Detection rules › Sublime MQL
Open redirect: City of Calgary
Message contains use of calgary.ca's open redirect but the sender is not the City of Calgary.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing |
| Tactics and techniques | Exploit, Open redirect, Social engineering |
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 == 'calgary.ca'
and .href_url.path =~ '/_layouts/cocis/DirectDownload.aspx'
and strings.icontains(.href_url.query_params, "redirect")
)
and sender.email.domain.root_domain != 'calgary.ca'
// 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 calgary.ca's open redirect but the sender is not the City of Calgary.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.root_domain is 'calgary.ca'
- .href_url.path is '/_layouts/cocis/DirectDownload.aspx'
- .href_url.query_params contains 'redirect'
- sender.email.domain.root_domain is not 'calgary.ca'
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: strings.icontains. Reference lists: $high_trust_sender_root_domains.
Indicators matched (3)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.domain.root_domain | equals | calgary.ca |
body.links[].href_url.path | equals | /_layouts/cocis/DirectDownload.aspx |
strings.icontains | substring | redirect |