*I updated MBAM and ran a quick scan. I keep my desktop icons hidden, using my task bar icons. Seeing PUM.Hidden.Desktop, I quarantined and rebooted. (see below) Malwarebytes' Anti-Malware 1.51.2.1300 www.malwarebytes.org Database version: 911122705 Windows 6.1.7601 Service Pack 1 Internet Explorer 9.0.8112.16421 12/27/2011 3:22:26 PM mbam-log-2011-12-27 (15-22-26).txt Scan type: Quick scan Objects scanned: 168980 Time elapsed: 36 second(s) Memory Processes Infected: 0 Memory Modules Infected: 0 Registry Keys Infected: 0 Registry Values Infected: 0 Registry Data Items Infected: 1 Folders Infected: 0 Files Infected: 0 Memory Processes Infected: (No malicious items detected) Memory Modules Infected: (No malicious items detected) Registry Keys Infected: (No malicious items detected) Registry Values Infected: (No malicious items detected) Registry Data Items Infected: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideIcons (PUM.Hidden.Desktop) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully. Folders Infected: (No malicious items detected) Files Infected: (No malicious items detected) *I rebooted my computer and ran a complete MBAM scan. PUM.Hidden.Desktop registered again and I quarantined and rebooted. (see below) Malwarebytes' Anti-Malware 1.51.2.1300 www.malwarebytes.org Database version: 911122705 Windows 6.1.7601 Service Pack 1 Internet Explorer 9.0.8112.16421 12/27/2011 4:10:44 PM mbam-log-2011-12-27 (16-10-44).txt Scan type: Full scan (C:\|) Objects scanned: 311283 Time elapsed: 20 minute(s), 59 second(s) Memory Processes Infected: 0 Memory Modules Infected: 0 Registry Keys Infected: 0 Registry Values Infected: 0 Registry Data Items Infected: 1 Folders Infected: 0 Files Infected: 0 Memory Processes Infected: (No malicious items detected) Memory Modules Infected: (No malicious items detected) Registry Keys Infected: (No malicious items detected) Registry Values Infected: (No malicious items detected) Registry Data Items Infected: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideIcons (PUM.Hidden.Desktop) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully. Folders Infected: (No malicious items detected) Files Infected: (No malicious items detected) *I allowed my desktop icons to be viewed and ran a full MBAM scan. PUM.Hidden.Desktop did not register. (see below) Malwarebytes' Anti-Malware 1.51.2.1300 www.malwarebytes.org Database version: 911122705 Windows 6.1.7601 Service Pack 1 Internet Explorer 9.0.8112.16421 12/27/2011 4:36:31 PM mbam-log-2011-12-27 (16-36-31).txt Scan type: Full scan (C:\|) Objects scanned: 311130 Time elapsed: 23 minute(s), 40 second(s) Memory Processes Infected: 0 Memory Modules Infected: 0 Registry Keys Infected: 0 Registry Values Infected: 0 Registry Data Items Infected: 0 Folders Infected: 0 Files Infected: 0 Memory Processes Infected: (No malicious items detected) Memory Modules Infected: (No malicious items detected) Registry Keys Infected: (No malicious items detected) Registry Values Infected: (No malicious items detected) Registry Data Items Infected: (No malicious items detected) Folders Infected: (No malicious items detected) Files Infected: (No malicious items detected) *I then ran a full MBAM scan with my desktop icons hidden to confirm this false positive. (see below) Malwarebytes' Anti-Malware 1.51.2.1300 www.malwarebytes.org Database version: 911122705 Windows 6.1.7601 Service Pack 1 Internet Explorer 9.0.8112.16421 12/27/2011 4:58:24 PM mbam-log-2011-12-27 (16-58-24).txt Scan type: Full scan (C:\|) Objects scanned: 311152 Time elapsed: 20 minute(s), 38 second(s) Memory Processes Infected: 0 Memory Modules Infected: 0 Registry Keys Infected: 0 Registry Values Infected: 0 Registry Data Items Infected: 1 Folders Infected: 0 Files Infected: 0 Memory Processes Infected: (No malicious items detected) Memory Modules Infected: (No malicious items detected) Registry Keys Infected: (No malicious items detected) Registry Values Infected: (No malicious items detected) Registry Data Items Infected: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\HideIcons (PUM.Hidden.Desktop) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully. Folders Infected: (No malicious items detected) Files Infected: (No malicious items detected) *I didn't have a detection hit until I updated to Database version: 911122705. Previous Database versions didn't detect anything whilst I keep my desktop icons hidden. I believe PUM.Hidden.Desktop is a false positive since I can induce this hit from manually hiding or viewing my desktop icons. H.P. Pavilion P6000 Series, Model p6703w Microsoft Windows Ultimate 64 Bit O.S. S.P.1 AMD Athlon 640 3000MHz Quad Core Processor MBAM Free Version Norton 360 v5