Suspicious PowerShell Download to Temp and In-Memory Execution via IEX (via process_creation)

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 using iwr to save content into the temp directory and then piping it to iex for in-memory execution. TA427 pasted this ClickFix command to fetch a payload to a temp file and immediately run it.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

Suspicious ClickFix cv.bat Staging in Temp via PowerShell (via process_creation)

Malicious Silver Fox PowerShell Download Cradle via irm and iex (via process_creation)

Malicious DAEMON Tools Supply Chain Payload Download via PowerShell WebClient (via process_creation)

Suspicious PowerShell Remote File Download Cmdlets (via ps_script)

Suspicious PowerShell Download Cradle Writing Executable To Windows Temp

Suspicious File Download via PowerShell WebClient DownloadFile

Suspicious Encoded PowerShell DownloadString Execution

Suspicious PowerShell Download Cradle via Invoke-WebRequest Piped to iex (via process_creation)

Suspicious PowerShell Reverse-HTTP Shellcode Download via CVE-2024-4577 Exploitation

Suspicious PowerShell Download to Temp and In-Memory Execution via IEX (via process_creation)

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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