_to is set
    any of:
    
    length(body.previous_threads) > 0
    length(body.html.display_text) - length(body.current_thread.text) > 200
any of:
- all of:
  - sender.email.domain.root_domain in $high_trust_sender_root_domains
  - not:
    
    headers.auth_summary.dmarc.pass
- sender.email.domain.root_domain not in $high_trust_sender_root_domains
any of:
- profile.by_sender().solicited is False
- profile.by_sender_email().prevalence is 'new'
- profile.by_sender_email().days_since.last_contact > 30
- all of:
  - profile.by_sender().any_messages_malicious_or_spam
  - not:
    
    profile.by_sender().any_messages_benign
- all of:
  - sender.email.domain.domain in $org_domains
  - none of:
    
    headers.auth_summary.spf.pass
    coalesce(headers.auth_summary.dmarc.pass)
not:
- profile.by_sender().any_messages_benign

Inspects: attachments[].file_type, body.current_thread.text, body.html, body.html.raw, body.links, body.links[].display_text, body.links[].href_url.domain.domain, body.links[].href_url.domain.root_domain, body.links[].href_url.domain.subdomain, body.links[].href_url.query_params_decoded['domain'], body.plain.raw, body.previous_threads, headers.auth_summary.dmarc.pass, headers.auth_summary.spf.pass, headers.in_reply_to, headers.message_id, headers.references, recipients.to, recipients.to[].email.domain.sld, recipients.to[].email.email, sender.display_name, sender.email.domain.domain, sender.email.domain.root_domain, subject.subject, type.inbound. Sensors: beta.ocr, file.message_screenshot, html.xpath, ml.logo_detect, ml.nlu_classifier, profile.by_sender, profile.by_sender_email, regex.icontains, regex.imatch, strings.concat, strings.contains, strings.ends_with, strings.icontains, strings.ilike, strings.istarts_with, strings.parse_url, strings.starts_with. Reference lists: $file_types_images, $high_trust_sender_root_domains, $org_domains, $org_slds, $tenant_domains.

Indicators matched (107)

Field	Match	Value
`strings.ilike`	substring	`shared a file with you`
`strings.ilike`	substring	`shared with you`
`strings.ilike`	substring	`invited you to access a file`
`strings.ilike`	substring	`received a document`
`strings.ilike`	substring	`shared a document`
`strings.ilike`	substring	`shared a new document`
`strings.ilike`	substring	`shared this document`
`ml.nlu_classifier(body.current_thread.text).topics[].name`	equals	`File Sharing and Cloud Services`
`ml.nlu_classifier(body.current_thread.text).topics[].confidence`	equals	`high`
`ml.nlu_classifier(beta.ocr(file.message_screenshot()).text).topics[].name`	equals	`File Sharing and Cloud Services`
`ml.nlu_classifier(beta.ocr(file.message_screenshot()).text).topics[].confidence`	equals	`high`
`strings.ilike`	substring	`shared`

