Cisco Cloud Security - Hack Tool User-Agent Detected

Status: available
Severity: medium
Time window: 15m
Source: github.com/Azure/Azure-Sentinel

'Detects suspicious user agent strings used by known hack tools'

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter
Discovery	`T1046` Network Service Discovery
Lateral Movement	`T1021` Remote Services
Collection	`T1557` Adversary-in-the-Middle
Command & Control	`T1102` Web Service
Exfiltration	`T1020` Automated Exfiltration

Rule body kusto

id: 8d537f3c-094f-430c-a588-8a87da36ee3a
name: Cisco Cloud Security - Hack Tool User-Agent Detected
description: |
  'Detects suspicious user agent strings used by known hack tools'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: CiscoUmbrellaDataConnector
    dataTypes:
      - Cisco_Umbrella_proxy_CL
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Execution
  - Discovery
  - LateralMovement
  - Collection
  - CommandAndControl
  - Exfiltration
relevantTechniques:
  - T1059
  - T1046
  - T1021
  - T1557
  - T1102
  - T1020
query: |
  let user_agents=dynamic([
                            '(hydra)',
                            ' arachni/',
                            ' BFAC ',
                            ' brutus ',
                            ' cgichk ',
                            'core-project/1.0',
                            ' crimscanner/',
                            'datacha0s',
                            'dirbuster',
                            'domino hunter',
                            'dotdotpwn',
                            'FHScan Core',
                            'floodgate',
                            'get-minimal',
                            'gootkit auto-rooter scanner',
                            'grendel-scan',
                            ' inspath ',
                            'internet ninja',
                            'jaascois',
                            ' zmeu ',
                            'masscan',
                            ' metis ',
                            'morfeus fucking scanner',
                            'n-stealth',
                            'nsauditor',
                            'pmafind',
                            'security scan',
                            'springenwerk',
                            'teh forest lobster',
                            'toata dragostea',
                            ' vega/',
                            'voideye',
                            'webshag',
                            'webvulnscan',
                            ' whcc/',
                            ' Havij',
                            'absinthe',
                            'bsqlbf',
                            'mysqloit',
                            'pangolin',
                            'sql power injector',
                            'sqlmap',
                            'sqlninja',
                            'uil2pn',
                            'ruler',
                            'Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-PT; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)'
                            ]);
  Cisco_Umbrella
  | where EventType == "proxylogs"
  | where HttpUserAgentOriginal has_any (user_agents)
  | extend Message = "Hack Tool User Agent"
  | project TimeGenerated, Message, SrcIpAddr, DstIpAddr, UrlOriginal, HttpUserAgentOriginal
entityMappings:
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: UrlOriginal
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SrcIpAddr
version: 1.1.3
kind: Scheduled

Stages and Predicates

Let binding: `user_agents`

let user_agents = dynamic([
                          '(hydra)',
                          ' arachni/',
                          ' BFAC ',
                          ' brutus ',
                          ' cgichk ',
                          'core-project/1.0',
                          ' crimscanner/',
                          'datacha0s',
                          'dirbuster',
                          'domino hunter',
                          'dotdotpwn',
                          'FHScan Core',
                          'floodgate',
                          'get-minimal',
                          'gootkit auto-rooter scanner',
                          'grendel-scan',
                          ' inspath ',
                          'internet ninja',
                          'jaascois',
                          ' zmeu ',
                          'masscan',
                          ' metis ',
                          'morfeus fucking scanner',
                          'n-stealth',
                          'nsauditor',
                          'pmafind',
                          'security scan',
                          'springenwerk',
                          'teh forest lobster',
                          'toata dragostea',
                          ' vega/',
                          'voideye',
                          'webshag',
                          'webvulnscan',
                          ' whcc/',
                          ' Havij',
                          'absinthe',
                          'bsqlbf',
                          'mysqloit',
                          'pangolin',
                          'sql power injector',
                          'sqlmap',
                          'sqlninja',
                          'uil2pn',
                          'ruler',
                          'Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-PT; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)'
                          ]);

Stage 1: `source`

Cisco_Umbrella

Stage 2: `where`

| where EventType == "proxylogs"

Stage 3: `where`

| where HttpUserAgentOriginal has_any (user_agents)

References user_agents (defined above).

Stage 4: `extend`

| extend Message = "Hack Tool User Agent"

Stage 5: `project`

| project TimeGenerated, Message, SrcIpAddr, DstIpAddr, UrlOriginal, HttpUserAgentOriginal

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
`EventType`	eq	`proxylogs` transforms: `cased`
`HttpUserAgentOriginal`	match	`BFAC` `Havij` `arachni/` `brutus` `cgichk` `crimscanner/` `inspath` `metis` `vega/` `whcc/` `zmeu` `(hydra)` `FHScan Core` `Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-PT; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)` `absinthe` `bsqlbf` `core-project/1.0` `datacha0s` `dirbuster` `domino hunter` `dotdotpwn` `floodgate` `get-minimal` `gootkit auto-rooter scanner` `grendel-scan` `internet ninja` `jaascois` `masscan` `morfeus fucking scanner` `mysqloit` `n-stealth` `nsauditor` `pangolin` `pmafind` `ruler` `security scan` `springenwerk` `sql power injector` `sqlmap` `sqlninja` `teh forest lobster` `toata dragostea` `uil2pn` `voideye` `webshag` `webvulnscan`

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
`DstIpAddr`	`project`
`HttpUserAgentOriginal`	`project`
`Message`	`project`
`SrcIpAddr`	`project`
`TimeGenerated`	`project`
`UrlOriginal`	`project`

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`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)

Cisco Cloud Security - Hack Tool User-Agent Detected

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: `user_agents`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `extend`

Stage 5: `project`

Indicators

Output fields

Keyboard shortcuts

Search operators

Cisco Cloud Security - Hack Tool User-Agent Detected

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: user_agents

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: extend

Stage 5: project

Indicators

Output fields

Let binding: `user_agents`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `extend`

Stage 5: `project`