Detection rules › Sublime MQL
Open redirect: next2.io
Message contains use of a next.io redirect. This redirection has been abused by threat actors in the wild.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing |
| Tactics and techniques | Evasion, 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.domain == "c.next2.io"
and .href_url.path =~ "/api/ads"
and strings.icontains(.href_url.query_params, 'fallback_url=')
)
// 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 a next.io redirect. This redirection has been abused by threat actors in the wild.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.domain is 'c.next2.io'
- .href_url.path is '/api/ads'
- .href_url.query_params contains 'fallback_url='
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: strings.icontains. Reference lists: $high_trust_sender_root_domains.
Indicators matched (3)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.domain.domain | equals | c.next2.io |
body.links[].href_url.path | equals | /api/ads |
strings.icontains | substring | fallback_url= |