Brand impersonation: Microsoft logo in HTML with fake quarantine release notification

Severity: high
Type: rule
Source: github.com/sublime-security/sublime-rules

A message containing a Microsoft logo generated using HTML tables and references to the Microsoft Exchange quarantine, but did not come from Microsoft.

Threat classification

Sublime's own taxonomy (not MITRE ATT&CK).

Category	Values
Attack types	Credential Phishing
Tactics and techniques	Evasion, Impersonation: Brand, Social engineering

Event coverage

Message attribute
body
body.current_thread
body.html
headers (collection)
headers.hops (collection)
sender.email
type

Rule body MQL

type.inbound
and 0 < length(body.links) < 10
// Microsoft logo via HTML table composition
and (
  regex.icontains(body.html.raw,
                  '<table[^>]*>\s*<tbody[^>]*>\s*<tr[^>]*>\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\s*&nbsp;\s*</td>\s*){2}\s*</tr>\s*<tr[^>]*>\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\s*&nbsp;\s*</td>\s*){2}'
  )
  or regex.icontains(body.html.raw,
                     '<td style="background:\s*rgb\(246,\s*93,\s*53\);\s*height:\d+px;">.*?<td style="background:\s*rgb\(129,\s*187,\s*5\);\s*height:\d+px;">.*?<td style="background:\s*rgb\(4,\s*165,\s*240\);\s*height:\d+px;">.*?<td style="background:\s*rgb\(255,\s*186,\s*7\);\s*height:\d+px;">'
  )
  or 4 of (
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(245, 189, 67\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(137, 184, 57\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(217, 83, 51\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(71, 160, 218\);">.{0,10}</td>'
    )
  )
  or regex.icontains(body.html.raw,
                     '<DIV[^>]*><SPAN style="[^"]*BACKGROUND-COLOR: #ff1940"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #3eb55d"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #04b5f0"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #ffca07"></SPAN></DIV>'
  )
  or regex.icontains(body.html.raw,
                     '<span style="[^"]*background-color:\s*#FF1941;[^"]*"></span>\s*<span style="[^"]*background-color:\s*#36ba58;[^"]*"></span>\s*<span style="[^"]*background-color:\s*#04a1d6;[^"]*"></span>\s*<span style="[^"]*background-color:\s*#FFCA08;[^"]*"></span>'
  )
  or regex.icontains(body.html.raw,
                     '<td[^>]+background:#f25022[^>]+>.*?<td[^>]+background:#7fba00[^>]+>.*?<td[^>]+background:#01a4ef[^>]+>.*?<td[^>]+background:#ffb901[^>]+>'
  )
  or regex.icontains(body.html.raw,
                     '<td bgcolor="red".*?<td bgcolor="green".*?<td bgcolor="#04a5f0".*?<td bgcolor="#ffba07"'
  )
  or 4 of (
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(73, 161, 232\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(224, 92, 53\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(139, 183, 55\);">.{0,10}</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb\(244, 188, 65\);">.{0,10}</td>'
    )
  )
  or regex.icontains(body.html.raw,
                     '<td style="BACKGROUND-COLOR: red".*?<td style="BACKGROUND-COLOR: rgb\(19,186,132\)".*?<td style="BACKGROUND-COLOR: rgb\(4,166,240\)".*?<td style="BACKGROUND-COLOR: rgb\(255,186,8\)"'
