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#1 2018-03-06 18:27:57

homer2320776
Contributor
Registered: 2018-01-30
Posts: 7

Trying to 'clone' xceedID 37-bit to T55x7.

Hello,

I've been able to use the Proxmark to clone tags that I physically have access to with no issues. We have an employee who lost her fob and I've been trying to write her credentials to a T55x7. I don't have a dump of her card but I was able to determine what the tag ID should have been by reading through some spares.

All of the spares that I read I can clone perfectly to the T55 fobs, but when I try to "guess" her info, it won't work.

Any advise?

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#2 2018-03-06 18:45:42

iceman
Administrator
Registered: 2013-04-25
Posts: 9,538
Website

Re: Trying to 'clone' xceedID 37-bit to T55x7.

Too broad question.   If possible specify details like how you convert xceedID 37b  FC/CN  to hex,  and how you built the t55x7 blocks needed.  Then we can look at the sought after credential and see where it went wrong.

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#3 2018-03-06 19:31:48

homer2320776
Contributor
Registered: 2018-01-30
Posts: 7

Re: Trying to 'clone' xceedID 37-bit to T55x7.

When I did a search on my fob, it showed: 

HID Prox TAG ID: 054693527 (39571) - Format Len: 37bit - FC: 1350 - Card: 301715

Detecting and Dumping my fob shows:

proxmark3> lf t55 det
Chip Type  : T55x7
Modulation : FSK2a
Bit Rate   : 4 - RF/50
Inverted   : Yes
Offset     : 32
Seq. Term. : No
Block0     : 0x60107C60

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 60107C60 | 01100000000100000111110001100000
  1 | 1D555555 | 00011101010101010101010101010101
  2 | 66656996 | 01100110011001010110100110010110
  3 | 5A66596A | 01011010011001100101100101101010
  4 | 00000000 | 00000000000000000000000000000000
  5 | 00000000 | 00000000000000000000000000000000
  6 | 00000000 | 00000000000000000000000000000000
  7 | 00000000 | 00000000000000000000000000000000
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 60107C60 | 01100000000100000111110001100000
  1 | C02A1499 | 11000000001010100001010010011001
  2 | 991B238F | 10011001000110110010001110001111
  3 | 00000000 | 00000000000000000000000000000000

Cloning my fob to a T55x7, detect & dump:

proxmark3> lf hid clone 054693527
Cloning tag with ID 054693527
#db# DONE!
proxmark3> lf t55 det
Chip Type  : T55x7
Modulation : FSK2a
Bit Rate   : 4 - RF/50
Inverted   : Yes
Offset     : 32
Seq. Term. : No
Block0     : 0x00107060

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00107060 | 00000000000100000111000001100000
  1 | 1D555555 | 00011101010101010101010101010101
  2 | 66656996 | 01100110011001010110100110010110
  3 | 5A66596A | 01011010011001100101100101101010
  4 | 00000000 | 00000000000000000000000000000000
  5 | 00000000 | 00000000000000000000000000000000
  6 | 00000000 | 00000000000000000000000000000000
  7 | 00000000 | 00000000000000000000000000000000
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00107060 | 00000000000100000111000001100000
  1 | C02A14DB | 11000000001010100001010011011011
  2 | 173081EC | 00010111001100001000000111101100
  3 | 00000000 | 00000000000000000000000000000000
proxmark3> lf search
NOTE: some demods output possible binary
  if it finds something that looks like a tag
False Positives ARE possible


Checking for known tags:

HID Prox TAG ID: 054693527 (39571) - Format Len: 37bit - FC: 1350 - Card: 301715

Valid HID Prox ID Found!

Valid T55xx Chip Found
Try lf t55xx ... commands

This cloned card works perfectly on every system I try, the same cannot be said for my attempted clone of the missing fob.

I know that her fob number is 301755

I started counting up from my TAG ID and got to 054693576 , which when I did an: 

proxmark3> lf hid clone 054693576
Cloning tag with ID 054693576
#db# DONE!
proxmark3> lf search
NOTE: some demods output possible binary
  if it finds something that looks like a tag
False Positives ARE possible


Checking for known tags:

HID Prox TAG ID: 054693576 (39611) - Format Len: 37bit - FC: 1350 - Card: 301755

Valid HID Prox ID Found!

Valid T55xx Chip Found
Try lf t55xx ... commands

This fob as it is show an invalid card format on the readers I try to use it on.

Here is the dump of the cloned card that does not work:

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00107060 | 00000000000100000111000001100000
  1 | 1D555555 | 00011101010101010101010101010101
  2 | 66656996 | 01100110011001010110100110010110
  3 | 5A666A69 | 01011010011001100110101001101001
  4 | 00000000 | 00000000000000000000000000000000
  5 | 00000000 | 00000000000000000000000000000000
  6 | 00000000 | 00000000000000000000000000000000
  7 | 00000000 | 00000000000000000000000000000000
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00107060 | 00000000000100000111000001100000
  1 | C02A14DB | 11000000001010100001010011011011
  2 | 173081EC | 00010111001100001000000111101100
  3 | 00000000 | 00000000000000000000000000000000
proxmark3>

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#4 2018-03-09 21:50:29

homer2320776
Contributor
Registered: 2018-01-30
Posts: 7

Re: Trying to 'clone' xceedID 37-bit to T55x7.

Is this what was needed? Or do I need to post something else?

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#5 2018-04-06 19:08:34

homer2320776
Contributor
Registered: 2018-01-30
Posts: 7

Re: Trying to 'clone' xceedID 37-bit to T55x7.

Finally was able to figure this out. I was apparently 1 digit off on the TAG ID.

I was trying to use

HID Prox TAG ID: 054693576 (39611) - Format Len: 37bit - FC: 1350 - Card: 301755

But ended up having to use

HID Prox TAG ID: 054693577 (39611) - Format Len: 37bit - FC: 1350 - Card: 301755

I only determined this as I was using my own FOB as a test, and noticed that the result the wiegand caluclator didn't match the scan

pm3 --> lf search
HID Prox TAG ID: 054693527 (39571) - Format Len: 37bit - FC: 1350 - Card: 301715
Valid HID Prox ID Found!

Valid T55xx Chip Found
Try `lf t55xx` commands

pm3 --> lf hid wiegand 0 1350 301715
HID | OEM | FC   | CN      |  Wiegand  |  HID Formatted
----+-----+------+---------+-----------+--------------------
 37 | 000 | 1350  | 301715  | 54693526  |  3000000000000000
 0 49a93

Dunno what difference this made but the cloned card works perfectly!

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