sublimemediumRule

Link: Multistage Landing - Abused Buildin.ai

Analyzes shared content links from buildin.ai domain that contain credential harvesting language with medium to high confidence in the display text.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598

initial-access

Detection Query

type.inbound

// filter to just buildin.ai
and any(filter(body.links,
               (
                 .href_url.domain.root_domain == "buildin.ai"
                 and strings.icontains(.href_url.path, '/share')
               // inspect display text
               )
        ),
        any(ml.nlu_classifier(ml.link_analysis(., mode="aggressive").final_dom.display_text
            ).intents,
            .name == "cred_theft" and .confidence in ("medium", "high")
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Link: Multistage Landing - Abused Buildin.ai"
description: "Analyzes shared content links from buildin.ai domain that contain credential harvesting language with medium to high confidence in the display text."
type: "rule"
severity: "medium"
source: |
  type.inbound
  
  // filter to just buildin.ai
  and any(filter(body.links,
                 (
                   .href_url.domain.root_domain == "buildin.ai"
                   and strings.icontains(.href_url.path, '/share')
                 // inspect display text
                 )
          ),
          any(ml.nlu_classifier(ml.link_analysis(., mode="aggressive").final_dom.display_text
              ).intents,
              .name == "cred_theft" and .confidence in ("medium", "high")
          )
  )

attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Free file host"
  - "Social engineering"
detection_methods:
  - "URL analysis"
  - "Natural Language Understanding"
id: "e0a79ef5-291e-5492-9449-c17d79f1cb23"