Detection rules › Sublime MQL
Open redirect: buildingengines.com
Detects messages containing buildingengines.com redirect links that use the _redirectTo parameter to redirect users to malicious sites. This has been observed in phishing campaigns.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing, Malware/Ransomware |
| Tactics and techniques | Open redirect |
Event coverage
| Message attribute |
|---|
| body |
| body.links (collection) |
| headers.auth_summary |
| sender.email |
| type |
Rule body MQL
type.inbound
and any(body.links,
// Look for buildingengines URLs
.href_url.domain.domain == "app.buildingengines.com"
and strings.icontains(.href_url.query_params, '_redirectTo=')
// Make sure it's not redirecting back to buildingengines.com
and not regex.icontains(.href_url.query_params,
'_redirectTo=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*buildingengines\.com(?:\&|\/|$|%2f)'
)
)
// Exclude legitimate Building Engines domains as senders
and not sender.email.domain.root_domain == "buildingengines.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 $high_trust_sender_root_domains
)
Detection logic
Scope: inbound message.
Detects messages containing buildingengines.com redirect links that use the _redirectTo parameter to redirect users to malicious sites. This has been observed in phishing campaigns.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.domain is 'app.buildingengines.com'
- .href_url.query_params contains '_redirectTo='
not:
- .href_url.query_params matches '_redirectTo=(?:https?(?:%3a|:))?(?:%2f|\\/){2}[^&]*buildingengines\\.com(?:\\&|\\/|$|%2f)'
not:
- sender.email.domain.root_domain is 'buildingengines.com'
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.domain, 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: $high_trust_sender_root_domains.
Indicators matched (4)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.domain.domain | equals | app.buildingengines.com |
strings.icontains | substring | _redirectTo= |
regex.icontains | regex | _redirectTo=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*buildingengines\.com(?:\&|\/|$|%2f) |
sender.email.domain.root_domain | equals | buildingengines.com |