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Sim port attack or Sim swap attack is when your associated phone number in your other accounts will port to another sim card or another phone that is controlled  by the attacker and they are free to use your phone number now since your phone is connected to different accounts, they will reset the password or use the SMS authentication using the phone number then they are freely easily to open your account.

Who are authorize to port your sim/phone number to another device?
It is only your carrier provider, e.g. AT&T, Smart Communications, T-MOBILE, etc.
-Some attacker here will contact on your carrier provider and some will use some of your personal information just to prove that they are real you.

-I experienced to upgrade my sim card before, in my country, I just went on the store branch of my carrier provider then provide 1 valid id then that's all. I don't know they allowed via phone call.

Tips to avoid this

• Avoid storing your coins or funds for long term in a centralized exchange.
• Avoid using centralized cryptocurrency wallet.
• User hardware wallet or cold wallet.

I have some questions:

1. Is there any carrier provider that allowed you to change your sim card or port to another device via phone call only?
2. If this case happens, can we blame our carrier provider on this or take some legal actions?
and what more tips or advice you can give to avoid this kind of attack.

https://cdn-images-1.medium.com/max/2400/1*-0AtUPyi3NS0EE7DGD-lzA.png

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Sources/References:
The Most Expensive Lesson Of My Life: Details of SIM port hack (https://whatis.techtarget.com/definition/SIM-swap-attack-SIM-intercept-attack)
SIM swap attack (SIM intercept attack) (https://medium.com/coinmonks/the-most-expensive-lesson-of-my-life-details-of-sim-port-hack-35de11517124)
Read more:
This is how you can protect your cryptocurrencies from hackers (https://www.cnbc.com/2017/11/02/heres-how-to-protect-your-bitcoin-and-ethereum-from-hacking.html)

Not sure about 1.

On 2, yes there have been cases where this has been successful. Example: https://www.coindesk.com/crypto-investor-awarded-over-75-million-in-sim-swapping-hack-case


Also, we wrote an article for Binance that does touch on some other ways to protect yourself (https://www.binance.vision/security/common-scams-on-mobile-devices)

For the number of hacks that have occurred over the years in the cryptocurrency space, it baffles me how much people still like to leave their funds on exchanges and custodial wallets; and take note that we're talking about $100,000 in this case. Heck, I'm not even comfortable in leaving $200 on an exchange.

It's possible, but this method typically requires you to share private information to verify the caller's identity. If you've been sloppy with your privacy, gotten phished, etc., you could be vulnerable to this. Additionally, there have been instances (https://www.ccn.com/2-4-million-crypto-sim-hijacking-heist-hackers-bribe) where hackers have people on the inside of the telecommunications company helping them pull off the attack.

So yeah, you should not be relying on SMS authentication to protect significant amounts (I mean, it's still better than no other protection at all), regardless of carrier.

In my country, there is none AFAIK. You need to go to their local center, bring your ID and related materials that can proof you're the owner of that number before you can port a new sim. But this doesn't mean there is no risk.

I guess the only possible way to hack this is if a hacker found a way to edit and replicate the national ID of the target. In short, you should protect your private information as strong as you could, don't ever leak any info online, and never expose to others that you own cryptocurrency.

You should not use SMS text messages as a 2FA to access your exchange accounts. Even if you do not keep any money on an exchange, if someone successfully takes over your cell phone number, and can learn your password, or access your email account, they can drain your linked bank account, or max out your credit card associated with/linked to your Coinbase/exchange account.

Google authenticator is far superior in terms of 2FA. In laymens terms, it uses a private key plus the current time to calculate a code good for a limited time. As long as your physical device is kept secure, and malware free, an attacker will be unable to obtain the private key to calculate the 2FA codes.

It's the most advance way of hack that I read, very new to me and I don't even think it's possible.
I avoided downloading files online using my phone to prevent from getting hack, but hackers now are getting smarter.

Thank you for giving such good information, really appreciate it, try to change some plans.

This attack has nothing to do with malware or downloading software. It is a social engineering attack that tricks your cell phone carrier into transferring your service to another phone so the attacker can receive your text messages.

Oh, it's really helpful that we should never disclose to anyone our personal information which is prone to use to impersonate you.

This thing is really dangerous which it is the first thought comes to my mind about this sim porting which can be done with "inside job" attack for every carrier network company.

Same here, Since I am a trader, I even withdraw my funds in exchange when I about to go for a long vacation or out of town trip.

Google authenticator > SMS authenticator. But there are some website that doesn't support google authenticator, that's the bad thing about that.

Last month I came across a similar case (see  California Jails Student for 10 Years for $7.5 Million SIM-Swap Bitcoin Hack (https://www.ccn.com/bitcoin-hacker-10-years-jail-7-5-million-sim-swap)). The events took place in 2018 (mostly during the Concencus event), and involve at least 40 victims, many high-tech crypto profiles, but the court sentence came through recently. And this was in the US …

If somebody can commit such an attack only via phone call then this is a major security breach of the provider. Such a thing should not be possible, because today is not so difficult to get some data about someone, and then over the phone steal the identity of that person. Only proper way for such actions is personal visit to store and proof of identity there. This also can be abused if attacker is have your fake ID, but I think it's still too much risk for them to walk in store and to be captured on security cameras.

