Files being changed when moving them

You might want to try out xcopy from the command line. You can expressly copy all files and retain the ownership and audit permissions ( /x option ).

Microsoft Corporation

I would try copying a few files this way and see if that avoids this issue.

I'd recommend a full scan with Malwarebyte's Anti-Malware. This sounds like a virus to me.

FliGi7 said:

What A/V and backup programs are you using? It might be a case where another piece of software grabbed it mid-move to analyze it or modify it for whatever reason.

I did think this could be caused by my AV software, I'm using MS Security Essentials, and have the real time protection on. So it is possible that it decided to analyse the files as they were being moved and for some reason changed the metadata.
For backup I'm using Beyond Compare. I'm not quite sure what metadata it copies, but I think it copies permissions, date modified, etc. but not the date created.

FliGi7 said:

You might want to try out xcopy from the command line. You can expressly copy all files and retain the ownership and audit permissions ( /x option ).

Thanks for the advice on xcopy, I'll keep it in mind, but I've never had any problem with copying before. Just this one time when I moved files on the same partition. Normally if I have to move a few GB of files from one partition to another, I'll copy them using Beyond Compare, then run a binary comparison using Beyond Compare to check they copied okay, then delete the original files.

MacGyvr said:

I'd recommend a full scan with Malwarebyte's Anti-Malware. This sounds like a virus to me.

I guess it could be a virus, but it seems more likely to me that it would be a bug in Windows or my AV software as FliGi7 suggested. I will do a scan with MS Security Essentials just in case though.

djeyewater said:

FliGi7 said:

What A/V and backup programs are you using? It might be a case where another piece of software grabbed it mid-move to analyze it or modify it for whatever reason.

I did think this could be caused by my AV software, I'm using MS Security Essentials, and have the real time protection on. So it is possible that it decided to analyse the files as they were being moved and for some reason changed the metadata.
For backup I'm using Beyond Compare. I'm not quite sure what metadata it copies, but I think it copies permissions, date modified, etc. but not the date created.

FliGi7 said:

You might want to try out xcopy from the command line. You can expressly copy all files and retain the ownership and audit permissions ( /x option ).

Thanks for the advice on xcopy, I'll keep it in mind, but I've never had any problem with copying before. Just this one time when I moved files on the same partition. Normally if I have to move a few GB of files from one partition to another, I'll copy them using Beyond Compare, then run a binary comparison using Beyond Compare to check they copied okay, then delete the original files.

MacGyvr said:

I'd recommend a full scan with Malwarebyte's Anti-Malware. This sounds like a virus to me.

I guess it could be a virus, but it seems more likely to me that it would be a bug in Windows or my AV software as FliGi7 suggested. I will do a scan with MS Security Essentials just in case though.

I'll say it again....I recommend a full scan with Malwarebyte's Anti-Malware. It will find things that MSE will not.

MacGyvr said:

I'll say it again....I recommend a full scan with Malwarebyte's Anti-Malware. It will find things that MSE will not.

Thanks for the advice, I didn't realise that. I scanned with MSE first, which found a (potential?) java exploit, and then after deleting the suspect file, scanned with MBAM, which didn't find anything.