Suspicious Data Exfiltration to Elasticsearch Bulk API via ps_script

ATT&CK techniques

Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1567Exfiltration Over Web Service
Impact

What it detects

This rule detects PowerShell script content that posts data to an Elasticsearch bulk ingest endpoint targeting a systeminfo index. A threat actor abused an Elastic Cloud SIEM trial as exfiltration infrastructure by shipping collected host data to an attacker-controlled cluster via the _bulk API, so this pattern indicates outbound staging of stolen system information to a cloud index.

Reporting behind it

Related detections9 linkedT1567 — drag to rearrange

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Suspicious SNS Email Subscription for Data Exfiltration

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Malicious TeamPCP LiteLLM Credential Exfiltration C2 Lookup (via dns_query)

Malicious Shai-Hulud Data Exfiltration Script Execution via Process Creation

Suspicious Data Exfiltration to Elasticsearch Bulk API via ps_script

Pivot detection · T1567 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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