Detection rules › Sublime MQL
Open redirect: business.google.com website_shared URL Param
Detects messages containing an open redirect in business.google.com's website_shared/launch_bw.html endpoint with the 'f' parameter. This has been exploited in phishing campaigns to redirect users to malicious sites.
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,
.href_url.domain.domain == "business.google.com"
and strings.icontains(.href_url.path, '/website_shared/launch_bw.html')
and strings.icontains(.href_url.query_params, 'f=')
// Make sure the redirect is not going back to google.com
and not regex.icontains(.href_url.query_params,
'f=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*google\.com(?:\&|\/|$|%2f)'
)
)
// Exclude legitimate Google domains as senders
and not regex.icontains(sender.email.domain.root_domain, '^google')
// 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 $high_trust_sender_root_domains
)
Detection logic
Scope: inbound message.
Detects messages containing an open redirect in business.google.com's website_shared/launch_bw.html endpoint with the 'f' parameter. This has been exploited in phishing campaigns to redirect users to malicious sites.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.domain is 'business.google.com'
- .href_url.path contains '/website_shared/launch_bw.html'
- .href_url.query_params contains 'f='
not:
- .href_url.query_params matches 'f=(?:https?(?:%3a|:))?(?:%2f|\\/){2}[^&]*google\\.com(?:\\&|\\/|$|%2f)'
not:
- sender.email.domain.root_domain matches '^google'
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.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: $high_trust_sender_root_domains.
Indicators matched (5)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.domain.domain | equals | business.google.com |
strings.icontains | substring | /website_shared/launch_bw.html |
strings.icontains | substring | f= |
regex.icontains | regex | f=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*google\.com(?:\&|\/|$|%2f) |
regex.icontains | regex | ^google |