Detecting Fileless Attacks on Endpoints

When to Use

Use this skill when:

• Building detection rules for fileless malware that operates entirely in memory
• Hunting for PowerShell-based attacks, reflective DLL injection, and WMI abuse
• Configuring endpoint telemetry (Sysmon, AMSI, PowerShell logging) to capture fileless indicators
• Investigating incidents where traditional AV found no malicious files

Do not use for detecting file-based malware or for malware reverse engineering.

Prerequisites

• Sysmon with process creation and WMI event logging enabled
• PowerShell Script Block Logging and Module Logging enabled
• AMSI (Antimalware Scan Interface) enabled for script content inspection
• EDR with behavioral detection capabilities (MDE, CrowdStrike, SentinelOne)

Workflow