Service Abuse: QuickBooks Notification From New Domain

This Attack Surface Reduction (ASR) rule matches on QuickBooks notifications with recently registered reply-to domains.

Sublime rule (View on GitHub)

 1name: "Service Abuse: QuickBooks Notification From New Domain"
 2description: "This Attack Surface Reduction (ASR) rule matches on QuickBooks notifications with recently registered reply-to domains."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  
 8  // Legitimate Intuit sending infratructure
 9  and sender.email.email == "quickbooks@notification.intuit.com"
10  and headers.auth_summary.spf.pass
11  and headers.auth_summary.dmarc.pass
12  and strings.ends_with(headers.auth_summary.spf.details.designator,
13                        '.intuit.com'
14  )
15  
16  // remove payment confirmation messages
17  and not strings.starts_with(subject.subject, 'Payment confirmation:')
18  
19  // the message needs to have a reply-to address
20  and length(headers.reply_to) > 0
21  
22  // reply-to email address has never received an email from your org
23  and not any(headers.reply_to, .email.email in $recipient_emails)
24  
25  // new reply-to
26  and any(filter(headers.reply_to,
27                 // negate .com.au which doesn't provide created date for domains
28                 .email.domain.tld not in ('com.au')
29          ),
30          network.whois(.email.domain).days_old < 30
31  )  
32tags:
33 - "Attack surface reduction"
34attack_types:
35  - "Callback Phishing"
36  - "Credential Phishing"
37  - "BEC/Fraud"
38tactics_and_techniques:
39  - "Evasion"
40  - "Social engineering"
41detection_methods:
42  - "Content analysis"
43  - "Sender analysis"
44  - "Header analysis"
45id: "c4f46473-0f5a-56d6-bb7e-489460bdb20f"

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