Detection rules › Sublime MQL
Open redirect: documentmailbox.com
Message contains use of the documentmailbox.com open 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.root_domain == "documentmailbox.com"
and strings.icontains(.href_url.path, 'RedirectTarget.aspx')
and strings.icontains(.href_url.query_params, 'TargetUrl=')
)
and length(filter(body.links,
.href_url.domain.root_domain == "documentmailbox.com"
and strings.icontains(.href_url.path, 'RedirectTarget.aspx')
and strings.icontains(.href_url.query_params, 'TargetUrl=')
)
) == 1
// 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 documentmailbox.com open redirect. This has been exploited in the wild.
- inbound message
any of
body.linkswhere all hold:- .href_url.domain.root_domain is 'documentmailbox.com'
- .href_url.path contains 'RedirectTarget.aspx'
- .href_url.query_params contains 'TargetUrl='
- length(filter(body.links, .href_url.domain.root_domain == 'documentmailbox.com' and strings.icontains(.href_url.path, 'RedirectTarget.aspx') and strings.icontains(.href_url.query_params, 'TargetUrl='))) is 1
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 | documentmailbox.com |
strings.icontains | substring | RedirectTarget.aspx |
strings.icontains | substring | TargetUrl= |