sublimehighRule

Recruitee Infrastructure Abuse

Identifies inbound messages from Recruitee domains containing recruitment-related topics and application links, where the sender has limited prior history. The URLs in these messages either point to recently registered domains or appear as standalone links with application-focused text.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1566.001 T1598 T1598.003

initial-access

Detection Query

type.inbound
and sender.email.domain.root_domain == "recruitee.com"
and any(beta.ml_topic(body.current_thread.text).topics,
        .name in (
          "Advertising and Promotions",
          "Professional and Career Development"
        )
        and .confidence != "low"
)
and any(body.links,
        (
          network.whois(.href_url.domain).days_old < 30
          or length(body.links) == 1
        )
        and regex.icontains(.display_text, "apply|submit")
)
// use sender email, not domain, to ensure new *.recruitee.com addresses are correctly identified
and profile.by_sender_email().prevalence in ("new", "outlier")
and not profile.by_sender_email().any_messages_benign

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Recruitee Infrastructure Abuse"
description: "Identifies inbound messages from Recruitee domains containing recruitment-related topics and application links, where the sender has limited prior history. The URLs in these messages either point to recently registered domains or appear as standalone links with application-focused text."
type: "rule"
severity: "high"
source: |
  type.inbound
  and sender.email.domain.root_domain == "recruitee.com"
  and any(beta.ml_topic(body.current_thread.text).topics,
          .name in (
            "Advertising and Promotions",
            "Professional and Career Development"
          )
          and .confidence != "low"
  )
  and any(body.links,
          (
            network.whois(.href_url.domain).days_old < 30
            or length(body.links) == 1
          )
          and regex.icontains(.display_text, "apply|submit")
  )
  // use sender email, not domain, to ensure new *.recruitee.com addresses are correctly identified
  and profile.by_sender_email().prevalence in ("new", "outlier")
  and not profile.by_sender_email().any_messages_benign

attack_types:
  - "BEC/Fraud"
  - "Credential Phishing"
tactics_and_techniques:
  - "Impersonation: Brand"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "Natural Language Understanding"
  - "Sender analysis"
  - "URL analysis"
  - "Whois"
id: "31cab83d-f279-5db4-a0e5-c81a6e6e3d68"