sublimemediumRule

Brand impersonation: Evite

Detects messages impersonating Evite invitations by looking for invitation language while not originating from legitimate Evite domains.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1598.003

initial-access

Detection Query

type.inbound
and strings.contains(body.html.raw, 'evitecdn.com')
and length(filter(html.xpath(body.html, '//img/@src').nodes,
                  // calling parse_url allows url decoding to help us
                  strings.parse_url(.raw).domain.root_domain == 'evitecdn.com'
           )
) >= 2
and length(filter(body.links,
                  .href_url.domain.root_domain == "evite.com"
                  and regex.contains(.href_url.path, '^/_ct/[a-f0-9]{40}/')
           )
) < 3
and not (
  (subject.is_forward or subject.is_reply)
  and (length(headers.references) != 0 or headers.in_reply_to is not null)
  and length(body.previous_threads) > 0
)
and not (
  sender.email.domain.root_domain == "evite.com"
  and headers.auth_summary.dmarc.pass
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Brand impersonation: Evite"
description: "Detects messages impersonating Evite invitations by looking for invitation language while not originating from legitimate Evite domains."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and strings.contains(body.html.raw, 'evitecdn.com')
  and length(filter(html.xpath(body.html, '//img/@src').nodes,
                    // calling parse_url allows url decoding to help us
                    strings.parse_url(.raw).domain.root_domain == 'evitecdn.com'
             )
  ) >= 2
  and length(filter(body.links,
                    .href_url.domain.root_domain == "evite.com"
                    and regex.contains(.href_url.path, '^/_ct/[a-f0-9]{40}/')
             )
  ) < 3
  and not (
    (subject.is_forward or subject.is_reply)
    and (length(headers.references) != 0 or headers.in_reply_to is not null)
    and length(body.previous_threads) > 0
  )
  and not (
    sender.email.domain.root_domain == "evite.com"
    and headers.auth_summary.dmarc.pass
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Impersonation: Brand"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "Sender analysis"
id: "9e867a2b-0175-5d8a-b22f-29bfb3ba6a60"