Bottom line in this story is that users should avoid to use mobile numbers / SIM for extra security of crypto related accounts, this proved to be very ineffective and in some cases resulted in huge financial losses.

I will like to reply all you guys that are saying it is identity breach or it major security flaw in provider service.

Let me explain you how the provider services generally work in USA.

In USA every individual have Social Security Number (SSN) it is 10 digit number and confidentiality of this number need to be maintained.
In some  case where you were asked of SSN, then it is the last 4 digit of SSN (instead of full 10).

So phone providers in US verify you by asking your name, DOB and last 4 digit of SSN. If you made this call in public, somebody can easily eavesdrop this data. By your name and DOB it will be very easy to find the phone number.

So anybody who has eavesdropped you can successfully do this attack without having any kind of your physical  identity.

(This is IMHO based on my experience  though I never did simport but successfully  closed phone numbers and started new number by just a phone call.)

imo it's a security flaw in the the sim card replacement procedure,
a simple confirmation call from provider to old sim card should help mitigate this attack
if this can't be done, then it requires "a personal visit to store and proof of identity" like Lucius said

This is a major security issue, and I'm sorry to hear you lost so much that must be devastating.

In my country you hear of phone companies saying that a phone number was never meant to be used as a security checking device, and so they are of the view that while they have (basic) security procedures in place, they are not responsible if taking your phone number results in a breach of your broader accounts attached to your phone. They will take responsibility for costs incurred relating to the phone specifically (like making a bunch of overseas calls) but not something like coins, emails or other personal information attached to your account.

I hope there is some recourse for you through the phone companies or maybe even insurance.

Your solution is still flawed because it requires all employees of a carrier to not be corrupt, and to follow policy to the "t".

A store employee can write down they checked ID, but checking a box in a computer does not guarantee this happened. This would also create many negative experiences for customers who do not live near their phone carrier's store locations.

Isn't that alarming or dangerous since you can do it by just a phone call.
However, its should be come first responsibility of the owner of phone number how they can protect their phone number or privacy, such their personal information.

are we, in this thread, talking about sim port attack or a corrupt employee commits a crime?
internal review and investigation will reveal this employee as a perp or an accomplice or simply negligence

I'm not sure how it works in your country, but we have to sign paperwork to request for sim card replacement
if the employee also falsify this paperwork then he's commiting another crime... this no longer a simple sim port attack

you said it yourself, "it is a social engineering attack that tricks your cell phone carrier"
when you talk about corrupt employee and such, you strayed from the discussion about sim port attack

I would consider a corrupt employee one mode of completing a Sim Port attack. The end result is still the same, that is a third party can control a person's cell phone number and receive calls/texts to that number, that is not authorized to do so.

If a single employee helps with Sim Port attacks many times, the carrier's internal controls should detect this. If an employee, or a manager over a group of employees helps with a Sim Port attack a small number of times infrequently, it would be more difficult to detect. 

No one should be putting any aspect of their online security in the hands of a phone company. Social engineering is a very, very powerful thing.

Think it over. You're placing your wealth or poverty in the hands of some bored shitless call centre worker on $10 an hour who barely registers what people say to them any more and wouldn't care if a million customers dropped dead tomorrow. Would you class that person as worthy of deciding the course of your entire future?

The tools are out there to completely shut this particular route to disaster down. Use them.

Yeah I understand, thanks for clarifying it.

So this is riskier than downloading files in the internet, this one, even if you are online, you can still be victim of hack.
As I have stated, what I only avoid is downloading files online but don't know it's still possible to get hack with the new way of hack shared by OP.

They should be, but they heavily rely on last 4 digit of SSN. If your last 4 digit of SSN become public a lot of  attacks like (sim port), I guess can be successfully launched.

If by chance , if your all 10 digit of SSN are known, then somebody will able to take the bank loan on it. (Again no physical identity paper (SSN) required.

You can avoid the effects of this attack by not using your phone number (receiving a phone call or SMS message) as a means to unlock any financial account. Not as a second factor, and not as a means to reset your password.

Sim swaps in my country happens very often, because there are criminal syndicates working within the mobile network providers that are doing these illegal Sim swaps. I also know about incidents where employees were blackmailed to help these criminals to swap some of these Sim cards. <They find employees weak points and they exploit it>  >:(

A friend of mine had his whole Bank account swept, because someone within the Bank, worked with these syndicates to hijack his mobile phone and to clone his ATM card. <They swamped him with telephone calls at night and was forced to switch off his phone, so he missed all the notification to his phone that they were drawing money from his account.>  >:( >:( >:(

Just some update here:


https://www.zdnet.com/article/trickbot-todays-top-trojan-adds-feature-to-aid-sim-swapping-attacks/

Really scary how these cyber criminals are evolving.

https://i.ibb.co/SfW3Vhn/Screen-Shot-2019-08-29-at-7-46-27-PM.png (https://ibb.co/LNbZ9Lt)

Aside of this complicated kind of attack, these are in general pretty basic rules of crypto security.
Storing on centralized exchange is biggest mistakes people can make in crypto world.
I would add to that list also paper wallet as cheaper  (free) way of storing crypto. Hardware wallets cost from $20-$100.[/list]

And then they say that it's crypto where people lose their money. I'm sure most people here will be blaming crypto alone without even understanding that in this case, the subsistence of services provided by these carriers is to be blamed because their system itself comes under the fault as they allow people to swap their Sim cards with minimum info needed. I can understand that their major concern is to give their customers with quick resolutions but this is where they compromise with their security as well. This incident shows that nothing should be trusted (even your phone number). The person who lost $100k shouldn't have used phone or SMS verification in 2fa at the first place, they must have gone for Google's 2fa).

