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bunty
 Post subject: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 0:16 
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Joined: March 9th, 2017, 6:16
Posts: 127
Location: trinidad
I want to add custom file signature of a file in r-studio. I have tried many times as per process described in R-studio manual but I am unable to do the same and create xml file. Can someone pls. help. I can send test file in PM.
Thank You
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bunty
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 4:25 
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Joined: March 9th, 2017, 6:16
Posts: 127
Location: trinidad
Finally I have created 2 signatures .I have taken 2 hex strings since I don't know which one is right (how many hex characters to take)
can someone pls check & correct me

xml download link -- https://drive.google.com/file/d/1kFNsAa ... share_link


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Arch Stanton
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 9:27 
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Joined: May 13th, 2019, 7:50
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I'd go with TAPE \x54\x41\x50\x45

If you don't have the spec you don't know how static rest of the 'header' is and so the larger the signature the more chance you will not pick up files with slightly different 'headers'.

OTOH if you know for a fact that for example first 20 bytes of a header are static, you go with that as it will reduce false positives.

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bunty
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 10:23 
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Joined: March 9th, 2017, 6:16
Posts: 127
Location: trinidad
Arch Stanton wrote:
I'd go with TAPE \x54\x41\x50\x45

If you don't have the spec you don't know how static rest of the 'header' is and so the larger the signature the more chance you will not pick up files with slightly different 'headers'.

OTOH if you know for a fact that for example first 20 bytes of a header are static, you go with that as it will reduce false positives.


Hi Thank you Joep
This is my first case and I have this single file for analysis so could not compare common pattern .
Thanks a lot for pointing out that larger signature has less chances a valuable lesson.I have not added footers because there are none (all zeros)
Thank you :good: :good: :-D


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fzabkar
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 10:42 
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Location: Australia
It's Microsoft Tape Format (MTF). See pages 29 and 34 of the following document.

Microsoft ™ Tape Format Specification Version 1.00a:
http://laytongraphics.com/mtf/MTF_100a.PDF

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fzabkar
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 21st, 2023, 11:13 
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The Soft Filemark Descriptor Block (MTF_SFMB) is described on page 57. There is a list of Descriptor Blocks on page 30.

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bunty
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 22nd, 2023, 10:21 
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Joined: March 9th, 2017, 6:16
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Location: trinidad
fzabkar wrote:
It's Microsoft Tape Format (MTF). See pages 29 and 34 of the following document.

Microsoft ™ Tape Format Specification Version 1.00a:
http://laytongraphics.com/mtf/MTF_100a.PDF


WOW fzabkar :good: :-D
Thank you so much you have gone in depth. Though I didn't understood anything as its too low level it discusses this signature most profoundly.
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fzabkar
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 22nd, 2023, 12:00 
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Joined: September 8th, 2009, 18:21
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Find the TAPE header. The 16-bit word at offset 0x40 then tells you the size, in 512-byte sectors, of the SFMB descriptor block. In your case this is 1 sector.

Now locate the SFMB signature and count forwards by 0x200 bytes. That's the end of your file, IIUC.

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athena
 Post subject: Re: Adding Customs file Signatures in R-studio
PostPosted: October 24th, 2023, 7:37 
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Joined: May 30th, 2014, 0:54
Posts: 153
Location: Universe
fzabkar wrote:
Find the TAPE header. The 16-bit word at offset 0x40 then tells you the size, in 512-byte sectors, of the SFMB descriptor block. In your case this is 1 sector.

Now locate the SFMB signature and count forwards by 0x200 bytes. That's the end of your file, IIUC.

Thanks much useful fzabkar :good:
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