OCI - Multiple rejects on rare ports

Status: available
Severity: medium
Time window: 5m
Group by: SrcIpAddr
Source: github.com/Azure/Azure-Sentinel

'Detects multiple rejects on rare ports.'

MITRE ATT&CK coverage

Tactic	Techniques
Reconnaissance	`T1595` Active Scanning

Rule body kusto

id: 482c24b9-a700-4b2a-85d3-1c42110ba78c
name: OCI - Multiple rejects on rare ports
description: |
  'Detects multiple rejects on rare ports.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: OracleCloudInfrastructureLogsConnector
    dataTypes:
      - OCILogs
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Reconnaissance
relevantTechniques:
  - T1595
query: |
  let threshold = 50;
  let r_dports = 
  OCILogs
  | where EventType contains 'vcn.flowlogs'
  | where ipv4_is_private(DstIpAddr)
  | where ipv4_is_private(SrcIpAddr) == False
  | summarize count() by DstPortNumber
  | top 10 by count_ asc
  | summarize dports = makeset(DstPortNumber)
  | extend k = 1;
  OCILogs
  | where EventType contains 'vcn.flowlogs'
  | where data_action_s =~ 'REJECT'
  | where ipv4_is_private(DstIpAddr)
  | where ipv4_is_private(SrcIpAddr) == False
  | extend k = 1
  | join kind=innerunique (r_dports) on k
  | where dports has tostring(DstPortNumber)
  | summarize count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where count_ > threshold
  | extend IPCustomEntity = SrcIpAddr
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Parameters

let threshold = 50;

Let binding: `r_dports`

let r_dports = OCILogs
| where EventType contains 'vcn.flowlogs'
| where ipv4_is_private(DstIpAddr)
| where ipv4_is_private(SrcIpAddr) == False
| summarize count() by DstPortNumber
| top 10 by count_ asc
| summarize dports = makeset(DstPortNumber)
| extend k = 1;

Stage 1: `source`

OCILogs

Stage 2: `where`

| where EventType contains 'vcn.flowlogs'

Stage 3: `where`

| where data_action_s =~ 'REJECT'

Stage 4: `where`

| where ipv4_is_private(DstIpAddr)

Stage 5: `where`

| where ipv4_is_private(SrcIpAddr) == False

Stage 6: `extend`

| extend k = 1

Stage 7: `join`

| join kind=innerunique (r_dports) on k

Stage 8: `where`

| where dports has tostring(DstPortNumber)

Stage 9: `summarize`

| summarize count() by SrcIpAddr, bin(TimeGenerated, 5m)

Stage 10: `where`

| where count_ > threshold

Stage 11: `extend`

| extend IPCustomEntity = SrcIpAddr

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`SrcIpAddr`	cidr_match	`10.0.0.0/8`, `172.16.0.0/12`, `192.168.0.0/16`, `169.254.0.0/16`, `127.0.0.0/8`
`SrcIpAddr`	cidr_match	`10.0.0.0/8`, `172.16.0.0/12`, `192.168.0.0/16`, `169.254.0.0/16`, `127.0.0.0/8`

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`DstIpAddr`	cidr_match	`10.0.0.0/8` `127.0.0.0/8` `169.254.0.0/16` `172.16.0.0/12` `192.168.0.0/16`
`EventType`	contains	`vcn.flowlogs`
`count_`	gt	`50` transforms: `cased`
`data_action_s`	eq	`REJECT`
`dports`	match	`DstPortNumber` transforms: `term`

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`SrcIpAddr`	`summarize`
`IPCustomEntity`	`extend`

`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)

OCI - Multiple rejects on rare ports

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Let binding: `r_dports`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `where`

Stage 6: `extend`

Stage 7: `join`

Stage 8: `where`

Stage 9: `summarize`

Stage 10: `where`

Stage 11: `extend`

Exclusions

Indicators

Output fields

Keyboard shortcuts

Search operators

OCI - Multiple rejects on rare ports

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Let binding: r_dports

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: where

Stage 6: extend

Stage 7: join

Stage 8: where

Stage 9: summarize

Stage 10: where

Stage 11: extend

Exclusions

Indicators

Output fields

Let binding: `r_dports`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `where`

Stage 6: `extend`

Stage 7: `join`

Stage 8: `where`

Stage 9: `summarize`

Stage 10: `where`

Stage 11: `extend`