IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Halfbaked Command and Control Beacon

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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-*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Network
Threat Detection
Command and Control

Version: 3 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.11.2

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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This rule should be tailored to exclude systems, either as sources or destinations, in which this behavior is expected.

Investigation guide

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This activity has been observed in FIN7 campaigns.

Rule query

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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)

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Application Layer Protocol
- ID: T1071
- Reference URL: https://attack.mitre.org/techniques/T1071/

Rule version history

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Version 3 (7.11.2 release)

Formatting only

Version 2 (7.11.0 release)

Formatting only

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