Proxmark3 community

kostique

Contributor

Registered: 2019-12-02

Posts: 5

FDX-A pet tag!

Hi, everyone. I've got a few FDX-A glass tags with following characteristics:

Recognition Mode: Read-write
Chip Capacity: 330bit
Chip Type: Contactless ID Card
Model Number: ST-G
Contours: Alien Card
Frequency: 125KHz
Item: FDX-A Animal microchip
Standard: ISO11784/785
Protocol: FDX-A
Frequency: 125KHz
Chip type: T5577
Writable: yes

They all are detected by my PM3 as HID prox tags when I execute <lf search u>. The console output is smth. like this:

HID Prox TAG ID: 20978020570
Invalid or unsupported tag length.
Valid HID Prox ID Found!

Here is my question: is there any way to wipe such tag somehow (as it is based on a t5577) and write some em4305 pattern to it to use this tag then like ID card.
Thank you for your answers.

kostique

Contributor

Registered: 2019-12-02

Posts: 5

Re: FDX-A pet tag!

Hi, all. Want to share with you what I've already managed to do by this time.
First of all, I broke one of those tags and solder some valid t5577 chip (dug it out before from a key fob) to its antenna coil. Works fine so far with device in which I embedded that Franky-transponder.
Took a lot of time and broken tags, thus I still hope for your help. As for some more sophisticated way to solve my problem: I got an HID prox card which reacts on <lf search u> with smth like this:

HID Prox TAG ID: 000035179         
Invalid or unsupported tag length.         
Valid HID Prox ID Found!
Valid T55xx Chip Found
Try lf t55xx ... commands

I supposed that my glass tags would react in the same way but as you know they give smth like this:

HID Prox TAG ID: 20978020570
Invalid or unsupported tag length.
Valid HID Prox ID Found!

The seller said that those all are T5577 based. Could it be so or he just lied?

Last edited by kostique (2019-12-05 21:19:47)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,537

Website

Re: FDX-A pet tag!

animal tag should work with the lf fdx commands...

kostique

Contributor

Registered: 2019-12-02

Posts: 5

Re: FDX-A pet tag!

@iceman, Thank you for you reply. Tried a few ^ lf fdx read ^. No output at all. Firmware is official. Maybe special antenna is needed.

mwalker

Moderator

Registered: 2019-05-11

Posts: 318

Re: FDX-A pet tag!

I assume this is one of the implant tags ?
If so, from what I a have read, it can be tricky to get a good link with the proxmark stock antenna.
the fact that you can read something means the tag is getting energized and transmitting some data.

If they are meant to be "t5577" tags what is the result of
lf t55 detect
and
lf t55 dump

kostique

Contributor

Registered: 2019-12-02

Posts: 5

Re: FDX-A pet tag!

@mwalker, thanks for staying curious about my post! Yes, these are those well known implant tags. But as I had worked with them a bit, they didn't seem to me troubled in detecting and even writing. As you probably read my second post, I disconnected factory chip on one of these tags and connected its antenna to 4x5mm t5577 chip. Then I cloned to it a em4305 pattern from my front-door key fob without any efforts.
As for your questions about t55xx commands:
<lf t55 detect> - produces the same output as if you would try to identify one of your cats but that one without any tags ever injected to poor. More precisely:

<lf t55 detect>
Could not detect modulation automatically. Try setting it manually with 'lf t55xx config'

And 2 blank tables after <lf t55 dump> as you've already guessed.

Last edited by kostique (2019-12-06 23:05:22)