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I was using my UK bank account debit card in India, to buy few flight tickets for my inter city travel. Using my own laptop, in a co-working space.

Website used : www.makemytrip.com -- is one of the top Indian online travel companies.

First transaction worked fine. I had few more tickets to book. Second transaction failed, saying bank could not process this request. Tried again. got the same error message.

Soon Got a call from my UK banks anti fraud team, saying my card is blocked and canceled as a transaction attempt was made on Indian e-commerce website Jabong for a total of INR 52,000. I have not done any such transaction. Jabong is a good website; leading e-commerce in India.

They said there were two failed attempts on makemytrip.com; Failure reason was incorrect information entered. I was sure I entered correct information on the failed transactions. During this process of failed transactions; someone hacked my card details and used it maliciously on Jabong website.

The Bank could not give me more details as they are not authorized to give more information

I want to know how this is possible from a technical point of view.
Website was not a phishing website.
I was on https. Antivirus McAfee running with all updates.

My doubts are chrome extensions or other open tabs? wifi network?
How is this possible? Is there a possibility that my bank just canceled because transactions were from India? But if then how did they specify amount of the fraud transaction and e-commerce website it was tried on.

Should this question be asked in another place?

ThankYou

EDIT:

The amount i was making on the makemytrip app was not equivalent to the fraud amount. fraud amount was 5 times higher .

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    Welcome Rex. You may be get better answers on security.stackexchange.com Please post this there. – Dheer Oct 25 '18 at 9:47
  • Can you also specify if the amount you were buying on the makemytrip was same as that of fraud; i.e. Rs 52,000? – Dheer Oct 25 '18 at 9:52
  • Were you on a secured or open wi-fi network? – mkennedy Oct 25 '18 at 20:19
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    You realize INR 52,000 is only 500 pounds? – Fattie Oct 26 '18 at 14:07
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    "I want to know how this is possible from a technical point of view." Then you are on the wrong site of this network and should ask on "security" instead, they will show you countless possibilities of how this could have happened. – mastov Oct 26 '18 at 14:27
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My doubts are chrome extensions or other open tabs? wifi network? How is this possible?

It could be due to a malicious chrome extension. This could have intercepted the card details and sent it to hacker; he would have then used it to make the purchases on Jabong website. WiFi looks less likely but possible.

Is there a possibility that my bank just canceled because transactions were from India? But if then how did they specify amount of the fraud transaction and e-commerce website it was tried on.

It is possible; but unlikely. Banks do monitor the transactions and flag any irregular behavior. More so as the Bank mentioned the fraudulent use on other site.

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    @Rex "Is there a possibility that my bank just canceled because transactions were from India" very unlikely in this case. Some banks might block any Indian transaction, especially if you hadn't told them you were going there (my bank has facilities for letting them know when/where you are abroad), but if this was the case, they would have mentioned one of the transactions you attempted, not an unknown (to you) transaction with Jabong. – TripeHound Oct 25 '18 at 12:43
  • "very unlikely ...." I get cards flagged all the time due to "bizarre!" activity ("YOU WENT TO SINGAPORE?" sort of thing.) ... "... very unlikely in this case" yes, I agree. For me the "obvious" explanation here is that it WAS just some sort of variation of the transaction actually made. it would be utterly normal that shoddy online departments ("helpfully") ran the transaction twice, or it went through BOTH SBI and Axis, or .. who knows. – Fattie Oct 26 '18 at 14:24
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  1. www.makemytrip.com is a joke, even though it looks professional. I wouldn't be in the slightest surprised if, per se, someone/everyone inside it was having a peek.

setting that aside,

  1. yes, the simplest explanation is that

    • of course nobody "hacked! your wifi!" or similar, and
    • regarding the "facts" your card company generously offered you, it's simply the case that makemytrip is hooked up with Jabong somehow, hence the confusion, and,
    • as you know,
    • it's utterly normal that banks "cancel credit cards" because, basically, you "used the card in India" (or some other shocking! bizarre! region){1}
    • you are probably aware that in India, very little processing is done "in house" by web sites, there's always some involvement of SBI, Axis / whatever, which endlessly confuses matters
    • and my contribution to this "simplest explanation" is:
    • you have mixed up the amounts somehow; it was indeed actually the same/similar amount to what you actually spent

that being said,

  1. Very surprisingly it does seem to be the case that hackers can grab card numbers. I can only see this as being part of some sort of inside situation. I have buildings full of folks to keep my stupid MacBook safe, but the other day, sure enough, someone in Brazil tried to charge 50 cents on one of my cards (a USA card .. Visa), so they promptly (and thankfully) cancelled it. (Astonishingly, they got me a new one, the next morning by 9am via Fedex - no charge!)

I'm sort of in the same camp as you

  • it does seem to happen
  • I just can't fathom how it happens. Explanations like "EM keystroke loggers!!!!" are just silly. Most people like yourself and even me are immune to genuine, "!!!hacker!!!" stuff like MITM, actual viruses, wifi snopping and so on. I really think lots of cards get looky-looked at by processors, subprocessors, contractors and so on. There's no other simple explanation for how this can happen.
  • Unfortunately the folks on security.stackexchange (while normally worthy) won't have a clue and will in this case just blether about EM keystroke loggers etc. But you should also ask there for sure.

{1} .. I had a funny on the other day where i used a US card on a UK (how bizarre!) government (omg! shocking!) web site and Mastercard called in a blind panic to see what was going on. I was only barely able to convince 'em not to cancel!

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