Detection rules › Sublime MQL
Service abuse: Monday.com infrastructure with phishing intent
Detects unauthorized use of Monday.com tracking links in messages, attachments, or QR codes from unusual senders who lack proper authentication. Excludes legitimate replies and messages from trusted domains with valid DMARC.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing |
| Tactics and techniques | Evasion, Social engineering, QR code |
Event coverage
Rule body MQL
type.inbound
and (
(
length(body.links) < 15
and any(body.links,
'monday_tracker' in .href_url.rewrite.encoders
and .href_url.scheme != "mailto"
)
)
or (
length(attachments) <= 3
and (
any(attachments,
(.file_type in $file_types_images or .file_type == "pdf")
//
// This rule makes use of a beta feature and is subject to change without notice
// using the beta feature in custom rules is not suggested until it has been formally released
//
and any(beta.scan_qr(.).items,
.type is not null
and 'monday_tracker' in .url.rewrite.encoders
and .url.scheme != "mailto"
)
//
// This rule makes use of a beta feature and is subject to change without notice
// using the beta feature in custom rules is not suggested until it has been formally released
//
// exclude images taken with mobile cameras and screenshots from android
and not any(beta.parse_exif(.).fields,
.key == "Model"
or (
.key == "Software"
and strings.starts_with(.value, "Android")
)
)
// exclude images taken with mobile cameras and screenshots from Apple
and not any(beta.parse_exif(.).fields,
.key == "DeviceManufacturer"
and .value == "Apple Computer Inc."
)
)
)
)
or (
length(attachments) == 0
and (
//
// This rule makes use of a beta feature and is subject to change without notice
// using the beta feature in custom rules is not suggested until it has been formally released
//
beta.parse_exif(file.message_screenshot()).image_height < 2000
and beta.parse_exif(file.message_screenshot()).image_width < 2000
and beta.scan_qr(file.message_screenshot()).found
and any(beta.scan_qr(file.message_screenshot()).items,
.type is not null
and 'monday_tracker' in .url.rewrite.encoders
and .url.scheme != "mailto"
)
)
)
or (
length(attachments) <= 3
and (
any(attachments,
(
.file_type in ("pdf")
or .file_extension in ("pdf", "eml")
or .file_extension in $file_extensions_macros
or .content_type in ("message/rfc822")
)
and any(file.explode(.),
any(.scan.url.urls, 'monday_tracker' in .rewrite.encoders)
)
)
)
)
)
// negate messages that traverse monday.com infra
and not (
any(headers.domains, strings.ends_with(.domain, "mail.monday.com"))
or (
strings.iends_with(headers.message_id, '@monday-mail.com>')
and any(headers.hops,
any(.fields,
.name =~ "Content-Type"
and strings.iends_with(.value, 'mondaymailcom_"')
)
)
and any(headers.hops, any(.fields, .name =~ "x-monday-crm"))
)
)
and not (
headers.auth_summary.dmarc.details.from.root_domain == "monday.com"
and headers.auth_summary.spf.pass
and headers.auth_summary.dmarc.pass
)
and any(ml.nlu_classifier(body.current_thread.text).intents,
.name != "benign" and .confidence in ("medium", "high")
)
// negating legit replies
and not (
(subject.is_reply or subject.is_forward)
and (length(headers.references) > 0 and headers.in_reply_to is not null)
)
// negate graymail and newsletters
and not (
any(ml.nlu_classifier(body.current_thread.text).topics,
.name in~ (
"Advertising and Promotions",
"B2B Cold Outreach",
"Newsletters and Digests",
"Events and Webinars"
)
and .confidence != "low"
)
)
and (
// negate highly trusted sender domains unless they fail DMARC authentication
not (
sender.email.domain.root_domain in $high_trust_sender_root_domains
and coalesce(headers.auth_summary.dmarc.pass, false)
)
// salesforce has been abused to send phishing campaigns leveraging monday.com infrastructure abuse
or sender.email.domain.root_domain in ("salesforce.com")
)
Detection logic
Scope: inbound message.
Detects unauthorized use of Monday.com tracking links in messages, attachments, or QR codes from unusual senders who lack proper authentication. Excludes legitimate replies and messages from trusted domains with valid DMARC.
- inbound message
any of:
all of:
- length(body.links) < 15
any of
body.linkswhere all hold:- .href_url.rewrite.encoders contains 'monday_tracker'
- .href_url.scheme is not 'mailto'
all of:
- length(attachments) ≤ 3
any of
attachmentswhere all hold:any of:
- .file_type in $file_types_images
- .file_type is 'pdf'
any of
beta.scan_qr(.).itemswhere all hold:- .type is set
- .url.rewrite.encoders contains 'monday_tracker'
- .url.scheme is not 'mailto'
not:
any of
beta.parse_exif(.).fieldswhere any holds:- .key is 'Model'
all of:
- .key is 'Software'
- .value starts with 'Android'
not:
any of
beta.parse_exif(.).fieldswhere all hold:- .key is 'DeviceManufacturer'
- .value is 'Apple Computer Inc.'
