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Detection rules › Sublime MQL

Open redirect: designsori.com

Severity
medium
Type
rule
Source
github.com/sublime-security/sublime-rules

Message contains use of the designsori.com open redirect. This has been exploited in the wild.

Threat classification

Sublime's own taxonomy (not MITRE ATT&CK).

CategoryValues
Attack typesCredential Phishing, Malware/Ransomware
Tactics and techniquesOpen redirect

Event coverage

Message attribute
body
body.links (collection)
headers.auth_summary
sender.email
type

Rule body MQL

type.inbound
and any(body.links,
        .href_url.domain.root_domain == "designsori.com"
        and strings.icontains(.href_url.path, 'redirect.php')
        and regex.icontains(.href_url.query_params,
                            'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}'
        )
        and not regex.icontains(.href_url.query_params,
                                'url=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*designsori\.com(?:\&|\/|$)'
        )
)
and not sender.email.domain.root_domain == "designsori.com"

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)

Detection logic

Scope: inbound message.

Message contains use of the designsori.com open redirect. This has been exploited in the wild.

  1. inbound message
  2. any of body.links where all hold:
    • .href_url.domain.root_domain is 'designsori.com'
    • .href_url.path contains 'redirect.php'
    • .href_url.query_params matches 'url=(?:https?(?:%3a|:))?(?:%2f|\\/){2}'
    • not:
      • .href_url.query_params matches 'url=(?:https?(?:%3a|:))?(?:%2f|\\/){2}[^&]*designsori\\.com(?:\\&|\\/|$)'
  3. not:
    • sender.email.domain.root_domain is 'designsori.com'
  4. any of:
    • all of:
      • sender.email.domain.root_domain in $high_trust_sender_root_domains
      • not:
        • headers.auth_summary.dmarc.pass
    • sender.email.domain.root_domain not in $high_trust_sender_root_domains

Inspects: body.links, body.links[].href_url.domain.root_domain, body.links[].href_url.path, body.links[].href_url.query_params, headers.auth_summary.dmarc.pass, sender.email.domain.root_domain, type.inbound. Sensors: regex.icontains, strings.icontains. Reference lists: $high_trust_sender_root_domains.

Indicators matched (5)

FieldMatchValue
body.links[].href_url.domain.root_domainequalsdesignsori.com
strings.icontainssubstringredirect.php
regex.icontainsregexurl=(?:https?(?:%3a|:))?(?:%2f|\/){2}
regex.icontainsregexurl=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*designsori\.com(?:\&|\/|$)
sender.email.domain.root_domainequalsdesignsori.com