AWSCloudTrail - Successful API executed from a Tor exit node

Status: available
Severity: high
Time window: 1d
Source: github.com/Azure/Azure-Sentinel

Identifies successful AWS CloudTrail API activity originating from an IP address identified as a TOR exit node in the external TOR list hosted at https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip. The rule alerts only when CloudTrail indicates the request completed successfully with no ErrorCode and no ErrorMessage, and the source IP is present in the TOR exit node list.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1204` User Execution

Rule body kusto

id: 0adab960-5565-4978-ba6d-044553e4acc4
name: AWSCloudTrail - Successful API executed from a Tor exit node
description: |
  Identifies successful AWS CloudTrail API activity originating from an IP address identified as a TOR exit node in
  the external TOR list hosted at https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip. The rule alerts
  only when CloudTrail indicates the request completed successfully with no ErrorCode and no ErrorMessage, and the source
  IP is present in the TOR exit node list.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: AWS
    dataTypes:
      - AWSCloudTrail
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Execution
relevantTechniques:
  - T1204
query: |
    let TorNodes = (
    externaldata (TorIP:string)
    [h@'https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip']
    with (ignoreFirstRecord=true));
    AWSCloudTrail
    | where SourceIpAddress in (TorNodes) and isempty(ErrorCode) and isempty(ErrorMessage)
    | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
    | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
    | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
    | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
        AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
    | project TimeGenerated, SourceIpAddress, AccountName, AccountUPNSuffix, UserIdentityArn, UserIdentityUserName, UserIdentityPrincipalid, EventName, EventSource, AWSRegion, RecipientAccountId
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: AccountUPNSuffix
      - identifier: CloudAppAccountId
        columnName: RecipientAccountId
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SourceIpAddress
customDetails:
  UserIdentityArn: UserIdentityArn
  EventName: EventName
  EventSource: EventSource
  AWSRegion: AWSRegion
alertDetailsOverride:
  alertDisplayNameFormat: 'Successful AWS API call from TOR exit node: {{AccountName}} from {{SourceIpAddress}}'
  alertDescriptionFormat: 'A successful AWS API call was observed from TOR exit node IP {{SourceIpAddress}} for account {{AccountName}}.'
version: 1.0.2
kind: Scheduled

Stages and Predicates

Let binding: `TorNodes`

let TorNodes = (
externaldata (TorIP:string)
[h@'https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip']
with (ignoreFirstRecord=true));

Stage 1: `source`

AWSCloudTrail

Stage 2: `where`

| where SourceIpAddress in (TorNodes) and isempty(ErrorCode) and isempty(ErrorMessage)

References TorNodes (defined above).

Stage 3: `extend` (4 consecutive steps)

| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")

Stage 4: `project`

| project TimeGenerated, SourceIpAddress, AccountName, AccountUPNSuffix, UserIdentityArn, UserIdentityUserName, UserIdentityPrincipalid, EventName, EventSource, AWSRegion, RecipientAccountId

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
`ErrorCode`	is_null	(no value, null check)
`ErrorMessage`	is_null	(no value, null check)
`SourceIpAddress`	in	`TorNodes` 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
`AWSRegion`	`project`
`AccountName`	`project`
`AccountUPNSuffix`	`project`
`EventName`	`project`
`EventSource`	`project`
`RecipientAccountId`	`project`
`SourceIpAddress`	`project`
`TimeGenerated`	`project`
`UserIdentityArn`	`project`
`UserIdentityPrincipalid`	`project`
`UserIdentityUserName`	`project`

`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)

AWSCloudTrail - Successful API executed from a Tor exit node

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: `TorNodes`

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend` (4 consecutive steps)

Stage 4: `project`

Indicators

Output fields

Keyboard shortcuts

Search operators

AWSCloudTrail - Successful API executed from a Tor exit node

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: TorNodes

Stage 1: source

Stage 2: where

Stage 3: extend (4 consecutive steps)

Stage 4: project

Indicators

Output fields

Let binding: `TorNodes`

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend` (4 consecutive steps)

Stage 4: `project`