Ubiquiti - Possible connection to cryptominning pool

Status: available
Severity: medium
Time window: 1h
Source: github.com/Azure/Azure-Sentinel

'Detects connections which may indicate that device is infected with cryptominer.'

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1071` Application Layer Protocol `T1095` Non-Application Layer Protocol `T1571` Non-Standard Port

Rule body

id: 7feb3c32-2a11-4eb8-a2d7-e3792b31cb80
name: Ubiquiti - Possible connection to cryptominning pool
description: |
  'Detects connections which may indicate that device is infected with cryptominer.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: CustomLogsAma
    dataTypes:
      - Ubiquiti_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
  - T1095
  - T1571
query: |
  let susp_dst_ports = dynamic(['14433', '14444', '3333', '3334', '3335', '3336', '4444', '45560', '45700', '5555', '5556', '6666', '7777', '8788', '8888', '8899', '9999', '10034']);
  UbiquitiAuditEvent
  | where ipv4_is_private(SrcIpAddr)
  | where ipv4_is_private(DstIpAddr) == 'False'
  | where DstPortNumber in (susp_dst_ports)  or (DnsQuery contains 'pool' and DnsQuery contains 'xmr')
  | extend IPCustomEntity = SrcIpAddr
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.2
kind: Scheduled

Stages and Predicates

Let binding: `susp_dst_ports` used in Stage 4

let susp_dst_ports = dynamic(['14433', '14444', '3333', '3334', '3335', '3336', '4444', '45560', '45700', '5555', '5556', '6666', '7777', '8788', '8888', '8899', '9999', '10034']);

Stage 1: `source`

UbiquitiAuditEvent

Stage 2: `where`

| where ipv4_is_private(SrcIpAddr)

Stage 3: `where`

| where ipv4_is_private(DstIpAddr) == 'False'

Stage 4: `where`

| where DstPortNumber in (susp_dst_ports)  or (DnsQuery contains 'pool' and DnsQuery contains 'xmr')

Stage 5: `extend`

| extend IPCustomEntity = SrcIpAddr

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`DstIpAddr`	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`	`excludes:DstIpAddr`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`DnsQuery`	contains	`pool` `xmr`	`field:"DnsQuery" kind:contains`
`DstPortNumber`	in	`10034` `14433` `14444` `3333` `3334` `3335` `3336` `4444` `45560` `45700` `5555` `5556` `6666` `7777` `8788` `8888` `8899` `9999`	`field:"DstPortNumber" kind:in`
`SrcIpAddr`	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`	`field:"src_ip" kind:cidr_match`

Output fields

These fields are emitted when the rule matches.

Field	Source
`IPCustomEntity`	`extend`

Ubiquiti - Possible connection to cryptominning pool

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Let binding: susp_dst_ports used in Stage 4

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: extend