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Create abuse_dropbox_sus_names.yml #2077
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Create abuse_dropbox_sus_names.yml
zoomequipd f7e14d1
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Update abuse_dropbox_sus_names.yml
zoomequipd 81523a0
Update abuse_dropbox_sus_names.yml
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Merge branch 'main' into zoomequipd-patch-21
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| name: "Service Abuse: DropBox Share with Suspicious Sender or Document Name" | ||
| description: "The detection rule is intended to match on messages sent from DropBox indicating a shared file to the recipient which contains suspicious content within the document or sender display name." | ||
| type: "rule" | ||
| severity: "medium" | ||
| source: | | ||
| type.inbound | ||
|
|
||
| // Legitimate Dropbox sending infratructure | ||
| and sender.email.email == "[email protected]" | ||
| and headers.auth_summary.spf.pass | ||
| and headers.auth_summary.dmarc.pass | ||
| and strings.ends_with(headers.auth_summary.spf.details.designator, | ||
| '.dropbox.com' | ||
| ) | ||
| and strings.icontains(subject.subject, 'shared') | ||
| and strings.icontains(subject.subject, 'with you') | ||
| and ( | ||
| // contains the word dropbox | ||
| // everything not "shared" and "with you" is actor controlled | ||
| strings.icontains(subject.subject, 'dropbox') | ||
| or strings.icontains(subject.subject, 'sharefile') | ||
|
|
||
| // sender names part of the subject | ||
| or ( | ||
| // Billing Accounting | ||
| regex.icontains(subject.subject, | ||
| 'Accounts? (?:Payable|Receivable).*shared', | ||
| 'Billing Support.*shared' | ||
| ) | ||
|
|
||
| // HR/Payroll/Legal/etc | ||
| or regex.icontains(subject.subject, 'Compliance HR.*shared') | ||
| or regex.icontains(subject.subject, | ||
| '(?:Compliance|Executive|Finance|\bHR\b|\bIT\b|Legal|Payroll|Purchasing|Operations|Security|Training|Support).*shared' | ||
| ) | ||
| or regex.icontains(subject.subject, '(?:Department|Team).*shared') | ||
| or regex.icontains(subject.subject, 'Corporate Communications.*shared') | ||
| or regex.icontains(subject.subject, 'Employee Relations.*shared') | ||
| or regex.icontains(subject.subject, 'Office Manager.*shared') | ||
| or regex.icontains(subject.subject, 'Risk Management.*shared') | ||
| or regex.icontains(subject.subject, 'Payroll Admin(?:istrator).*shared') | ||
| or regex.icontains(subject.subject, 'Human Resources.*shared') | ||
| or regex.icontains(subject.subject, 'HR.*shared') | ||
|
|
||
| // IT related | ||
| or regex.icontains(subject.subject, | ||
| 'IT Support.*shared', | ||
| 'Information Technology.*shared', | ||
| '(?:Network|System)? Admin(?:istrator).*shared', | ||
| 'Help Desk.*shared', | ||
| 'Tech(?:nical) Support.*shared' | ||
| ) | ||
|
|
||
| // an email address in the subject is also interesting | ||
| or regex.icontains(subject.subject, '\w+@\w+\.\w+.*shared') | ||
| ) | ||
| // filename analysis | ||
| // the filename is also contianed in the subject line | ||
| or | ||
| ( | ||
| // scanner themed | ||
| regex.icontains(subject.subject, 'shared.*\".*scanne[rd]') | ||
| // image theme | ||
| or regex.icontains(subject.subject, 'shared.*\".*_IMG_') | ||
| or regex.icontains(subject.subject, 'shared.*\".*IMG[_-](?:\d|\W)+\"') | ||
| // ondrive theme | ||
| or regex.icontains(subject.subject, 'shared.*\".*one_docx') | ||
| or regex.icontains(subject.subject, 'shared.*\".*One.?Drive') | ||
| or regex.icontains(subject.subject, 'shared.*\".*click here') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Download PDF') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Validate') | ||
|
|
||
| // Invoice Themes | ||
| or regex.icontains(subject.subject, 'shared.*\".*Invoice') | ||
| or regex.icontains(subject.subject, 'shared.*\".*INV\b') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Payment') | ||
| or regex.icontains(subject.subject, 'shared.*\".*ACH') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Wire Confirmation') | ||
| or regex.icontains(subject.subject, 'shared.*\".*P[O0]\W+?\d+\"') | ||
| or regex.icontains(subject.subject, 'shared.*\"P[O0](?:\W+?|\d+)') | ||
| or regex.icontains(subject.subject, 'shared.*\".*receipt') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Billing') | ||
| or regex.icontains(subject.subject, 'shared.*\".*statement') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Past Due') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Remit(?:tance)?') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Purchase Order') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Settlement') | ||
|
|
||
| // contract language | ||
| or regex.icontains(subject.subject, 'shared.*\".*Contract Agreement') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Pr[0o]p[0o]sal') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Contract Doc') | ||
|
|
||
| or regex.icontains(subject.subject, 'shared.*\".*Claim Doc') | ||
|
|
||
| // Payroll/HR | ||
| or regex.icontains(subject.subject, 'shared.*\".*Payroll') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Employee Pay\b') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Salary') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Benefit Enrollment') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Employee Handbook') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Reimbursement Approved') | ||
|
|
||
|
|
||
| // shared files/extenstion | ||
| or regex.icontains(subject.subject, 'shared.*\".*Shared.?File') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Urgent') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Important') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Secure') | ||
| or regex.icontains(subject.subject, 'shared.*\".*Encrypt') | ||
| or regex.icontains(subject.subject, 'shared.*\".*shared') | ||
| or regex.icontains(subject.subject, 'shared.*\".*protected') | ||
| or regex.icontains(subject.subject, 'shared.*\".*\.docx?\.pdf') | ||
| or regex.icontains(subject.subject, 'shared.*\".*\.docx?\.paper') | ||
| // all caps filename allowing for numbers, punct and spaces, and an optional file extenstion | ||
| or regex.contains(subject.subject, | ||
| 'shared \"[A-Z0-9[:punct:]\s]+(?:\.[a-zA-Z]{3,5})\"' | ||
| ) | ||
| or regex.icontains(subject.subject, | ||
| 'shared \".*(?:shared|sent).*\" with you' | ||
| ) | ||
|
|
||
| // MFA theme | ||
| or regex.icontains(subject.subject, 'shared.*\".*Verification Code') | ||
| or regex.icontains(subject.subject, 'shared.*\".*\bMFA\b') | ||
|
|
||
| // the reply-to address is within the subject | ||
| or any(headers.reply_to, | ||
| strings.icontains(subject.subject, .email.domain.domain) | ||
| ) | ||
| ) | ||
| ) | ||
|
|
||
| attack_types: | ||
| - "Callback Phishing" | ||
| - "BEC/Fraud" | ||
| tactics_and_techniques: | ||
| - "Evasion" | ||
| - "Social engineering" | ||
| detection_methods: | ||
| - "Sender analysis" | ||
| - "Header analysis" | ||
| - "Content analysis" | ||
| id: "27007c9f-e738-584f-8b49-74710f9ef9a6" | ||
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