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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Network Connection via Signed Binary

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Network Connection via Signed Binary

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Binaries signed with trusted digital certificates can execute on Windows systems protected by digital signature validation. Adversaries may use these binaries to live off the land and execute malicious files that could bypass application allowlists and signature validation.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Defense Evasion

Version: 5 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Rule query

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sequence by process.entity_id [process where (process.name :
"expand.exe" or process.name : "extrac.exe" or
process.name : "ieexec.exe" or process.name : "makecab.exe") and
event.type == "start"] [network where (process.name : "expand.exe"
or process.name : "extrac.exe" or process.name :
"ieexec.exe" or process.name : "makecab.exe") and not
cidrmatch(destination.ip, "10.0.0.0/8", "172.16.0.0/12",
"192.168.0.0/16")]

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Signed Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Signed Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/

Rule version history

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Version 5 (7.10.0 release)

Updated query, changed from:

event.category:network and event.type:connection and
process.name:(expand.exe or extrac.exe or ieexec.exe or makecab.exe)
and not destination.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16)

Version 4 (7.9.1 release)

Formatting only

Version 3 (7.9.0 release)

Updated query, changed from:

process.name:(expand.exe or extrac.exe or ieexec.exe or makecab.exe)
and event.action:"Network connection detected (rule: NetworkConnect)"
and not destination.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16)

Version 2 (7.7.0 release)

Updated query, changed from:

(process.name:expand.exe or process.name:extrac.exe or
process.name:ieexec.exe or process.name:makecab.exe) and
event.action:"Network connection detected (rule: NetworkConnect)" and
not destination.ip:10.0.0.0/8 and not destination.ip:172.16.0.0/12 and
not destination.ip:192.168.0.0/16

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