  )
  or 4 of (
    regex.icontains(body.html.raw, 'background-color:rgb\(213,56,62\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(0,114,30\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(0,110,173\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(227,209,43\)'),
  )
  or 4 of (
    regex.icontains(body.html.raw, '<td[^>]*bgcolor="#F25022">&nbsp;</td>'),
    regex.icontains(body.html.raw, '<td[^>]*bgcolor="#7FBA00">&nbsp;</td>'),
    regex.icontains(body.html.raw,
                    '<td[^>]*(bgcolor="#00A4EF"|height="\d+")[^>]*(bgcolor="#00A4EF"|height="\d+")[^>]*>&nbsp;</td>'
    ),
    regex.icontains(body.html.raw,
                    '<td[^>]*(bgcolor="#FFB900"|height="\d+")[^>]*(bgcolor="#FFB900"|height="\d+")[^>]*>&nbsp;</td>'
    )
  )
  or regex.icontains(body.html.raw,
                     '<DIV[^>]*><SPAN[^>]*background-color:\s*#FF1940;[^>]*><\/SPAN><SPAN[^>]*background-color:\s*#36ba57;[^>]*><\/SPAN><SPAN[^>]*background-color:\s*#04a1d6;[^>]*><\/SPAN><SPAN[^>]*background-color:\s*#FFCA07;[^>]*><\/SPAN><\/DIV>'
  )
  or 3 of (
    regex.icontains(body.html.raw, '.password-expiration'),
    regex.icontains(body.html.raw, 'color: #2672ec;'),
    regex.icontains(body.html.raw, 'M\x{00AD}ic\x{00AD}ro\x{00AD}so\x{00AD}ft')
  )
  or 4 of (
    regex.icontains(body.html.raw, 'background-color:#FF1940;'),
    regex.icontains(body.html.raw, 'background-color:#3eb55d;'),
    regex.icontains(body.html.raw, 'background-color:#04B5F0;'),
    regex.icontains(body.html.raw, 'background-color:#FFCA07;'),
  )
  or 4 of (
    regex.icontains(body.html.raw, 'bgcolor="#eb5024"'),
    regex.icontains(body.html.raw, 'bgcolor="#7db606"'),
    regex.icontains(body.html.raw, 'bgcolor="#05a1e8"'),
    regex.icontains(body.html.raw, 'bgcolor="#f7b408"'),
  )
  or 4 of (
    regex.icontains(body.html.raw, '<td style="background: #E74F23;'),
    regex.icontains(body.html.raw, '<td style="background: #7AB206;'),
    regex.icontains(body.html.raw, '<td style="background: #059EE4;'),
    regex.icontains(body.html.raw, '<td style="background: #F2B108;'),
  )
  or 4 of (
    regex.icontains(body.html.raw, 'background-color:rgb\(246,93,53\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(129,187,5\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(4,165,240\)'),
    regex.icontains(body.html.raw, 'background-color:rgb\(255,186,7\)')
  )
  and 3 of (
    strings.icontains(body.current_thread.text, "review"),
    strings.icontains(body.current_thread.text, "release"),
    strings.icontains(body.current_thread.text, "quarantine"),
    strings.icontains(body.current_thread.text, "messages"),
    strings.icontains(body.current_thread.text, "recover"),
    strings.icontains(body.current_thread.text, "server error")
  )
  and sender.email.domain.root_domain not in (
    "bing.com",
    "microsoft.com",
    "microsoftonline.com",
    "microsoftsupport.com",
    "microsoft365.com",
    "office.com",
    "onedrive.com",
    "sharepointonline.com",
    "yammer.com",
  )
)

