Unusual Network Activity from a Windows System Binary
editUnusual Network Activity from a Windows System Binary
editIdentifies network activity from unexpected system applications. This may indicate adversarial activity as these applications are often leveraged by adversaries to execute code and evade detection.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- winlogbeat-*
- logs-windows.*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 103
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by process.entity_id with maxspan=5m
[process where event.type == "start" and
/* known applocker bypasses */
(process.name : "bginfo.exe" or
process.name : "cdb.exe" or
process.name : "control.exe" or
process.name : "cmstp.exe" or
process.name : "csi.exe" or
process.name : "dnx.exe" or
process.name : "fsi.exe" or
process.name : "ieexec.exe" or
process.name : "iexpress.exe" or
process.name : "installutil.exe" or
process.name : "Microsoft.Workflow.Compiler.exe" or
process.name : "MSBuild.exe" or
process.name : "msdt.exe" or
process.name : "mshta.exe" or
process.name : "msiexec.exe" or
process.name : "msxsl.exe" or
process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or
process.name : "regsvr32.exe" or
process.name : "xwizard.exe")]
[network where
(process.name : "bginfo.exe" or
process.name : "cdb.exe" or
process.name : "control.exe" or
process.name : "cmstp.exe" or
process.name : "csi.exe" or
process.name : "dnx.exe" or
process.name : "fsi.exe" or
process.name : "ieexec.exe" or
process.name : "iexpress.exe" or
process.name : "installutil.exe" or
process.name : "Microsoft.Workflow.Compiler.exe" or
process.name : "MSBuild.exe" or
process.name : "msdt.exe" or
process.name : "mshta.exe" or
(
process.name : "msiexec.exe" and not
dns.question.name : (
"ocsp.digicert.com", "ocsp.verisign.com", "ocsp.comodoca.com", "ocsp.entrust.net", "ocsp.usertrust.com",
"ocsp.godaddy.com", "ocsp.camerfirma.com", "ocsp.globalsign.com", "ocsp.sectigo.com", "*.local"
)
) or
process.name : "msxsl.exe" or
process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or
process.name : "regsvr32.exe" or
process.name : "xwizard.exe")]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Trusted Developer Utilities Proxy Execution
- ID: T1127
- Reference URL: https://attack.mitre.org/techniques/T1127/