I have recently removed my mobile number from accounts like gmail, because of the risk that sim swap can be executed against me. It's a weird case when a security measure can make you less secure, instead of at least being just useless. I just can't trust that greedy mobile operators from my country won't sell my number to hackers for a bribe, or hire staff competent enough to recognize hacker's attempts to hijack a number.

Twitter CEO Jack Dorsey recently has his twitter account hacked via what appears to be a SIM port attack in which someone was able to send many racist tweets on his behalf.

The above is the only details released by Twitter, and it is possible there is more to the story. This does show that anyone can be a victim of these types of attacks.

I was about to post this info as well but you beat me to it. Anyways, you are right even the CEO of Twitter was hack and it could be this method as well so no one is really safe from this online criminals.


https://www.bbc.com/news/technology-49532244

The hacker apparently was able to tweet via sending text messages from the number in question, making compromising the number the only thing needed to access the twitter account.

In theory, hackers might be able to spoof the number text messages are from in order to send tweets, which might make SIM porting the number unnecessary.

Twitter temporarily disables 'Tweeting via SMS' after CEO gets hacked


https://thehackernews.com/2019/09/tweet-via-sms-text-message-hacking.html

So it looks like they temporarily 'Tweeting via SMS", disable it after the Dorsey fiasco. Seems the least they can do right now to prevent such exploit in the future.

I have not noticed the feature to tweet via SMS. I always log in my Twitter account, and honestly I simply read others' tweets. In my nation, there is very limited proportion of Tweeters, so I join Twitter mainly because powerful guys prefer to use Twitter to spread their important news, perspectives, analyses, etc. fastly.

The hack demonstrates that activate 2FA security for accounts is important, not only with Twitter, but also with Facebook, Instagram, exchanges, casinos.

Twitter previously said they had kept the feature available because some parts of the word have very expensive internet/data and twitter wanted to keep the availability of tweeting to as wide of population as possible.

At a minimum, Twitter should reply to SMS tweets with a request to enter a password, but ideally, someone would need to send a time based code that is good for perhaps several minutes to an hour each time they want to SMS tweet.

I found an article about cases on sim port attack, but this article was on June 2019. But it is said that most of the victims or almost compromised are into cryptocurrency, check here: Wave of SIM swapping attacks hit US cryptocurrency users (https://www.zdnet.com/article/wave-of-sim-swapping-attacks-hit-us-cryptocurrency-users/).
And it was stated by one of the detective about this case, possible 3 ways:

Today I read another news related with SIM attack, Called WIB (Wireless Internet Browser) attack.

This is explanation about WIBAttack



Read full articles and explanation here: https://ginnoslab.org/2019/09/21/wibattack-vulnerability-in-wib-sim-browser-can-let-attackers-globally-take-control-of-hundreds-of-millions-of-the-victim-mobile-phones-worldwide-to-make-a-phone-call-send-sms-to-any-phone-numbers/

Demo how attacker sending SMS from same number to get a victim can be found at articles. or you can check this video directly (https://www.youtube.com/watch?v=oZEjw6lOuhY)

BUMP!

yes, i worked with a telecommunication company 2 years back. there were issues like this and it is a frequent re-occurrence. scammers do connived with bank staffs to swap sim cards of rich persons. after which they(scammers) contact the telecommunication for sim swap. such occurrence which requires a proper check up by the telecommunications due get outsmarted after series of check by the telecommunication.

For sure that is already have been thinking or tried by some telecommunication providers, but they should also think some of the parts where their customers will easy to swap their sim cards in a legit way, that's why this Sim Port Attack is started to spread.
For me, the best way to do is actual sim swapping per customers, like the customer is allowed to go in some branch or office of their telco, but this is kinda not comfortable for the side of the customer.

If I may just bump this thread,

https://www.bleepingcomputer.com/news/security/scammers-drain-bank-accounts-using-anydesk-and-sim-swapping/


Dangerous combination, social engineering + SIM Swap = lost of money to the victims.

I just have one question about this sim port attack. In order for anyone to hijack my SIM, he needs to be present in my local area and it can't be done outside the country. Is it so?

For example, In my country, we have JAZZ, WARID, and Ufone mobile operators and since these networks are available locally, it is not possible for anyone to port my sim internationally and get the codes/SMS etc. ?

The attacker would need to have assistance from someone who has the ability to update your mobile phone account with a new SIM card. This means the attacker can be in any location. Some mobile phone operators have employees based in other countries than where they operate.