Detection rules › Sublime MQL
Open redirect: mail.spiceworks.com
Message contains use of the mail.spiceworks.com redirect. This has been exploited in the wild.
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 == "mail.spiceworks.com"
and strings.icontains(.href_url.query_params,
'_externalContentRedirect'
)
and not regex.icontains(.href_url.query_params,
'_externalContentRedirect=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*spiceworks\.com(?:\&|\/|$|%2f)'
)
)
and not sender.email.domain.root_domain == "spiceworks.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 $high_trust_sender_root_domains
)
Detection logic
Scope: inbound message.
Message contains use of the mail.spiceworks.com redirect. This has been exploited in the wild.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.domain is 'mail.spiceworks.com'
- .href_url.query_params contains '_externalContentRedirect'
not:
- .href_url.query_params matches '_externalContentRedirect=(?:https?(?:%3a|:))?(?:%2f|\\/){2}[^&]*spiceworks\\.com(?:\\&|\\/|$|%2f)'
not:
- sender.email.domain.root_domain is 'spiceworks.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: $high_trust_sender_root_domains.
Indicators matched (4)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.domain.domain | equals | mail.spiceworks.com |
strings.icontains | substring | _externalContentRedirect |
regex.icontains | regex | _externalContentRedirect=(?:https?(?:%3a|:))?(?:%2f|\/){2}[^&]*spiceworks\.com(?:\&|\/|$|%2f) |
sender.email.domain.root_domain | equals | spiceworks.com |