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and (
      any(distinct(headers.hops, .authentication_results.dmarc is not null),
          strings.ilike(.authentication_results.dmarc, "*fail")
      )
    )
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
and not profile.by_sender().solicited
and not profile.by_sender().any_messages_benign

Detection logic

Scope: inbound message.

A message containing a Microsoft logo generated using HTML tables and references to the Microsoft Exchange quarantine, but did not come from Microsoft.

inbound message
all of:
- length(body.links) > 0
- length(body.links) < 10
any of:
- body.html.raw matches '<table[^>]*>\\s*<tbody[^>]*>\\s*<tr[^>]*>\\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\\s* \\s*</td>\\s*){2}\\s*</tr>\\s*<tr[^>]*>\\s*(<td[^>]*bgcolor="#[0-9A-Fa-f]{6}"[^>]*>\\s* \\s*</td>\\s*){2}'
- body.html.raw matches '<td style="background:\\s*rgb\$246,\\s*93,\\s*53\$;\\s*height:\\d+px;">.*?<td style="background:\\s*rgb\$129,\\s*187,\\s*5\$;\\s*height:\\d+px;">.*?<td style="background:\\s*rgb\$4,\\s*165,\\s*240\$;\\s*height:\\d+px;">.*?<td style="background:\\s*rgb\$255,\\s*186,\\s*7\$;\\s*height:\\d+px;">'
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$245, 189, 67$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$137, 184, 57$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$217, 83, 51$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$71, 160, 218$;">.{0,10}</td>
- body.html.raw matches '<DIV[^>]*><SPAN style="[^"]*BACKGROUND-COLOR: #ff1940"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #3eb55d"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #04b5f0"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #ffca07"></SPAN></DIV>'
- body.html.raw matches '<span style="[^"]*background-color:\\s*#FF1941;[^"]*"></span>\\s*<span style="[^"]*background-color:\\s*#36ba58;[^"]*"></span>\\s*<span style="[^"]*background-color:\\s*#04a1d6;[^"]*"></span>\\s*<span style="[^"]*background-color:\\s*#FFCA08;[^"]*"></span>'
- body.html.raw matches '<td[^>]+background:#f25022[^>]+>.*?<td[^>]+background:#7fba00[^>]+>.*?<td[^>]+background:#01a4ef[^>]+>.*?<td[^>]+background:#ffb901[^>]+>'
- body.html.raw matches '<td bgcolor="red".*?<td bgcolor="green".*?<td bgcolor="#04a5f0".*?<td bgcolor="#ffba07"'
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$73, 161, 232$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$224, 92, 53$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$139, 183, 55$;">.{0,10}</td>
  - <td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$244, 188, 65$;">.{0,10}</td>
- body.html.raw matches '<td style="BACKGROUND-COLOR: red".*?<td style="BACKGROUND-COLOR: rgb\$19,186,132\$".*?<td style="BACKGROUND-COLOR: rgb\$4,166,240\$".*?<td style="BACKGROUND-COLOR: rgb\$255,186,8\$"'
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - background-color:rgb$213,56,62$
  - background-color:rgb$0,114,30$
  - background-color:rgb$0,110,173$
  - background-color:rgb$227,209,43$
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - <td[^>]*bgcolor="#F25022"> </td>
  - <td[^>]*bgcolor="#7FBA00"> </td>
  - <td[^>]*(bgcolor="#00A4EF"|height="\d+")[^>]*(bgcolor="#00A4EF"|height="\d+")[^>]*> </td>
  - <td[^>]*(bgcolor="#FFB900"|height="\d+")[^>]*(bgcolor="#FFB900"|height="\d+")[^>]*> </td>
- body.html.raw matches '<DIV[^>]*><SPAN[^>]*background-color:\\s*#FF1940;[^>]*><\\/SPAN><SPAN[^>]*background-color:\\s*#36ba57;[^>]*><\\/SPAN><SPAN[^>]*background-color:\\s*#04a1d6;[^>]*><\\/SPAN><SPAN[^>]*background-color:\\s*#FFCA07;[^>]*><\\/SPAN><\\/DIV>'
- at least 3 of:
  - body.html.raw matches '.password-expiration'
  - body.html.raw matches 'color: #2672ec;'
  - body.html.raw matches 'M\\x{00AD}ic\\x{00AD}ro\\x{00AD}so\\x{00AD}ft'
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - background-color:#FF1940;
  - background-color:#3eb55d;
  - background-color:#04B5F0;
  - background-color:#FFCA07;
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - bgcolor="#eb5024"
  - bgcolor="#7db606"
  - bgcolor="#05a1e8"
  - bgcolor="#f7b408"
- at least 4 of 4: body.html.raw matches any of 4 patterns
  - <td style="background: #E74F23;
  - <td style="background: #7AB206;
  - <td style="background: #059EE4;
  - <td style="background: #F2B108;
- all of:
  - at least 4 of 4: body.html.raw matches any of 4 patterns
    
