Suspicious PowerShell Script Fetching Remote Batch File From Paste Site (via ps_script)

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects PowerShell script blocks that reference a paste site alongside a batch file extension, matching the download-and-execute behavior in Deep Instinct's Regex Gone Rogue analysis. The macro-launched PowerShell retrieves and runs a .bat file hosted on Pastebin. This indicates staged remote payload delivery and execution through a living-off-the-land interpreter.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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Suspicious Hidden PowerShell WebClient DownloadFile Cradle

Suspicious PowerShell Download Cradle with Spoofed User-Agent via MSIX

Malicious PowerShell In-Memory Download Cradle via Script Block (via ps_script)

Suspicious node.exe Execution Spawned by PowerShell

Suspicious PowerShell Download Cradle via IEX and DownloadString (via process_creation)

Suspicious PowerShell Script Fetching Remote Batch File From Paste Site (via ps_script)

Pivot detection · T1059.001 · 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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