Hoping this is all nothing but some strange files have started appearing in my Windows directory. They all come in pairs : a DAT file and an application file - both with the same filename. At least 1 pair of these files appear each day. They all have a 6 to 8 numerical digit file name (e.g. 3422037 or 44715657). All files are small (8k applications and the DAT files simply contain '<<<<') and show no signs of being accessed after creation. All are unhidden and can be deleted normally. Looks very dodgy and after one MBAM scan several were picked up as rootkit agents. Many more though were left behind and scans since (with MBAM, SAS and A-Squared) reveal nothing. A HijackThis log revealed nothing.....although I'm not sure what I really should be looking for. Lastly OA and A-Squared guard (Mamatu) show no signs of anything untoward happening. Any thoughts of what this might be and what can be done if it is a rootkit?