Apache - Command in URI

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

'Detects command in URI'

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1133` External Remote Services `T1190` Exploit Public-Facing Application

Rule body

id: 54da6a42-3b00-11ec-8d3d-0242ac130003
name: Apache - Command in URI
description: |
  'Detects command in URI'
severity: High
status: Available
requiredDataConnectors:
  - connectorId: CustomLogsAma
    datatypes:
      - ApacheHTTPServer_CL
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
relevantTechniques:
  - T1190
  - T1133
query: |
  let cmd_list = dynamic(['whoami', 'dpkg', 'useradd', 'sudo', 'cat']);
  ApacheHTTPServer
  | where UrlOriginal has_any (cmd_list)
  | extend UrlCustomEntity = UrlOriginal
entityMappings:
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: UrlCustomEntity
version: 1.0.3
kind: Scheduled

Stages and Predicates

Parameters

let cmd_list = dynamic(['whoami', 'dpkg', 'useradd', 'sudo', 'cat']);

Stage 1: `source`

ApacheHTTPServer

Stage 2: `where`

| where UrlOriginal has_any (cmd_list)

Stage 3: `extend`

| extend UrlCustomEntity = UrlOriginal

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`UrlOriginal`	match	`cat` transforms: `term` `dpkg` transforms: `term` `sudo` transforms: `term` `useradd` transforms: `term` `whoami` transforms: `term`	`field:"UrlOriginal" kind:match`

Output fields

These fields are emitted when the rule matches.

Field	Source
`UrlCustomEntity`	`extend`

Apache - Command in URI

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`