    background-color:rgb$246,93,53$
    background-color:rgb$129,187,5$
    background-color:rgb$4,165,240$
    background-color:rgb$255,186,7$
  - at least 3 of 6: body.current_thread.text contains any of 6 patterns
    
    review
    release
    quarantine
    messages
    recover
    server error
  - sender.email.domain.root_domain not in ('bing.com', 'microsoft.com', 'microsoftonline.com', 'microsoftsupport.com', 'microsoft365.com', 'office.com', 'onedrive.com', 'sharepointonline.com', 'yammer.com')
any of:
- all of:
  - sender.email.domain.root_domain in $high_trust_sender_root_domains
  - any of distinct(headers.hops) where:
    
    .authentication_results.dmarc matches '*fail'
- sender.email.domain.root_domain not in $high_trust_sender_root_domains
not:
- profile.by_sender().solicited
not:
- profile.by_sender().any_messages_benign

Inspects: body.current_thread.text, body.html.raw, body.links, headers.hops, headers.hops[].authentication_results.dmarc, sender.email.domain.root_domain, type.inbound. Sensors: profile.by_sender, regex.icontains, strings.icontains, strings.ilike. Reference lists: $high_trust_sender_root_domains.

Indicators matched (59)

Field	Match	Value
`regex.icontains`	regex	`<table[^>]>\s<tbody[^>]>\s<tr[^>]>\s(<td[^>]bgcolor="#[0-9A-Fa-f]{6}"[^>]>\s* \s</td>\s){2}\s</tr>\s<tr[^>]>\s(<td[^>]bgcolor="#[0-9A-Fa-f]{6}"[^>]>\s* \s</td>\s){2}`
`regex.icontains`	regex	`<td style="background:\srgb$246,\s93,\s53$;\sheight:\d+px;">.?<td style="background:\srgb$129,\s187,\s5$;\sheight:\d+px;">.?<td style="background:\srgb$4,\s165,\s240$;\sheight:\d+px;">.?<td style="background:\srgb$255,\s186,\s7$;\s*height:\d+px;">`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$245, 189, 67$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$137, 184, 57$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$217, 83, 51$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$71, 160, 218$;">.{0,10}</td>`
`regex.icontains`	regex	`<DIV[^>]><SPAN style="[^"]BACKGROUND-COLOR: #ff1940"></SPAN><SPAN style="[^"]BACKGROUND-COLOR: #3eb55d"></SPAN><SPAN style="[^"]BACKGROUND-COLOR: #04b5f0"></SPAN><SPAN style="[^"]*BACKGROUND-COLOR: #ffca07"></SPAN></DIV>`
`regex.icontains`	regex	`<span style="[^"]background-color:\s#FF1941;[^"]"></span>\s<span style="[^"]background-color:\s#36ba58;[^"]"></span>\s<span style="[^"]background-color:\s#04a1d6;[^"]"></span>\s<span style="[^"]background-color:\s#FFCA08;[^"]*"></span>`
`regex.icontains`	regex	`<td[^>]+background:#f25022[^>]+>.?<td[^>]+background:#7fba00[^>]+>.?<td[^>]+background:#01a4ef[^>]+>.*?<td[^>]+background:#ffb901[^>]+>`
`regex.icontains`	regex	`<td bgcolor="red".?<td bgcolor="green".?<td bgcolor="#04a5f0".*?<td bgcolor="#ffba07"`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$73, 161, 232$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$224, 92, 53$;">.{0,10}</td>`

