Several deny actions registered

Status: available
Severity: medium
Time window: 1h
Group by: Action, Fqdn, Protocol, SourceIp
Source: github.com/Azure/Azure-Sentinel

'Identifies attack pattern when attacker tries to move, or scan, from resource to resource on the network and creates an incident when a source has more than 1 registered deny action in Azure Firewall.'

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1046` Network Service Discovery
Lateral Movement	`T1210` Exploitation of Remote Services
Command & Control	`T1071` Application Layer Protocol

Rule body kusto

id: f8dad4e9-3f19-4d70-ab7f-8f19ccd43a3e
name: Several deny actions registered
description: |
  'Identifies attack pattern when attacker tries to move, or scan, from resource to resource on the network and creates an incident when a source has more than 1 registered deny action in Azure Firewall.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: AzureFirewall
    dataTypes:
      - AzureDiagnostics
      - AZFWApplicationRule
      - AZFWNetworkRule
      - AZFWFlowTrace
      - AZFWIdpsSignature
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Discovery
  - LateralMovement
  - CommandAndControl
relevantTechniques:
  - T1046
  - T1071
  - T1210
query: |
  let threshold = 1;
  union isfuzzy=true(
  AZFWApplicationRule
  | where Action == "Deny"
  | summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
  | where count_ >= ["threshold"]),
  (AZFWNetworkRule
  | where Action == "Deny"
  | extend Fqdn = DestinationIp
  | summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
  | where count_ >= ["threshold"]),
  (AZFWFlowTrace
  | where Action == "Deny"
  | extend Fqdn = DestinationIp
  | summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
  | where count_ >= ["threshold"]),
  (AZFWIdpsSignature
  | where Action == "Deny"
  | extend Fqdn = DestinationIp
  | summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
  | where count_ >= ["threshold"]),
  (AzureDiagnostics
  | where OperationName in ("AzureFirewallApplicationRuleLog","AzureFirewallNetworkRuleLog")
  | extend msg_s_replaced0 = replace(@"\s\s",@" ",msg_s)
  | extend msg_s_replaced1 = replace(@"\.\s",@" ",msg_s_replaced0)
  | extend msg_a = split(msg_s_replaced1," ")
  | extend srcAddr_a = split(msg_a[3],":") , destAddr_a = split(msg_a[5],":")
  | extend Protocol = tostring(msg_a[0]), SourceIp = tostring(srcAddr_a[0]), srcPort = tostring(srcAddr_a[1]), DestinationIp = tostring(destAddr_a[0]), destPort = tostring(destAddr_a[1]), Action = tostring(msg_a[7])
  | where Action == "Deny"
  | extend Fqdn = iff(DestinationIp matches regex "\\d+\\.\\d+\\.\\d+\\.\\d+","",DestinationIp)
  | summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
  | where count_ >= ["threshold"])
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SourceIp
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Fqdn
customDetails:
  NetworkProtocol: Protocol
alertDetailsOverride:
  alertDisplayNameFormat: 'Multiple Deny Actions Detected from {{SourceIp}} to {{Fqdn}}'
  alertDescriptionFormat: 'Source IP {{SourceIp}} has triggered multiple deny actions to destination {{Fqdn}} using protocol {{Protocol}}, which may indicate malicious activity such as lateral movement or reconnaissance.'
version: 1.1.2
kind: Scheduled

Stages and Predicates

Parameters

let threshold = 1;

union `isfuzzy=true` (5 sources)

Each leg below queries one source; the rule matches if any leg does. Sources: AZFWApplicationRule, AZFWNetworkRule, AZFWFlowTrace, AZFWIdpsSignature, AzureDiagnostics

Leg 1: `AZFWApplicationRule`

AZFWApplicationRule
| where Action == "Deny"
| summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
| where count_ >= ["threshold"]

Leg 2: `AZFWNetworkRule`

AZFWNetworkRule
| where Action == "Deny"
| extend Fqdn = DestinationIp
| summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
| where count_ >= ["threshold"]

Leg 3: `AZFWFlowTrace`

AZFWFlowTrace
| where Action == "Deny"
| extend Fqdn = DestinationIp
| summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
| where count_ >= ["threshold"]

Leg 4: `AZFWIdpsSignature`

AZFWIdpsSignature
| where Action == "Deny"
| extend Fqdn = DestinationIp
| summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
| where count_ >= ["threshold"]

Leg 5: `AzureDiagnostics`

AzureDiagnostics
| where OperationName in ("AzureFirewallApplicationRuleLog","AzureFirewallNetworkRuleLog")
| extend msg_s_replaced0 = replace(@"\s\s",@" ",msg_s)
| extend msg_s_replaced1 = replace(@"\.\s",@" ",msg_s_replaced0)
| extend msg_a = split(msg_s_replaced1," ")
| extend srcAddr_a = split(msg_a[3],":") , destAddr_a = split(msg_a[5],":")
| extend Protocol = tostring(msg_a[0]), SourceIp = tostring(srcAddr_a[0]), srcPort = tostring(srcAddr_a[1]), DestinationIp = tostring(destAddr_a[0]), destPort = tostring(destAddr_a[1]), Action = tostring(msg_a[7])
| where Action == "Deny"
| extend Fqdn = iff(DestinationIp matches regex "\\d+\\.\\d+\\.\\d+\\.\\d+","",DestinationIp)
| summarize StartTime = min(TimeGenerated), count() by SourceIp, Fqdn, Action, Protocol
| where count_ >= ["threshold"]

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
`Action`	eq	`Deny` transforms: `cased`
`OperationName`	in	`AzureFirewallApplicationRuleLog` transforms: `cased` `AzureFirewallNetworkRuleLog` transforms: `cased`

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
`Action`	`summarize`
`Fqdn`	`summarize`
`Protocol`	`summarize`
`SourceIp`	`summarize`
`StartTime`	`summarize`

`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)

Several deny actions registered

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

union `isfuzzy=true` (5 sources)

Leg 1: `AZFWApplicationRule`

Leg 2: `AZFWNetworkRule`

Leg 3: `AZFWFlowTrace`

Leg 4: `AZFWIdpsSignature`

Leg 5: `AzureDiagnostics`

Indicators

Output fields

Keyboard shortcuts

Search operators

Several deny actions registered

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

union isfuzzy=true (5 sources)

Leg 1: AZFWApplicationRule

Leg 2: AZFWNetworkRule

Leg 3: AZFWFlowTrace

Leg 4: AZFWIdpsSignature

Leg 5: AzureDiagnostics

Indicators

Output fields

union `isfuzzy=true` (5 sources)

Leg 1: `AZFWApplicationRule`

Leg 2: `AZFWNetworkRule`

Leg 3: `AZFWFlowTrace`

Leg 4: `AZFWIdpsSignature`

Leg 5: `AzureDiagnostics`