95 more

`strings.ilike`	substring	`updated`
`strings.ilike`	substring	`sign`
`strings.ilike`	substring	`review`
`strings.ilike`	substring	`scanned`
`strings.ilike`	substring	`Excel`
`strings.ilike`	substring	`SharePoint`
`strings.ilike`	substring	`PowerPoint`
`strings.ilike`	substring	`OneNote`
`strings.icontains`	substring	`OPEN DOCUMENT`
`subject.subject`	equals
`ml.nlu_classifier(body.current_thread.text).entities[].name`	equals	`org`
`strings.starts_with`	prefix	`Microsoft`
`regex.icontains`	regex	`<table[^>]>\s<tbody[^>]>\s<tr[^>]>\s(<td[^>]bgcolor="#[0-9A-Fa-f]{6}"[^>]>\s* \s</td>\s){2}\s</tr>\s<tr[^>]>\s(<td[^>]bgcolor="#[0-9A-Fa-f]{6}"[^>]>\s* \s</td>\s){2}`
`regex.icontains`	regex	`.password-expiration`
`regex.icontains`	regex	`color: #2672ec;`
`regex.icontains`	regex	`M\x{00AD}ic\x{00AD}ro\x{00AD}so\x{00AD}ft`
`regex.icontains`	regex	`rgb$246,\s?93,\s?53$`
`regex.icontains`	regex	`rgb$129,\s?187,\s?5$`
`regex.icontains`	regex	`rgb$4,\s?165,\s?240$`
`regex.icontains`	regex	`rgb$255,\s?186,\s?7$`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)red`
`regex.icontains`	regex	`rgb$19,\s?186,\s?132$`
`regex.icontains`	regex	`rgb$4,\s?166,\s?240$`
`regex.icontains`	regex	`rgb$255,\s?186,\s?8$`
`regex.icontains`	regex	`rgb$245,\s?189,\s?67$`
`regex.icontains`	regex	`rgb$137,\s?184,\s?57$`
`regex.icontains`	regex	`rgb$217,\s?83,\s?51$`
`regex.icontains`	regex	`rgb$71,\s?160,\s?218$`
`regex.icontains`	regex	`rgb$73,\s?161,\s?232$`
`regex.icontains`	regex	`rgb$224,\s?92,\s?53$`
`regex.icontains`	regex	`rgb$139,\s?183,\s?55$`
`regex.icontains`	regex	`rgb$244,\s?188,\s?65$`
`regex.icontains`	regex	`rgb$213,\s?56,\s?62$`
`regex.icontains`	regex	`rgb$0,\s?114,\s?30$`
`regex.icontains`	regex	`rgb$0,\s?110,\s?173$`
`regex.icontains`	regex	`rgb$227,\s?209,\s?43$`
`regex.icontains`	regex	`rgb$242,\s?80,\s?34$`
`regex.icontains`	regex	`rgb$127,\s?186,\s?0$`
`regex.icontains`	regex	`rgb$0,\s?164,\s?239$`
`regex.icontains`	regex	`rgb$255,\s?185,\s?0$`
`regex.icontains`	regex	`rgb$243,\s?83,\s?37$`
`regex.icontains`	regex	`rgb$129,\s?188,\s?6$`
`regex.icontains`	regex	`rgb$5,\s?166,\s?240$`
`regex.icontains`	regex	`rgb$243,\s?80,\s?34$`
`regex.icontains`	regex	`rgb$128,\s?187,\s?3$`
`regex.icontains`	regex	`rgb$3,\s?165,\s?240$`
`regex.icontains`	regex	`rgb$255,\s?185,\s?3$`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?(#)?(FF1940\|eb5024\|F25022\|FF1941\|red)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?(#)?(36ba57\|3eb55d\|7db606\|7FBA00\|36ba58\|green)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(04a1d6\|04B5F0\|05a1e8\|00A4EF\|01a4ef\|04a5f0)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(FFCA07\|f7b408\|FFB900\|FFCA08\|ffb901\|ffba07)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(f65314\|f65d35\|49a1e8\|E74F23\|F35325)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(7cbf42\|81bb05\|e05c35\|7AB206\|81BC06)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(00a4ef\|0078d7\|8bb737\|04a5f0\|059EE4\|05A6F0)`
`regex.icontains`	regex	`(background-color:\|background:\|bgcolor=)(.)?#(ffb900\|ffba07\|f4bc41\|F2B108\|FFBA08)`
`regex.icontains`	regex	`rgb$(2[1-4][0-9]\|250),\s?(7[0-9]\|8[0-9]\|9[0-3]),\s?(3[0-9]\|4[0-9]\|5[0-3])$`
`regex.icontains`	regex	`rgb$(12[0-9]\|13[0-9]),\s?(18[0-9]\|190),\s?([0-9]\|10)$`
`regex.icontains`	regex	`rgb$([0-9]\|1[0-5]),\s?(16[0-5]\|166),\s?(23[0-9]\|240)$`
`regex.icontains`	regex	`rgb$(25[0-5]),\s?(18[5-9]\|19[0-9]),\s?([0-9]\|10)$`
`regex.icontains`	regex	`rgb$(25[0-5]),\s?(2[0-5]),\s?(6[0-4])$`
`regex.icontains`	regex	`rgb$(6[0-2]),\s?(18[0-1]),\s?(9[0-3])$`
`regex.icontains`	regex	`rgb$([0-4]),\s?(18[0-1]),\s?(24[0])$`
`regex.icontains`	regex	`rgb$(25[0-5]),\s?(20[0-2]),\s?([0-7])$`
`strings.icontains`	substring	`<!-- Permission globe icon placeholder -->`
`strings.contains`	substring	`This invite will only work for you and people with existing access`
`html.xpath(body.html, "//*[contains(translate(@style, 'ABCDEF', 'abcdef'), 'color:#605e5c')]").nodes[].display_text`	equals	`Privacy Statement`
`strings.icontains`	substring	`Microsoft respects your privacy`
`strings.icontains`	substring	`please read our Privacy Statement`
`strings.icontains`	substring	`Microsoft Corporation, One Microsoft Way, Redmond, WA 98052`
`strings.starts_with`	prefix	`<Share-`
`strings.ends_with`	suffix	`@odspnotify>`
`body.links[].href_url.domain.root_domain`	member	`1drv.ms`
`body.links[].href_url.domain.root_domain`	member	`aka.ms`
`body.links[].href_url.domain.root_domain`	member	`microsoft.com`
`body.links[].href_url.domain.root_domain`	member	`sharepoint.com`
`body.links[].href_url.domain.root_domain`	equals	`sharepoint.com`
`sender.email.domain.root_domain`	member	`bing.com`
`sender.email.domain.root_domain`	member	`microsoft.com`
`sender.email.domain.root_domain`	member	`microsoftonline.com`
`sender.email.domain.root_domain`	member	`microsoftsupport.com`
`sender.email.domain.root_domain`	member	`microsoft365.com`
`sender.email.domain.root_domain`	member	`office.com`
`sender.email.domain.root_domain`	member	`onedrive.com`
`sender.email.domain.root_domain`	member	`sharepointonline.com`
`sender.email.domain.root_domain`	member	`yammer.com`
`sender.email.domain.root_domain`	member	`aka.ms`
`strings.istarts_with`	prefix	`RE:`
`strings.istarts_with`	prefix	`R:`
`strings.istarts_with`	prefix	`ODG:`
`strings.istarts_with`	prefix	`答复:`
`strings.istarts_with`	prefix	`AW:`
`strings.istarts_with`	prefix	`TR:`
`strings.istarts_with`	prefix	`FWD:`
`regex.imatch`	regex	`(\[[^\]]+\]\s?){0,3}(re\|fwd?)\s?:`
`regex.imatch`	regex	`^\[?(EXT\|EXTERNAL)\]?[: ]\s(RE\|FWD?\|FW\|AW\|TR\|ODG\|答复):.`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)