47 more

`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$139, 183, 55$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="width:.\d.px;.height:.\d.px;.background-color:.rgb$244, 188, 65$;">.{0,10}</td>`
`regex.icontains`	regex	`<td style="BACKGROUND-COLOR: red".?<td style="BACKGROUND-COLOR: rgb$19,186,132$".?<td style="BACKGROUND-COLOR: rgb$4,166,240$".*?<td style="BACKGROUND-COLOR: rgb$255,186,8$"`
`regex.icontains`	regex	`background-color:rgb$213,56,62$`
`regex.icontains`	regex	`background-color:rgb$0,114,30$`
`regex.icontains`	regex	`background-color:rgb$0,110,173$`
`regex.icontains`	regex	`background-color:rgb$227,209,43$`
`regex.icontains`	regex	`<td[^>]*bgcolor="#F25022"> </td>`
`regex.icontains`	regex	`<td[^>]*bgcolor="#7FBA00"> </td>`
`regex.icontains`	regex	`<td[^>](bgcolor="#00A4EF"\|height="\d+")[^>](bgcolor="#00A4EF"\|height="\d+")[^>]*> </td>`
`regex.icontains`	regex	`<td[^>](bgcolor="#FFB900"\|height="\d+")[^>](bgcolor="#FFB900"\|height="\d+")[^>]*> </td>`
`regex.icontains`	regex	`<DIV[^>]><SPAN[^>]background-color:\s#FF1940;[^>]><\/SPAN><SPAN[^>]background-color:\s#36ba57;[^>]><\/SPAN><SPAN[^>]background-color:\s#04a1d6;[^>]><\/SPAN><SPAN[^>]background-color:\s#FFCA07;[^>]*><\/SPAN><\/DIV>`
`regex.icontains`	regex	`.password-expiration`
`regex.icontains`	regex	`color: #2672ec;`
`regex.icontains`	regex	`M\x{00AD}ic\x{00AD}ro\x{00AD}so\x{00AD}ft`
`regex.icontains`	regex	`background-color:#FF1940;`
`regex.icontains`	regex	`background-color:#3eb55d;`
`regex.icontains`	regex	`background-color:#04B5F0;`
`regex.icontains`	regex	`background-color:#FFCA07;`
`regex.icontains`	regex	`bgcolor="#eb5024"`
`regex.icontains`	regex	`bgcolor="#7db606"`
`regex.icontains`	regex	`bgcolor="#05a1e8"`
`regex.icontains`	regex	`bgcolor="#f7b408"`
`regex.icontains`	regex	`<td style="background: #E74F23;`
`regex.icontains`	regex	`<td style="background: #7AB206;`
`regex.icontains`	regex	`<td style="background: #059EE4;`
`regex.icontains`	regex	`<td style="background: #F2B108;`
`regex.icontains`	regex	`background-color:rgb$246,93,53$`
`regex.icontains`	regex	`background-color:rgb$129,187,5$`
`regex.icontains`	regex	`background-color:rgb$4,165,240$`
`regex.icontains`	regex	`background-color:rgb$255,186,7$`
`strings.icontains`	substring	`review`
`strings.icontains`	substring	`release`
`strings.icontains`	substring	`quarantine`
`strings.icontains`	substring	`messages`
`strings.icontains`	substring	`recover`
`strings.icontains`	substring	`server error`
`sender.email.domain.root_domain`	member	`bing.com`
`sender.email.domain.root_domain`	member	`microsoft.com`
`sender.email.domain.root_domain`	member	`microsoftonline.com`
`sender.email.domain.root_domain`	member	`microsoftsupport.com`
`sender.email.domain.root_domain`	member	`microsoft365.com`
`sender.email.domain.root_domain`	member	`office.com`
`sender.email.domain.root_domain`	member	`onedrive.com`
`sender.email.domain.root_domain`	member	`sharepointonline.com`
`sender.email.domain.root_domain`	member	`yammer.com`
`strings.ilike`	substring	`*fail`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)