Halfbaked Command and Control Beacon

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Halfbaked is a malware family used to establish persistence in a contested network. This rule detects a network activity algorithm leveraged by Halfbaked implant beacons for command and control.

Rule type: query

Rule indices:

  • packetbeat-*
  • auditbeat-*
  • filebeat-*
  • logs-network_traffic.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Use Case: Threat Detection
  • Tactic: Command and Control
  • Domain: Endpoint

Version: 103

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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## Threat intel

This activity has been observed in FIN7 campaigns.

Rule query

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(event.dataset: (network_traffic.tls or network_traffic.http) or
  (event.category: (network or network_traffic) and network.protocol: http)) and
  network.transport:tcp and url.full:/http:\/\/[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}\/cd/ and
  destination.port:(53 or 80 or 8080 or 443)

Framework: MITRE ATT&CKTM