Malware uses many tricks to hide its process, and one of the most common is known as RunPE. Essentially this involves starting a known and trusted process - Explorer.exe, say - then replacing its code with the malware's own.
Phrozen RunPE Detector is a free tool which scans the headers of your processes in memory, and compares them to their disk images. If a process has been exploited by RunPE then there should be a difference, and you'll see an alert.
Phrozen RunPE Detector can even try to remove whatever malware it detects, although we wouldn't rely on it being successful: if you find something, then we'd recommend using a full-strength antivirus engine to investigate further.
The other small bonus here is that Phrozen RunPE Detector allows you to close multiple processes in a single operation (right-click, Kill...).
Note also that the program can't yet scan 64-bit processes (though it can check 32-bit processes on 64-bit Windows).
Verdict:
Phrozen RunPE Detector doesn't do very much, but it really can identify RunPE-based malware, and as it's both a) quick and b) no-strings free we'd recommend grabbing a copy for your security toolkit.
Your Comments & Opinion
Comprehensive fully-featured security suite
Block malware with China's favourite antivirus tool
Protect your personal privacy with this exceptionally thorough security tool
Protect your privacy by clearing program and Windows' logs
AVGs mid-range security suite for all your devices
Combined AVAST and AVG technology for one powerful free security tool
Avast's premium security suite is more powerful than ever