Suspicious Web Browser Spawning Scripting or Command Interpreter (via process_creation)

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
- T1204User Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a web browser process spawning PowerShell, cmd or scripting hosts, an abnormal chain seen when FileFix lures deliver malware through the browser. Such execution indicates the browser was used as a delivery vector to launch a RAT or infostealer on the host.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

Malicious PowerShell Spawned by File Explorer via FileFix Social Engineering (via process_creation)

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Suspicious Scheduled Task Creation in Public Writable Directory via schtasks (via process_creation)

Suspicious Base64 Encoded PowerShell Command Linked to Chinese APT Techniques

Suspicious Scheduled Task Executing Payload from AppData

Malicious PowerShell Runtime Loaded Outside PowerShell Host

Suspicious PowerShell Harvesting RDP Logon Events via Get-WinEvent

Suspicious PowerShell Web Request to oastify Out-of-Band Domain

Suspicious PowerShell Execution of Untitled1 Script From ProgramData

Suspicious Web Browser Spawning Scripting or Command Interpreter (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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