all of:
- length(attachments) is 0
all of:
- beta.parse_exif(file.message_screenshot()).image_height < 2000
- beta.parse_exif(file.message_screenshot()).image_width < 2000
- beta.scan_qr(file.message_screenshot()).found
any of
beta.scan_qr(file.message_screenshot()).itemswhere all hold:- .type is set
- .url.rewrite.encoders contains 'monday_tracker'
- .url.scheme is not 'mailto'
all of:
- length(attachments) ≤ 3
any of
attachmentswhere all hold:any of:
- .file_type in ('pdf')
- .file_extension in ('pdf', 'eml')
- .file_extension in $file_extensions_macros
- .content_type in ('message/rfc822')
any of
file.explode(.)where:any of
.scan.url.urlswhere:- .rewrite.encoders contains 'monday_tracker'
none of:
any of
headers.domainswhere:- .domain ends with 'mail.monday.com'
all of:
- headers.message_id ends with '@monday-mail.com>'
any of
headers.hopswhere:any of
.fieldswhere all hold:- .name is 'Content-Type'
- .value ends with 'mondaymailcom_"'
any of
headers.hopswhere:any of
.fieldswhere:- .name is 'x-monday-crm'
not:
all of:
- headers.auth_summary.dmarc.details.from.root_domain is 'monday.com'
- headers.auth_summary.spf.pass
- headers.auth_summary.dmarc.pass
any of
ml.nlu_classifier(body.current_thread.text).intentswhere all hold:- .name is not 'benign'
- .confidence in ('medium', 'high')
not:
all of:
any of:
- subject.is_reply
- subject.is_forward
all of:
- length(headers.references) > 0
- headers.in_reply_to is set
not:
any of
ml.nlu_classifier(body.current_thread.text).topicswhere all hold:- .name in ('Advertising and Promotions', 'B2B Cold Outreach', 'Newsletters and Digests', 'Events and Webinars')
- .confidence is not 'low'
any of:
not:
all of:
- sender.email.domain.root_domain in $high_trust_sender_root_domains
- coalesce(headers.auth_summary.dmarc.pass)
- sender.email.domain.root_domain in ('salesforce.com')
Inspects: attachments[].content_type, attachments[].file_extension, attachments[].file_type, body.current_thread.text, body.links, body.links[].href_url.rewrite.encoders, body.links[].href_url.scheme, headers.auth_summary.dmarc.details.from.root_domain, headers.auth_summary.dmarc.pass, headers.auth_summary.spf.pass, headers.domains, headers.domains[].domain, headers.hops, headers.hops[].fields, headers.hops[].fields[].name, headers.hops[].fields[].value, headers.in_reply_to, headers.message_id, headers.references, sender.email.domain.root_domain, subject.is_forward, subject.is_reply, type.inbound. Sensors: beta.parse_exif, beta.scan_qr, file.explode, file.message_screenshot, ml.nlu_classifier, strings.ends_with, strings.iends_with, strings.starts_with. Reference lists: $file_extensions_macros, $file_types_images, $high_trust_sender_root_domains.
Indicators matched (27)
| Field | Match | Value |
|---|---|---|
body.links[].href_url.rewrite.encoders | contains | monday_tracker |
attachments[].file_type | equals | pdf |
beta.scan_qr(attachments[]).items[].url.rewrite.encoders | contains | monday_tracker |
beta.parse_exif(attachments[]).fields[].key | equals | Model |
beta.parse_exif(attachments[]).fields[].key | equals | Software |
strings.starts_with | prefix | Android |
beta.parse_exif(attachments[]).fields[].key | equals | DeviceManufacturer |
beta.parse_exif(attachments[]).fields[].value | equals | Apple Computer Inc. |
beta.scan_qr(file.message_screenshot()).items[].url.rewrite.encoders | contains | monday_tracker |
attachments[].file_type | member | pdf |
attachments[].file_extension | member | pdf |
attachments[].file_extension | member | eml |
15 more
attachments[].content_type | member | message/rfc822 |
file.explode(attachments[])[].scan.url.urls[].rewrite.encoders | contains | monday_tracker |
strings.ends_with | suffix | mail.monday.com |
strings.iends_with | suffix | @monday-mail.com> |
headers.hops[].fields[].name | equals | Content-Type |
strings.iends_with | suffix | mondaymailcom_" |
headers.hops[].fields[].name | equals | x-monday-crm |
headers.auth_summary.dmarc.details.from.root_domain | equals | monday.com |
ml.nlu_classifier(body.current_thread.text).intents[].confidence | member | medium |
ml.nlu_classifier(body.current_thread.text).intents[].confidence | member | high |
ml.nlu_classifier(body.current_thread.text).topics[].name | member | Advertising and Promotions |
ml.nlu_classifier(body.current_thread.text).topics[].name | member | B2B Cold Outreach |
ml.nlu_classifier(body.current_thread.text).topics[].name | member | Newsletters and Digests |
ml.nlu_classifier(body.current_thread.text).topics[].name | member | Events and Webinars |
sender.email.domain.root_domain | member | salesforce.com |